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How to increase the volume of a metronome?

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  How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-13 15:28 +0000
    Re: How to increase the volume of a metronome? Tim Wescott <tim@seemywebsite.com> - 2017-02-13 11:15 -0600
      Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-13 19:28 +0000
    Re: How to increase the volume of a metronome? Don Y <blockedofcourse@foo.invalid> - 2017-02-13 11:21 -0700
      Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-13 19:28 +0000
        Re: How to increase the volume of a metronome? Don Y <blockedofcourse@foo.invalid> - 2017-02-13 13:00 -0700
    Re: How to increase the volume of a metronome? bitrex <bitrex@de.lete.earthlink.net> - 2017-02-13 13:42 -0500
      Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-13 19:58 +0000
    Re: How to increase the volume of a metronome? Tim Wescott <seemywebsite@myfooter.really> - 2017-02-13 12:43 -0600
      Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-13 19:47 +0000
      Re: How to increase the volume of a metronome? bitrex <bitrex@de.lete.earthlink.net> - 2017-02-13 18:05 -0500
    Re: How to increase the volume of a metronome? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-02-13 21:30 +0200
      Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-13 19:54 +0000
        Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-23 05:54 +0000
          Re: How to increase the volume of a metronome? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2017-02-23 16:43 +0200
            Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-23 15:23 +0000
              Re: How to increase the volume of a metronome? tabbypurr@gmail.com - 2017-02-23 16:29 -0800
                Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-24 02:15 +0000
                  Re: How to increase the volume of a metronome? tabbypurr@gmail.com - 2017-02-24 01:49 -0800
                    Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-24 14:56 +0000
                      Re: How to increase the volume of a metronome? tabbypurr@gmail.com - 2017-02-24 07:21 -0800
                      Re: How to increase the volume of a metronome? rickman <gnuarm@gmail.com> - 2017-02-24 14:11 -0500
                        Re: How to increase the volume of a metronome? rickman <gnuarm@gmail.com> - 2017-02-24 15:28 -0500
                        Re: How to increase the volume of a metronome? tabbypurr@gmail.com - 2017-02-24 12:37 -0800
                          Re: How to increase the volume of a metronome? rickman <gnuarm@gmail.com> - 2017-02-24 15:46 -0500
                            Re: How to increase the volume of a metronome? tabbypurr@gmail.com - 2017-02-24 13:23 -0800
                              Re: How to increase the volume of a metronome? rickman <gnuarm@gmail.com> - 2017-02-24 17:49 -0500
                                Re: How to increase the volume of a metronome? Don Kuenz <g@crcomp.net> - 2017-02-25 03:43 +0000
                                  Re: How to increase the volume of a metronome? tabbypurr@gmail.com - 2017-02-24 23:03 -0800
                                  Re: How to increase the volume of a metronome? rickman <gnuarm@gmail.com> - 2017-02-25 03:20 -0500
    Re: How to increase the volume of a metronome? Jasen Betts <jasen@xnet.co.nz> - 2017-02-15 11:11 +0000

Page 1 of 2  [1] 2  Next page →

#447552 — How to increase the volume of a metronome?

Greetings,

Comments are sought on additional circuitry to increase the speaker
volume of the circuit shown between the lines. Comments on circuit
simplifications are also sought. (Maybe a 555 with a couple of pots is
as simple as it gets sometimes?)

The Tempo1/Tempo2 resistor pair signifies a pot as does the Vol1/Vol2
pair. Is there a better way to capture pots with LTSpice?

----------------------------------------------------------------------

Version 4
SHEET 1 960 936
WIRE -384 96 -512 96
WIRE -288 96 -384 96
WIRE 64 96 -288 96
WIRE 112 96 64 96
WIRE 304 96 112 96
WIRE 112 112 112 96
WIRE -384 128 -384 96
WIRE -288 192 -288 96
WIRE -240 192 -288 192
WIRE 112 192 112 176
WIRE 112 192 -16 192
WIRE 112 224 112 192
WIRE -384 256 -384 208
WIRE -240 256 -384 256
WIRE 16 256 -16 256
WIRE -384 304 -384 256
WIRE -240 320 -320 320
WIRE 176 320 -16 320
WIRE 176 336 176 320
WIRE 304 368 304 96
WIRE -240 384 -288 384
WIRE 64 384 64 96
WIRE 64 384 -16 384
WIRE 240 416 176 416
WIRE -384 448 -384 384
WIRE -320 448 -320 320
WIRE -320 448 -384 448
WIRE 16 448 16 256
WIRE 16 448 -320 448
WIRE -512 464 -512 96
WIRE -384 480 -384 448
WIRE -288 480 -288 384
WIRE 304 496 304 464
WIRE 176 512 176 496
WIRE -512 592 -512 544
WIRE -384 592 -384 544
WIRE -384 592 -512 592
WIRE -288 592 -288 544
WIRE -288 592 -384 592
WIRE 304 592 304 576
WIRE -512 640 -512 592
FLAG -512 640 0
FLAG 112 224 0
FLAG 176 512 0
FLAG 304 592 0
SYMBOL Misc\\NE555 -128 288 M0
SYMATTR InstName U1
SYMBOL res -368 112 M0
SYMATTR InstName Tempo1
SYMATTR Value 125k
SYMBOL res -368 288 M0
WINDOW 0 36 43 Left 2
WINDOW 3 49 74 Left 2
SYMATTR InstName Tempo2
SYMATTR Value 125k
SYMBOL cap -368 480 M0
WINDOW 0 -23 6 Left 2
WINDOW 3 -41 58 Left 2
SYMATTR InstName C2
SYMATTR Value 2.2\xc2\xb5F
SYMBOL res 160 320 R0
WINDOW 0 -92 42 Left 2
WINDOW 3 -88 69 Left 2
SYMATTR InstName Vol1
SYMATTR Value 500
SYMBOL Misc\\battery -512 448 R0
WINDOW 0 12 95 Left 2
WINDOW 3 17 9 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 9
SYMBOL cap -304 480 R0
SYMATTR InstName C3
SYMATTR Value 0.1nF
SYMBOL cap 96 112 R0
SYMATTR InstName C4
SYMATTR Value 100\xc2\xb5F
SYMBOL res 160 400 R0
WINDOW 0 -86 47 Left 2
WINDOW 3 -87 76 Left 2
SYMATTR InstName Vol2
SYMATTR Value 500
SYMBOL npn 240 368 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL res 288 480 R0
SYMATTR InstName Speaker
SYMATTR Value 8
TEXT -392 616 Right 2 !.tran 1 uic
TEXT -8 176 Left 2 ;1
TEXT -8 240 Left 2 ;2
TEXT -8 304 Left 2 ;3
TEXT -8 360 Left 2 ;4
TEXT -296 368 Left 2 ;5
TEXT -296 304 Left 2 ;6
TEXT -296 240 Left 2 ;7
TEXT -296 176 Left 2 ;8

----------------------------------------------------------------------

Thank you,

--
Don Kuenz KB7RPU

Nations are destroyed, or flourish, in proportion as the poetry,
painting, and music are destroyed or flourish! - William Blake

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#447569

On Mon, 13 Feb 2017 15:28:06 +0000, Don Kuenz wrote:

> Greetings,
> 
> Comments are sought on additional circuitry to increase the speaker
> volume of the circuit shown between the lines. Comments on circuit
> simplifications are also sought. (Maybe a 555 with a couple of pots is
> as simple as it gets sometimes?)
> 
> The Tempo1/Tempo2 resistor pair signifies a pot as does the Vol1/Vol2
> pair. Is there a better way to capture pots with LTSpice?

I'm not going to look at your schematic because the first answer is "just 
follow it with an audio amplifier", the second answer is "and a speaker 
that can handle the power", and your answer to that is "I don't want to 
buy that much speaker".

I'd build a sounder that bangs a tin can with a solenoid.  Should give 
you a healthy "thump".

-- 
Tim Wescott
Control systems, embedded software and circuit design
I'm looking for work!  See my website if you're interested
http://www.wescottdesign.com

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#447579

Tim Wescott <tim@seemywebsite.com> wrote:
> On Mon, 13 Feb 2017 15:28:06 +0000, Don Kuenz wrote:
>
>> Greetings,
>>
>> Comments are sought on additional circuitry to increase the speaker
>> volume of the circuit shown between the lines. Comments on circuit
>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>> as simple as it gets sometimes?)
>>
>> The Tempo1/Tempo2 resistor pair signifies a pot as does the Vol1/Vol2
>> pair. Is there a better way to capture pots with LTSpice?
>
> I'm not going to look at your schematic because the first answer is "just
> follow it with an audio amplifier", the second answer is "and a speaker
> that can handle the power", and your answer to that is "I don't want to
> buy that much speaker".
>
> I'd build a sounder that bangs a tin can with a solenoid.  Should give
> you a healthy "thump".

Speakers are not a problem. There's plenty of high quality speakers
available in my bone pile.

My problem is solenoids. Although there's plenty of solenoid coils in
the bone pile, there's nary a solenoid en total. :(

At any rate, a solenoid's the way to go. Because it also "warms up" the
timbre.

Thank you,

--
Don Kuenz KB7RPU

Music above all, and for this
Choose the irregular.
  - Paul Verlaine

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#447572

On 2/13/2017 8:28 AM, Don Kuenz wrote:
> Greetings,
>
> Comments are sought on additional circuitry to increase the speaker
> volume of the circuit shown between the lines. Comments on circuit
> simplifications are also sought. (Maybe a 555 with a couple of pots is
> as simple as it gets sometimes?)

Get a "knocker" out of a "classic" pinball machine.  Drive the coil
from a suitably adjustable timebase (whether that's an astable multivibrator
or an XTAL controlled oscillator/divider is your implementation choice).
Adjust the "volume" by threading a screw into the striker plate and
increasing/decreasing the "throw" to limit the amount of energy imparted
to the striker.

[This can be a really REALLY loud *thump* if so desired -- or, throttled back
to be a more abbreviated "tick".]

Downside is it won't be battery powered!  :-/

> The Tempo1/Tempo2 resistor pair signifies a pot as does the Vol1/Vol2
> pair. Is there a better way to capture pots with LTSpice?

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#447580

Don Y <blockedofcourse@foo.invalid> wrote:
> On 2/13/2017 8:28 AM, Don Kuenz wrote:
>> Greetings,
>>
>> Comments are sought on additional circuitry to increase the speaker
>> volume of the circuit shown between the lines. Comments on circuit
>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>> as simple as it gets sometimes?)
>
> Get a "knocker" out of a "classic" pinball machine.  Drive the coil
> from a suitably adjustable timebase (whether that's an astable multivibrator
> or an XTAL controlled oscillator/divider is your implementation choice).
> Adjust the "volume" by threading a screw into the striker plate and
> increasing/decreasing the "throw" to limit the amount of energy imparted
> to the striker.
>
> [This can be a really REALLY loud *thump* if so desired -- or, throttled back
> to be a more abbreviated "tick".]
>
> Downside is it won't be battery powered!  :-/

The battery was always iffy from the get go. While the wall wart just
bided its time.

A pinball "knocker"'s the answer. It provides a warm timbre in a handy
little package. Unfortunately it's likely to be the most expensive part
of my metronome by far, now that it's "rare."

There were pinball machines at my local dump for the taking a couple
of years ago. But trash apparently ripens into rare treasure. Now
there's "No Scavenging!" signage plastered all over the place.

Thank you,

--
Don Kuenz KB7RPU

The man that hath no music in himself,
Nor is not mov'd with concord of sweet sounds,
Is fit for treasons, stratagems, and spoils;
The motions of his spirit are dull as night,
And his affections dark as Erebus:
Let no such man be trusted.
  - Shakespeare

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#447585

On 2/13/2017 12:28 PM, Don Kuenz wrote:
> The battery was always iffy from the get go. While the wall wart just
> bided its time.
>
> A pinball "knocker"'s the answer. It provides a warm timbre in a handy
> little package.

Of course!  It mimics the mechanical sound you are trying to electronically
reproduce.

The "enclosure" can make a big difference in the "quality" of the sound.
If you go this route, take some time to experiment with that aspect of
the "design".  You can also modify the striker/striking surface to
change the character of the sound (experiment with soft rubber/plastic
"bumpers")

> Unfortunately it's likely to be the most expensive part
> of my metronome by far, now that it's "rare."

Note that you needn't use a knocker, /per se/.  Any of the solenoids from
a pintable can be adapted -- though the knocker has the advantage of a
readymade "package" (and doesn't have other "ancillary" sounds/jangles
associated with its mechanism).

The solenoid from any of the "bells" would also be an easy modification.

> There were pinball machines at my local dump for the taking a couple
> of years ago. But trash apparently ripens into rare treasure. Now
> there's "No Scavenging!" signage plastered all over the place.

Look in your local yellow pages for "Amusement Devices" or "Vending
(Machines)".  Chances are, you have at least one storefront that addresses
this market (even in towns of a few thousand population!).

If they don't have the item "stocked", ask for the names of any of the
"Operators"/"Route men" in town (these are the guys who service the
jukebox/vending/arcade machines located in the bars, bowling alleys,
prisons, "private clubs" (BPOE, IPC, PPC, etc.) in town -- each might
have only one or two "machines" and hence not have a "staff" to address
their needs (unlike a full-fledged "arcade").

You might get lucky and find a guy who will sell you one "off his truck"
while standing in the parking lot outside the bowling alley, etc.

The advantage they have is that not a lot can go wrong that can't
be verified with an ohmeter prior to sale!

Good luck!

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#447577

On 02/13/2017 10:28 AM, Don Kuenz wrote:
> Greetings,
>
> Comments are sought on additional circuitry to increase the speaker
> volume of the circuit shown between the lines. Comments on circuit
> simplifications are also sought. (Maybe a 555 with a couple of pots is
> as simple as it gets sometimes?)

You can't drive an 8 ohm speaker from the emitter of a 2N3904 like that 
- it only has a low output impedance for small signals, and the drive 
current available is not symmetric.

Either use a small impedance matching transformer in the collector lead 
(like 2k-8 ohms maybe) with a 0.1uF cap in parallel with the primary, or 
use the 555 output to drive a proper complimentary BJT pair power 
driver. Or just use a small audio output driver IC to drive the speaker, 
like the LM386 - the output automatically biases to around half the 
single supply and you can block it from the speaker with an 
appropriately-sized cap.

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#447584

bitrex <bitrex@de.lete.earthlink.net> wrote:
> On 02/13/2017 10:28 AM, Don Kuenz wrote:
>> Greetings,
>>
>> Comments are sought on additional circuitry to increase the speaker
>> volume of the circuit shown between the lines. Comments on circuit
>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>> as simple as it gets sometimes?)
>
> You can't drive an 8 ohm speaker from the emitter of a 2N3904 like that
> - it only has a low output impedance for small signals, and the drive
> current available is not symmetric.
>
> Either use a small impedance matching transformer in the collector lead
> (like 2k-8 ohms maybe) with a 0.1uF cap in parallel with the primary, or
> use the 555 output to drive a proper complimentary BJT pair power
> driver. Or just use a small audio output driver IC to drive the speaker,
> like the LM386 - the output automatically biases to around half the
> single supply and you can block it from the speaker with an
> appropriately-sized cap.

The LM386 looks like a winner to me, provided that Tim's "narrow pulse"
makes the timbre sound warm enough.

Thank you,

--
Don Kuenz KB7RPU

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#447578

On Mon, 13 Feb 2017 15:28:06 +0000, Don Kuenz wrote:

> Greetings,
> 
> Comments are sought on additional circuitry to increase the speaker
> volume of the circuit shown between the lines. Comments on circuit
> simplifications are also sought. (Maybe a 555 with a couple of pots is
> as simple as it gets sometimes?)
> 
> The Tempo1/Tempo2 resistor pair signifies a pot as does the Vol1/Vol2
> pair. Is there a better way to capture pots with LTSpice?
> 

Your newsreader has mangled the file by taking out the linefeeds -- I was 
going to take a second look, but I'd have to slave over it to 
reconstitute.

At any rate, from experience: you want lots of high frequency content to 
get a "tick" instead of a "thump".  If you're using a speaker this means 
delivering a very narrow impulse to the speaker, and using a speaker that 
has good high-frequency characteristics.  Fortunately, it also means that 
you don't need an amplifier in the classic sense -- you can have a simple 
one-transistor "pull it down hard and let go" amplifier, or a slightly 
less simple class B pair, and don't worry about crossover distortion.

I'd handle volume either by changing the final stage final voltage, or by 
modulating the length of the (very narrow!) pulse I send to the final 
stage.  The second method will change the frequency content -- as it gets 
louder it'll be more of a "thud" than a "tick", but try it, you might 
like it.

-- 

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

I'm looking for work -- see my website!

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#447582

Tim Wescott <seemywebsite@myfooter.really> wrote:
> On Mon, 13 Feb 2017 15:28:06 +0000, Don Kuenz wrote:
>
>> Greetings,
>>
>> Comments are sought on additional circuitry to increase the speaker
>> volume of the circuit shown between the lines. Comments on circuit
>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>> as simple as it gets sometimes?)
>>
>> The Tempo1/Tempo2 resistor pair signifies a pot as does the Vol1/Vol2
>> pair. Is there a better way to capture pots with LTSpice?
>>
>
> Your newsreader has mangled the file by taking out the linefeeds -- I was
> going to take a second look, but I'd have to slave over it to
> reconstitute.
>
> At any rate, from experience: you want lots of high frequency content to
> get a "tick" instead of a "thump".  If you're using a speaker this means
> delivering a very narrow impulse to the speaker, and using a speaker that
> has good high-frequency characteristics.  Fortunately, it also means that
> you don't need an amplifier in the classic sense -- you can have a simple
> one-transistor "pull it down hard and let go" amplifier, or a slightly
> less simple class B pair, and don't worry about crossover distortion.
>
> I'd handle volume either by changing the final stage final voltage, or by
> modulating the length of the (very narrow!) pulse I send to the final
> stage.  The second method will change the frequency content -- as it gets
> louder it'll be more of a "thud" than a "tick", but try it, you might
> like it.

Let's see if linefeeds "Windows style" works this time:

------------------------------------------------------------------------

Version 4^M
SHEET 1 960 936^M
WIRE -384 96 -512 96^M
WIRE -288 96 -384 96^M
WIRE 64 96 -288 96^M
WIRE 112 96 64 96^M
WIRE 304 96 112 96^M
WIRE 112 112 112 96^M
WIRE -384 128 -384 96^M
WIRE -288 192 -288 96^M
WIRE -240 192 -288 192^M
WIRE 112 192 112 176^M
WIRE 112 192 -16 192^M
WIRE 112 224 112 192^M
WIRE -384 256 -384 208^M
WIRE -240 256 -384 256^M
WIRE 16 256 -16 256^M
WIRE -384 304 -384 256^M
WIRE -240 320 -320 320^M
WIRE 176 320 -16 320^M
WIRE 176 336 176 320^M
WIRE 304 368 304 96^M
WIRE -240 384 -288 384^M
WIRE 64 384 64 96^M
WIRE 64 384 -16 384^M
WIRE 240 416 176 416^M
WIRE -384 448 -384 384^M
WIRE -320 448 -320 320^M
WIRE -320 448 -384 448^M
WIRE 16 448 16 256^M
WIRE 16 448 -320 448^M
WIRE -512 464 -512 96^M
WIRE -384 480 -384 448^M
WIRE -288 480 -288 384^M
WIRE 304 496 304 464^M
WIRE 176 512 176 496^M
WIRE -512 592 -512 544^M
WIRE -384 592 -384 544^M
WIRE -384 592 -512 592^M
WIRE -288 592 -288 544^M
WIRE -288 592 -384 592^M
WIRE 304 592 304 576^M
WIRE -512 640 -512 592^M
FLAG -512 640 0^M
FLAG 112 224 0^M
FLAG 176 512 0^M
FLAG 304 592 0^M
SYMBOL Misc\\NE555 -128 288 M0^M
SYMATTR InstName U1^M
SYMBOL res -368 112 M0^M
SYMATTR InstName Tempo1^M
SYMATTR Value 125k^M
SYMBOL res -368 288 M0^M
WINDOW 0 36 43 Left 2^M
WINDOW 3 49 74 Left 2^M
SYMATTR InstName Tempo2^M
SYMATTR Value 125k^M
SYMBOL cap -368 480 M0^M
WINDOW 0 -23 6 Left 2^M
WINDOW 3 -41 58 Left 2^M
SYMATTR InstName C2^M
SYMATTR Value 2.2\xb5F^M
SYMBOL res 160 320 R0^M
WINDOW 0 -92 42 Left 2^M
WINDOW 3 -88 69 Left 2^M
SYMATTR InstName Vol1^M
SYMATTR Value 500^M
SYMBOL Misc\\battery -512 448 R0^M
WINDOW 0 12 95 Left 2^M
WINDOW 3 17 9 Left 2^M
WINDOW 123 0 0 Left 2^M
WINDOW 39 0 0 Left 2^M
SYMATTR InstName V1^M
SYMATTR Value 9^M
SYMBOL cap -304 480 R0^M
SYMATTR InstName C3^M
SYMATTR Value 0.1nF^M
SYMBOL cap 96 112 R0^M
SYMATTR InstName C4^M
SYMATTR Value 100\xb5F^M
SYMBOL res 160 400 R0^M
WINDOW 0 -86 47 Left 2^M
WINDOW 3 -87 76 Left 2^M
SYMATTR InstName Vol2^M
SYMATTR Value 500^M
SYMBOL npn 240 368 R0^M
SYMATTR InstName Q1^M
SYMATTR Value 2N3904^M
SYMBOL res 288 480 R0^M
SYMATTR InstName Speaker^M
SYMATTR Value 8^M
TEXT -392 616 Right 2 !.tran 1 uic^M
TEXT -8 176 Left 2 ;1^M
TEXT -8 240 Left 2 ;2^M
TEXT -8 304 Left 2 ;3^M
TEXT -8 360 Left 2 ;4^M
TEXT -296 368 Left 2 ;5^M
TEXT -296 304 Left 2 ;6^M
TEXT -296 240 Left 2 ;7^M
TEXT -296 176 Left 2 ;8^M

------------------------------------------------------------------------

Thank you,

--
Don Kuenz KB7RPU

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#447599

On 02/13/2017 01:43 PM, Tim Wescott wrote:
> On Mon, 13 Feb 2017 15:28:06 +0000, Don Kuenz wrote:
>
>> Greetings,
>>
>> Comments are sought on additional circuitry to increase the speaker
>> volume of the circuit shown between the lines. Comments on circuit
>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>> as simple as it gets sometimes?)
>>
>> The Tempo1/Tempo2 resistor pair signifies a pot as does the Vol1/Vol2
>> pair. Is there a better way to capture pots with LTSpice?
>>
>
> Your newsreader has mangled the file by taking out the linefeeds -- I was
> going to take a second look, but I'd have to slave over it to
> reconstitute.
>
> At any rate, from experience: you want lots of high frequency content to
> get a "tick" instead of a "thump".  If you're using a speaker this means
> delivering a very narrow impulse to the speaker, and using a speaker that
> has good high-frequency characteristics.  Fortunately, it also means that
> you don't need an amplifier in the classic sense -- you can have a simple
> one-transistor "pull it down hard and let go" amplifier, or a slightly
> less simple class B pair, and don't worry about crossover distortion.
>
> I'd handle volume either by changing the final stage final voltage, or by
> modulating the length of the (very narrow!) pulse I send to the final
> stage.  The second method will change the frequency content -- as it gets
> louder it'll be more of a "thud" than a "tick", but try it, you might
> like it.
>

Rim shot circuit!

<http://syntherjack.net/wp-content/uploads/2016/08/808_RS_schematics_from_manual_possible_mods.png>

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#447581

On 13.2.17 17:28, Don Kuenz wrote:
> Greetings,
>
> Comments are sought on additional circuitry to increase the speaker
> volume of the circuit shown between the lines. Comments on circuit
> simplifications are also sought. (Maybe a 555 with a couple of pots is
> as simple as it gets sometimes?)


The canonical response is LM386.

It is not sensible to drive a speaker with a
follower here, it will eat your battery in
no time, and the speaker does not like the
DC bias on it.

-- 

-TV

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#447583

Tauno Voipio <tauno.voipio@notused.fi.invalid> wrote:
> On 13.2.17 17:28, Don Kuenz wrote:
>> Greetings,
>> 
>> Comments are sought on additional circuitry to increase the speaker
>> volume of the circuit shown between the lines. Comments on circuit
>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>> as simple as it gets sometimes?)
>
> 
> The canonical response is LM386.
> 
> It is not sensible to drive a speaker with a
> follower here, it will eat your battery in
> no time, and the speaker does not like the
> DC bias on it.

Good call! You just exterminated the battery eater in my subconscience.

Thank you,

--
Don Kuenz KB7RPU

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#448927

Don Kuenz <g@crcomp.net> wrote:
>
> Tauno Voipio <tauno.voipio@notused.fi.invalid> wrote:
>> On 13.2.17 17:28, Don Kuenz wrote:
>>> Greetings,
>>>
>>> Comments are sought on additional circuitry to increase the speaker
>>> volume of the circuit shown between the lines. Comments on circuit
>>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>>> as simple as it gets sometimes?)
>>
>>
>> The canonical response is LM386.
>>
>> It is not sensible to drive a speaker with a
>> follower here, it will eat your battery in
>> no time, and the speaker does not like the
>> DC bias on it.
>
> Good call! You just exterminated the battery eater in my subconscience.

The LM386 connected to Realistic Minimus 0.3 Bookshelf Speaker [1]
sounds excellent. Although the tempo pot works "as is" my goal is to
fine tune the pot / C1 circuitry to 40 bpm in fully counterclockwise
position and 208 bpm fully clockwise position.

My latest LTSpice circuit is included after the Note. It pulls in two
additional LTSpice subcircuits.

The first subcircuit models an LM386. [2] To use the LM386 just unzip it
then drop the lm386.asy and LM386.lib files into the folder with the asc
file included after Note.

The second subcircuit models a loudspeaker. [3] To use it just unzip it
then drop the Midrange.asc, Tweeter.asc, Wolfer.asc, and Loudspeaker.lib
into the folder with the asc file. Another goal of mine is to remove the
explicit declaration of Loudspeaker.lib from the asc file.

Note.

1. http://www.ebay.com/itm/272541834843
2. http://www.eas.uccs.edu/~mwickert/ece3001/lecture_notes/LM386_support_files.zip
3. http://www.electro-tech-online.com/attachments/loudspeaker-zip.88991/

------------------------------------------------------------------------
Version 4^M
SHEET 1 960 936^M
WIRE -384 96 -512 96^M
WIRE -288 96 -384 96^M
WIRE 64 96 -288 96^M
WIRE 112 96 64 96^M
WIRE 512 96 112 96^M
WIRE 112 112 112 96^M
WIRE -384 128 -384 96^M
WIRE -288 192 -288 96^M
WIRE -240 192 -288 192^M
WIRE 112 192 112 176^M
WIRE 112 192 -16 192^M
WIRE 112 224 112 192^M
WIRE -384 256 -384 208^M
WIRE -240 256 -384 256^M
WIRE 16 256 -16 256^M
WIRE -384 304 -384 256^M
WIRE -240 320 -320 320^M
WIRE 176 320 -16 320^M
WIRE 176 336 176 320^M
WIRE -240 384 -288 384^M
WIRE 64 384 64 96^M
WIRE 64 384 -16 384^M
WIRE 352 384 320 384^M
WIRE 224 416 176 416^M
WIRE 352 416 288 416^M
WIRE 512 416 512 96^M
WIRE 512 416 480 416^M
WIRE -384 448 -384 384^M
WIRE -320 448 -320 320^M
WIRE -320 448 -384 448^M
WIRE 16 448 16 256^M
WIRE 16 448 -320 448^M
WIRE 320 448 320 384^M
WIRE 352 448 320 448^M
WIRE 512 448 480 448^M
WIRE 544 448 512 448^M
WIRE 720 448 608 448^M
WIRE -512 464 -512 96^M
WIRE -384 480 -384 448^M
WIRE -288 480 -288 384^M
WIRE 176 512 176 496^M
WIRE 320 512 320 448^M
WIRE 512 576 512 448^M
WIRE -512 592 -512 544^M
WIRE -384 592 -384 544^M
WIRE -384 592 -512 592^M
WIRE -288 592 -288 544^M
WIRE -288 592 -384 592^M
WIRE 720 624 720 448^M
WIRE -512 640 -512 592^M
WIRE 512 672 512 640^M
WIRE 512 768 512 752^M
WIRE 720 768 720 720^M
FLAG -512 640 0^M
FLAG 112 224 0^M
FLAG 176 512 0^M
FLAG 320 512 0^M
FLAG 512 768 0^M
FLAG 720 768 0^M
SYMBOL Misc\\NE555 -128 288 M0^M
SYMATTR InstName U1^M
SYMBOL res -368 112 M0^M
SYMATTR InstName Tempo1^M
SYMATTR Value 125k^M
SYMBOL res -368 288 M0^M
WINDOW 0 36 43 Left 2^M
WINDOW 3 49 74 Left 2^M
SYMATTR InstName Tempo2^M
SYMATTR Value 125k^M
SYMBOL res 160 320 R0^M
WINDOW 0 -92 42 Left 2^M
WINDOW 3 -88 69 Left 2^M
SYMATTR InstName Vol1^M
SYMATTR Value 500^M
SYMBOL Misc\\battery -512 448 R0^M
WINDOW 0 12 95 Left 2^M
WINDOW 3 17 9 Left 2^M
WINDOW 123 0 0 Left 2^M
WINDOW 39 0 0 Left 2^M
SYMATTR InstName V1^M
SYMATTR Value 9^M
SYMBOL cap -304 480 R0^M
SYMATTR InstName C2^M
SYMATTR Value 0.1nF^M
SYMBOL res 160 400 R0^M
WINDOW 0 -86 47 Left 2^M
WINDOW 3 -87 76 Left 2^M
SYMATTR InstName Vol2^M
SYMATTR Value 500^M
SYMBOL lm386 416 400 R0^M
SYMATTR InstName U2^M
SYMBOL polcap 96 112 R0^M
SYMATTR InstName C3^M
SYMATTR Value 100\xc2\xb5F^M
SYMATTR SpiceLine Rser=1^M
SYMBOL polcap 544 464 R270^M
WINDOW 0 32 32 VTop 2^M
WINDOW 3 0 32 VBottom 2^M
SYMATTR InstName C4^M
SYMATTR Value 250\xc2\xb5F^M
SYMATTR SpiceLine Rser=1^M
SYMBOL polcap -400 480 R0^M
SYMATTR InstName C1^M
SYMATTR Value 2.2\xc2\xb5F^M
SYMBOL polcap 496 576 R0^M
SYMATTR InstName C5^M
SYMATTR Value 0.05\xc2\xb5F^M
SYMBOL res 496 656 R0^M
SYMATTR InstName R1^M
SYMATTR Value 10^M
SYMBOL Woofer 720 672 R0^M
WINDOW 38 -32 28 Right 2^M
SYMATTR SpiceModel IB3858^M
SYMATTR InstName U3^M
SYMBOL polcap 224 432 R270^M
WINDOW 0 32 32 VTop 2^M
WINDOW 3 0 32 VBottom 2^M
SYMATTR InstName C6^M
SYMATTR Value 10\xc2\xb5F^M
TEXT -392 616 Right 2 !.tran 10 uic^M
TEXT -8 176 Left 2 ;1^M
TEXT -8 240 Left 2 ;2^M
TEXT -8 304 Left 2 ;3^M
TEXT -8 360 Left 2 ;4^M
TEXT -296 368 Left 2 ;5^M
TEXT -296 304 Left 2 ;6^M
TEXT -296 240 Left 2 ;7^M
TEXT -296 176 Left 2 ;8^M
TEXT 80 848 Left 2 !.lib Loudspeaker.lib^M
------------------------------------------------------------------------

Thank you,

--
Don Kuenz KB7RPU

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#448952

On 23.2.17 07:54, Don Kuenz wrote:
> Don Kuenz <g@crcomp.net> wrote:
>>
>> Tauno Voipio <tauno.voipio@notused.fi.invalid> wrote:
>>> On 13.2.17 17:28, Don Kuenz wrote:
>>>> Greetings,
>>>>
>>>> Comments are sought on additional circuitry to increase the speaker
>>>> volume of the circuit shown between the lines. Comments on circuit
>>>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>>>> as simple as it gets sometimes?)
>>>
>>>
>>> The canonical response is LM386.
>>>
>>> It is not sensible to drive a speaker with a
>>> follower here, it will eat your battery in
>>> no time, and the speaker does not like the
>>> DC bias on it.
>>
>> Good call! You just exterminated the battery eater in my subconscience.
>
> The LM386 connected to Realistic Minimus 0.3 Bookshelf Speaker [1]
> sounds excellent. Although the tempo pot works "as is" my goal is to
> fine tune the pot / C1 circuitry to 40 bpm in fully counterclockwise
> position and 208 bpm fully clockwise position.
>
> My latest LTSpice circuit is included after the Note. It pulls in two
> additional LTSpice subcircuits.
>
> The first subcircuit models an LM386. [2] To use the LM386 just unzip it
> then drop the lm386.asy and LM386.lib files into the folder with the asc
> file included after Note.
>
> The second subcircuit models a loudspeaker. [3] To use it just unzip it
> then drop the Midrange.asc, Tweeter.asc, Wolfer.asc, and Loudspeaker.lib
> into the folder with the asc file. Another goal of mine is to remove the
> explicit declaration of Loudspeaker.lib from the asc file.
>
> Note.
>
> 1. http://www.ebay.com/itm/272541834843
> 2. http://www.eas.uccs.edu/~mwickert/ece3001/lecture_notes/LM386_support_files.zip
> 3. http://www.electro-tech-online.com/attachments/loudspeaker-zip.88991/
>
> ------------------------------------------------------------------------
> Version 4^M
> SHEET 1 960 936^M
> WIRE -384 96 -512 96^M
> WIRE -288 96 -384 96^M
> WIRE 64 96 -288 96^M
> WIRE 112 96 64 96^M
> WIRE 512 96 112 96^M
> WIRE 112 112 112 96^M
> WIRE -384 128 -384 96^M
> WIRE -288 192 -288 96^M
> WIRE -240 192 -288 192^M
> WIRE 112 192 112 176^M
> WIRE 112 192 -16 192^M
> WIRE 112 224 112 192^M
> WIRE -384 256 -384 208^M
> WIRE -240 256 -384 256^M
> WIRE 16 256 -16 256^M
> WIRE -384 304 -384 256^M
> WIRE -240 320 -320 320^M
> WIRE 176 320 -16 320^M
> WIRE 176 336 176 320^M
> WIRE -240 384 -288 384^M
> WIRE 64 384 64 96^M
> WIRE 64 384 -16 384^M
> WIRE 352 384 320 384^M
> WIRE 224 416 176 416^M
> WIRE 352 416 288 416^M
> WIRE 512 416 512 96^M
> WIRE 512 416 480 416^M
> WIRE -384 448 -384 384^M
> WIRE -320 448 -320 320^M
> WIRE -320 448 -384 448^M
> WIRE 16 448 16 256^M
> WIRE 16 448 -320 448^M
> WIRE 320 448 320 384^M
> WIRE 352 448 320 448^M
> WIRE 512 448 480 448^M
> WIRE 544 448 512 448^M
> WIRE 720 448 608 448^M
> WIRE -512 464 -512 96^M
> WIRE -384 480 -384 448^M
> WIRE -288 480 -288 384^M
> WIRE 176 512 176 496^M
> WIRE 320 512 320 448^M
> WIRE 512 576 512 448^M
> WIRE -512 592 -512 544^M
> WIRE -384 592 -384 544^M
> WIRE -384 592 -512 592^M
> WIRE -288 592 -288 544^M
> WIRE -288 592 -384 592^M
> WIRE 720 624 720 448^M
> WIRE -512 640 -512 592^M
> WIRE 512 672 512 640^M
> WIRE 512 768 512 752^M
> WIRE 720 768 720 720^M
> FLAG -512 640 0^M
> FLAG 112 224 0^M
> FLAG 176 512 0^M
> FLAG 320 512 0^M
> FLAG 512 768 0^M
> FLAG 720 768 0^M
> SYMBOL Misc\\NE555 -128 288 M0^M
> SYMATTR InstName U1^M
> SYMBOL res -368 112 M0^M
> SYMATTR InstName Tempo1^M
> SYMATTR Value 125k^M
> SYMBOL res -368 288 M0^M
> WINDOW 0 36 43 Left 2^M
> WINDOW 3 49 74 Left 2^M
> SYMATTR InstName Tempo2^M
> SYMATTR Value 125k^M
> SYMBOL res 160 320 R0^M
> WINDOW 0 -92 42 Left 2^M
> WINDOW 3 -88 69 Left 2^M
> SYMATTR InstName Vol1^M
> SYMATTR Value 500^M
> SYMBOL Misc\\battery -512 448 R0^M
> WINDOW 0 12 95 Left 2^M
> WINDOW 3 17 9 Left 2^M
> WINDOW 123 0 0 Left 2^M
> WINDOW 39 0 0 Left 2^M
> SYMATTR InstName V1^M
> SYMATTR Value 9^M
> SYMBOL cap -304 480 R0^M
> SYMATTR InstName C2^M
> SYMATTR Value 0.1nF^M
> SYMBOL res 160 400 R0^M
> WINDOW 0 -86 47 Left 2^M
> WINDOW 3 -87 76 Left 2^M
> SYMATTR InstName Vol2^M
> SYMATTR Value 500^M
> SYMBOL lm386 416 400 R0^M
> SYMATTR InstName U2^M
> SYMBOL polcap 96 112 R0^M
> SYMATTR InstName C3^M
> SYMATTR Value 100\xc2\xb5F^M
> SYMATTR SpiceLine Rser=1^M
> SYMBOL polcap 544 464 R270^M
> WINDOW 0 32 32 VTop 2^M
> WINDOW 3 0 32 VBottom 2^M
> SYMATTR InstName C4^M
> SYMATTR Value 250\xc2\xb5F^M
> SYMATTR SpiceLine Rser=1^M
> SYMBOL polcap -400 480 R0^M
> SYMATTR InstName C1^M
> SYMATTR Value 2.2\xc2\xb5F^M
> SYMBOL polcap 496 576 R0^M
> SYMATTR InstName C5^M
> SYMATTR Value 0.05\xc2\xb5F^M
> SYMBOL res 496 656 R0^M
> SYMATTR InstName R1^M
> SYMATTR Value 10^M
> SYMBOL Woofer 720 672 R0^M
> WINDOW 38 -32 28 Right 2^M
> SYMATTR SpiceModel IB3858^M
> SYMATTR InstName U3^M
> SYMBOL polcap 224 432 R270^M
> WINDOW 0 32 32 VTop 2^M
> WINDOW 3 0 32 VBottom 2^M
> SYMATTR InstName C6^M
> SYMATTR Value 10\xc2\xb5F^M
> TEXT -392 616 Right 2 !.tran 10 uic^M
> TEXT -8 176 Left 2 ;1^M
> TEXT -8 240 Left 2 ;2^M
> TEXT -8 304 Left 2 ;3^M
> TEXT -8 360 Left 2 ;4^M
> TEXT -296 368 Left 2 ;5^M
> TEXT -296 304 Left 2 ;6^M
> TEXT -296 240 Left 2 ;7^M
> TEXT -296 176 Left 2 ;8^M
> TEXT 80 848 Left 2 !.lib Loudspeaker.lib^M
> ------------------------------------------------------------------------
>
> Thank you,
>
> --
> Don Kuenz KB7RPU
>

Thanks for the feedback.

Where did you get the symbols and models for LM386 and speaker?

-- 

Tauno Voipio OH2UG

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#448953

Tauno Voipio <tauno.voipio@notused.fi.invalid> wrote:
> On 23.2.17 07:54, Don Kuenz wrote:
>> Don Kuenz <g@crcomp.net> wrote:
>>>
>>> Tauno Voipio <tauno.voipio@notused.fi.invalid> wrote:
>>>> On 13.2.17 17:28, Don Kuenz wrote:
>>>>> Greetings,
>>>>>
>>>>> Comments are sought on additional circuitry to increase the speaker
>>>>> volume of the circuit shown between the lines. Comments on circuit
>>>>> simplifications are also sought. (Maybe a 555 with a couple of pots is
>>>>> as simple as it gets sometimes?)
>>>>
>>>>
>>>> The canonical response is LM386.
>>>>
>>>> It is not sensible to drive a speaker with a
>>>> follower here, it will eat your battery in
>>>> no time, and the speaker does not like the
>>>> DC bias on it.
>>>
>>> Good call! You just exterminated the battery eater in my subconscience.
>>
>> The LM386 connected to Realistic Minimus 0.3 Bookshelf Speaker [1]
>> sounds excellent. Although the tempo pot works "as is" my goal is to
>> fine tune the pot / C1 circuitry to 40 bpm in fully counterclockwise
>> position and 208 bpm fully clockwise position.
>>
>> My latest LTSpice circuit is included after the Note. It pulls in two
>> additional LTSpice subcircuits.
>>
>> The first subcircuit models an LM386. [2] To use the LM386 just unzip it
>> then drop the lm386.asy and LM386.lib files into the folder with the asc
>> file included after Note.
>>
>> The second subcircuit models a loudspeaker. [3] To use it just unzip it
>> then drop the Midrange.asc, Tweeter.asc, Wolfer.asc, and Loudspeaker.lib
>> into the folder with the asc file. Another goal of mine is to remove the
>> explicit declaration of Loudspeaker.lib from the asc file.
>>
>> Note.
>>
>> 1. http://www.ebay.com/itm/272541834843
>> 2. http://www.eas.uccs.edu/~mwickert/ece3001/lecture_notes/LM386_support_files.zip
>> 3. http://www.electro-tech-online.com/attachments/loudspeaker-zip.88991/
>>
>> ------------------------------------------------------------------------
>> Version 4
>> SHEET 1 960 936
>> WIRE -384 96 -512 96
>> WIRE -288 96 -384 96
>> WIRE 64 96 -288 96
>> WIRE 112 96 64 96
>> WIRE 512 96 112 96
>> WIRE 112 112 112 96
>> WIRE -384 128 -384 96
>> WIRE -288 192 -288 96
>> WIRE -240 192 -288 192
>> WIRE 112 192 112 176
>> WIRE 112 192 -16 192
>> WIRE 112 224 112 192
>> WIRE -384 256 -384 208
>> WIRE -240 256 -384 256
>> WIRE 16 256 -16 256
>> WIRE -384 304 -384 256
>> WIRE -240 320 -320 320
>> WIRE 176 320 -16 320
>> WIRE 176 336 176 320
>> WIRE -240 384 -288 384
>> WIRE 64 384 64 96
>> WIRE 64 384 -16 384
>> WIRE 352 384 320 384
>> WIRE 224 416 176 416
>> WIRE 352 416 288 416
>> WIRE 512 416 512 96
>> WIRE 512 416 480 416
>> WIRE -384 448 -384 384
>> WIRE -320 448 -320 320
>> WIRE -320 448 -384 448
>> WIRE 16 448 16 256
>> WIRE 16 448 -320 448
>> WIRE 320 448 320 384
>> WIRE 352 448 320 448
>> WIRE 512 448 480 448
>> WIRE 544 448 512 448
>> WIRE 720 448 608 448
>> WIRE -512 464 -512 96
>> WIRE -384 480 -384 448
>> WIRE -288 480 -288 384
>> WIRE 176 512 176 496
>> WIRE 320 512 320 448
>> WIRE 512 576 512 448
>> WIRE -512 592 -512 544
>> WIRE -384 592 -384 544
>> WIRE -384 592 -512 592
>> WIRE -288 592 -288 544
>> WIRE -288 592 -384 592
>> WIRE 720 624 720 448
>> WIRE -512 640 -512 592
>> WIRE 512 672 512 640
>> WIRE 512 768 512 752
>> WIRE 720 768 720 720
>> FLAG -512 640 0
>> FLAG 112 224 0
>> FLAG 176 512 0
>> FLAG 320 512 0
>> FLAG 512 768 0
>> FLAG 720 768 0
>> SYMBOL Misc\\NE555 -128 288 M0
>> SYMATTR InstName U1
>> SYMBOL res -368 112 M0
>> SYMATTR InstName Tempo1
>> SYMATTR Value 125k
>> SYMBOL res -368 288 M0
>> WINDOW 0 36 43 Left 2
>> WINDOW 3 49 74 Left 2
>> SYMATTR InstName Tempo2
>> SYMATTR Value 125k
>> SYMBOL res 160 320 R0
>> WINDOW 0 -92 42 Left 2
>> WINDOW 3 -88 69 Left 2
>> SYMATTR InstName Vol1
>> SYMATTR Value 500
>> SYMBOL Misc\\battery -512 448 R0
>> WINDOW 0 12 95 Left 2
>> WINDOW 3 17 9 Left 2
>> WINDOW 123 0 0 Left 2
>> WINDOW 39 0 0 Left 2
>> SYMATTR InstName V1
>> SYMATTR Value 9
>> SYMBOL cap -304 480 R0
>> SYMATTR InstName C2
>> SYMATTR Value 0.1nF
>> SYMBOL res 160 400 R0
>> WINDOW 0 -86 47 Left 2
>> WINDOW 3 -87 76 Left 2
>> SYMATTR InstName Vol2
>> SYMATTR Value 500
>> SYMBOL lm386 416 400 R0
>> SYMATTR InstName U2
>> SYMBOL polcap 96 112 R0
>> SYMATTR InstName C3
>> SYMATTR Value 100\xc2\xb5F
>> SYMATTR SpiceLine Rser=1
>> SYMBOL polcap 544 464 R270
>> WINDOW 0 32 32 VTop 2
>> WINDOW 3 0 32 VBottom 2
>> SYMATTR InstName C4
>> SYMATTR Value 250\xc2\xb5F
>> SYMATTR SpiceLine Rser=1
>> SYMBOL polcap -400 480 R0
>> SYMATTR InstName C1
>> SYMATTR Value 2.2\xc2\xb5F
>> SYMBOL polcap 496 576 R0
>> SYMATTR InstName C5
>> SYMATTR Value 0.05\xc2\xb5F
>> SYMBOL res 496 656 R0
>> SYMATTR InstName R1
>> SYMATTR Value 10
>> SYMBOL Woofer 720 672 R0
>> WINDOW 38 -32 28 Right 2
>> SYMATTR SpiceModel IB3858
>> SYMATTR InstName U3
>> SYMBOL polcap 224 432 R270
>> WINDOW 0 32 32 VTop 2
>> WINDOW 3 0 32 VBottom 2
>> SYMATTR InstName C6
>> SYMATTR Value 10\xc2\xb5F
>> TEXT -392 616 Right 2 !.tran 10 uic
>> TEXT -8 176 Left 2 ;1
>> TEXT -8 240 Left 2 ;2
>> TEXT -8 304 Left 2 ;3
>> TEXT -8 360 Left 2 ;4
>> TEXT -296 368 Left 2 ;5
>> TEXT -296 304 Left 2 ;6
>> TEXT -296 240 Left 2 ;7
>> TEXT -296 176 Left 2 ;8
>> TEXT 80 848 Left 2 !.lib Loudspeaker.lib
>> ------------------------------------------------------------------------
>>
>> Thank you,
>>
>> --
>> Don Kuenz KB7RPU
>>
>
> Thanks for the feedback.
>
> Where did you get the symbols and models for LM386 and speaker?
>

The LM386 is available in zipped format at:

http://www.eas.uccs.edu/~mwickert/ece3001/lecture_notes/LM386_support_files.zip

The loudspeaker is available in zipped format at:

http://www.electro-tech-online.com/attachments/loudspeaker-zip.88991/

My asc shown above contains one error. C1 is really 22 uF and not the
2.2 uF shown. As an aside, it turns out that 2.2 uF works better to
debug the circuit because it's easier to see the resultant waveform on
my scope.

Thank you,

--
Don Kuenz KB7RPU

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#448988

On Thursday, 23 February 2017 15:25:14 UTC, Don Kuenz  wrote:
> Tauno Voipio <tauno.voipio@notused.fi.invalid> wrote:
> > On 23.2.17 07:54, Don Kuenz wrote:
> >> Don Kuenz <g@crcomp.net> wrote:
> >>> Tauno Voipio <tauno.voipio@notused.fi.invalid> wrote:
> >>>> On 13.2.17 17:28, Don Kuenz wrote:
> >>>>> Greetings,
> >>>>>
> >>>>> Comments are sought on additional circuitry to increase the speaker
> >>>>> volume of the circuit shown between the lines. Comments on circuit
> >>>>> simplifications are also sought. (Maybe a 555 with a couple of pots is
> >>>>> as simple as it gets sometimes?)
> >>>>
> >>>>
> >>>> The canonical response is LM386.
> >>>>
> >>>> It is not sensible to drive a speaker with a
> >>>> follower here, it will eat your battery in
> >>>> no time, and the speaker does not like the
> >>>> DC bias on it.
> >>>
> >>> Good call! You just exterminated the battery eater in my subconscience.
> >>
> >> The LM386 connected to Realistic Minimus 0.3 Bookshelf Speaker [1]
> >> sounds excellent. Although the tempo pot works "as is" my goal is to
> >> fine tune the pot / C1 circuitry to 40 bpm in fully counterclockwise
> >> position and 208 bpm fully clockwise position.
> >>
> >> My latest LTSpice circuit is included after the Note. It pulls in two
> >> additional LTSpice subcircuits.
> >>
> >> The first subcircuit models an LM386. [2] To use the LM386 just unzip it
> >> then drop the lm386.asy and LM386.lib files into the folder with the asc
> >> file included after Note.
> >>
> >> The second subcircuit models a loudspeaker. [3] To use it just unzip it
> >> then drop the Midrange.asc, Tweeter.asc, Wolfer.asc, and Loudspeaker.lib
> >> into the folder with the asc file. Another goal of mine is to remove the
> >> explicit declaration of Loudspeaker.lib from the asc file.
> >>
> >> Note.
> >>
> >> 1. http://www.ebay.com/itm/272541834843
> >> 2. http://www.eas.uccs.edu/~mwickert/ece3001/lecture_notes/LM386_support_files.zip
> >> 3. http://www.electro-tech-online.com/attachments/loudspeaker-zip.88991/
> >>
> >> ------------------------------------------------------------------------
> >> Version 4
> >> SHEET 1 960 936
> >> WIRE -384 96 -512 96
> >> WIRE -288 96 -384 96
> >> WIRE 64 96 -288 96
> >> WIRE 112 96 64 96
> >> WIRE 512 96 112 96
> >> WIRE 112 112 112 96
> >> WIRE -384 128 -384 96
> >> WIRE -288 192 -288 96
> >> WIRE -240 192 -288 192
> >> WIRE 112 192 112 176
> >> WIRE 112 192 -16 192
> >> WIRE 112 224 112 192
> >> WIRE -384 256 -384 208
> >> WIRE -240 256 -384 256
> >> WIRE 16 256 -16 256
> >> WIRE -384 304 -384 256
> >> WIRE -240 320 -320 320
> >> WIRE 176 320 -16 320
> >> WIRE 176 336 176 320
> >> WIRE -240 384 -288 384
> >> WIRE 64 384 64 96
> >> WIRE 64 384 -16 384
> >> WIRE 352 384 320 384
> >> WIRE 224 416 176 416
> >> WIRE 352 416 288 416
> >> WIRE 512 416 512 96
> >> WIRE 512 416 480 416
> >> WIRE -384 448 -384 384
> >> WIRE -320 448 -320 320
> >> WIRE -320 448 -384 448
> >> WIRE 16 448 16 256
> >> WIRE 16 448 -320 448
> >> WIRE 320 448 320 384
> >> WIRE 352 448 320 448
> >> WIRE 512 448 480 448
> >> WIRE 544 448 512 448
> >> WIRE 720 448 608 448
> >> WIRE -512 464 -512 96
> >> WIRE -384 480 -384 448
> >> WIRE -288 480 -288 384
> >> WIRE 176 512 176 496
> >> WIRE 320 512 320 448
> >> WIRE 512 576 512 448
> >> WIRE -512 592 -512 544
> >> WIRE -384 592 -384 544
> >> WIRE -384 592 -512 592
> >> WIRE -288 592 -288 544
> >> WIRE -288 592 -384 592
> >> WIRE 720 624 720 448
> >> WIRE -512 640 -512 592
> >> WIRE 512 672 512 640
> >> WIRE 512 768 512 752
> >> WIRE 720 768 720 720
> >> FLAG -512 640 0
> >> FLAG 112 224 0
> >> FLAG 176 512 0
> >> FLAG 320 512 0
> >> FLAG 512 768 0
> >> FLAG 720 768 0
> >> SYMBOL Misc\\NE555 -128 288 M0
> >> SYMATTR InstName U1
> >> SYMBOL res -368 112 M0
> >> SYMATTR InstName Tempo1
> >> SYMATTR Value 125k
> >> SYMBOL res -368 288 M0
> >> WINDOW 0 36 43 Left 2
> >> WINDOW 3 49 74 Left 2
> >> SYMATTR InstName Tempo2
> >> SYMATTR Value 125k
> >> SYMBOL res 160 320 R0
> >> WINDOW 0 -92 42 Left 2
> >> WINDOW 3 -88 69 Left 2
> >> SYMATTR InstName Vol1
> >> SYMATTR Value 500
> >> SYMBOL Misc\\battery -512 448 R0
> >> WINDOW 0 12 95 Left 2
> >> WINDOW 3 17 9 Left 2
> >> WINDOW 123 0 0 Left 2
> >> WINDOW 39 0 0 Left 2
> >> SYMATTR InstName V1
> >> SYMATTR Value 9
> >> SYMBOL cap -304 480 R0
> >> SYMATTR InstName C2
> >> SYMATTR Value 0.1nF
> >> SYMBOL res 160 400 R0
> >> WINDOW 0 -86 47 Left 2
> >> WINDOW 3 -87 76 Left 2
> >> SYMATTR InstName Vol2
> >> SYMATTR Value 500
> >> SYMBOL lm386 416 400 R0
> >> SYMATTR InstName U2
> >> SYMBOL polcap 96 112 R0
> >> SYMATTR InstName C3
> >> SYMATTR Value 100\xc2\xb5F
> >> SYMATTR SpiceLine Rser=1
> >> SYMBOL polcap 544 464 R270
> >> WINDOW 0 32 32 VTop 2
> >> WINDOW 3 0 32 VBottom 2
> >> SYMATTR InstName C4
> >> SYMATTR Value 250\xc2\xb5F
> >> SYMATTR SpiceLine Rser=1
> >> SYMBOL polcap -400 480 R0
> >> SYMATTR InstName C1
> >> SYMATTR Value 2.2\xc2\xb5F
> >> SYMBOL polcap 496 576 R0
> >> SYMATTR InstName C5
> >> SYMATTR Value 0.05\xc2\xb5F
> >> SYMBOL res 496 656 R0
> >> SYMATTR InstName R1
> >> SYMATTR Value 10
> >> SYMBOL Woofer 720 672 R0
> >> WINDOW 38 -32 28 Right 2
> >> SYMATTR SpiceModel IB3858
> >> SYMATTR InstName U3
> >> SYMBOL polcap 224 432 R270
> >> WINDOW 0 32 32 VTop 2
> >> WINDOW 3 0 32 VBottom 2
> >> SYMATTR InstName C6
> >> SYMATTR Value 10\xc2\xb5F
> >> TEXT -392 616 Right 2 !.tran 10 uic
> >> TEXT -8 176 Left 2 ;1
> >> TEXT -8 240 Left 2 ;2
> >> TEXT -8 304 Left 2 ;3
> >> TEXT -8 360 Left 2 ;4
> >> TEXT -296 368 Left 2 ;5
> >> TEXT -296 304 Left 2 ;6
> >> TEXT -296 240 Left 2 ;7
> >> TEXT -296 176 Left 2 ;8
> >> TEXT 80 848 Left 2 !.lib Loudspeaker.lib
> >> ------------------------------------------------------------------------
> >>
> >> Thank you,
> >>
> >> --
> >> Don Kuenz KB7RPU
> >>
> >
> > Thanks for the feedback.
> >
> > Where did you get the symbols and models for LM386 and speaker?
> >
> 
> The LM386 is available in zipped format at:
> 
> http://www.eas.uccs.edu/~mwickert/ece3001/lecture_notes/LM386_support_files.zip
> 
> The loudspeaker is available in zipped format at:
> 
> http://www.electro-tech-online.com/attachments/loudspeaker-zip.88991/
> 
> My asc shown above contains one error. C1 is really 22 uF and not the
> 2.2 uF shown. As an aside, it turns out that 2.2 uF works better to
> debug the circuit because it's easier to see the resultant waveform on
> my scope.
> 
> Thank you,

Your asc won't run at all on this machine, no idea why.


NT

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#449001

tabbypurr@gmail.com wrote:
> Your asc won't run at all on this machine, no idea why.

This zip file ought to contain everything you need:

http://crcomp.net/Diary/metronome.zip

Thank you,

--
Don Kuenz KB7RPU

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#449017

On Friday, 24 February 2017 02:17:12 UTC, Don Kuenz  wrote:
> tabbypurr wrote:

> > Your asc won't run at all on this machine, no idea why.
> 
> This zip file ought to contain everything you need:
> 
> http://crcomp.net/Diary/metronome.zip
> 
> Thank you,

Cheers, works nicely. 

Your output voltages are lousy compared to the 9v supply. 

Replacing the 386 and using a transistor output would get you much better swing. But of course it requires other changes to avoid feeding the speaker dc or only operating on one of the 555's transitions. There are a few possible ways to do that. You also don't need the zobel if you're just switching it and using no nfb.

Harmonics help with volume. You might inject some at each opportunity, eg output of 555 then again with passives across the speaker. Low duty cycle there should help with power requirements.

If you go with added digital logic to process the 555 output into a rising edge at each 555 transition you might add some ringing there. The speaker housing can also be thin and somewhat resonant.

I'm assuming you don't need to go to BTL or higher psu voltage.


NT

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#449029

tabbypurr@gmail.com wrote:
> On Friday, 24 February 2017 02:17:12 UTC, Don Kuenz  wrote:
>> tabbypurr wrote:
>
>> > Your asc won't run at all on this machine, no idea why.
>>
>> This zip file ought to contain everything you need:
>>
>> http://crcomp.net/Diary/metronome.zip
>>
>> Thank you,
>
> Cheers, works nicely.
>
> Your output voltages are lousy compared to the 9v supply.
>
> Replacing the 386 and using a transistor output would get you much
> better swing. But of course it requires other changes to avoid feeding
> the speaker dc or only operating on one of the 555's transitions.
> There are a few possible ways to do that. You also don't need the
> zobel if you're just switching it and using no nfb.
>
> Harmonics help with volume. You might inject some at each opportunity,
> eg output of 555 then again with passives across the speaker. Low duty
> cycle there should help with power requirements.
>
> If you go with added digital logic to process the 555 output into a
> rising edge at each 555 transition you might add some ringing there.
> The speaker housing can also be thin and somewhat resonant.
>
> I'm assuming you don't need to go to BTL or higher psu voltage.

You gave me lots of food for thought. The metronome was originally
conceived to be DIY quick and dirty. Your post may motivate me to try
harder.

Sharing this project has been a learning experience for me in many ways.
In the future, for example, my web server will host all .asc files. The
"standalone" nature of a usenet post appealed to me, but it's fraught
with too many ?Windows? gotchas.

My original circuit used a transistor, a 2N3904. But it outputted too
low of a volume, ergo this thread. FWIW, my metronome with a transistor
is available here:

http://crcomp.net/Diary/metronome3.asc

Thank you,

--
Don Kuenz KB7RPU

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