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From: Don Kuenz <g@crcomp.net>
Newsgroups: sci.electronics.design
Subject: Re: How to increase the volume of a metronome?
Date: Mon, 13 Feb 2017 19:28:45 -0000 (UTC)
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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