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Re: Audio Generator or Function Generator? Which to get?

Cross-posted to 2 groups.

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On 2017-03-13, oldschool@tubes.com <oldschool@tubes.com> wrote:
> I've been looking into buying an Audio Generator (Sine and Square Wave).
> I mainly want this to run thru an amplifier to listen to the frequency
> repsonse of the amp and speakers. Nothing very scientific, just to see
> what these amps and speakers can do.... And on occasion to inject an
> audio signal into amp sections to dee if the audio is passing that
> stage. 

Any reason you've not looked at PC software?

> My search on ebay lead me to something called a "Function Generator".
> What the heck is that??? And also called a DDS device. (I have no clue
> what DDS means).

look it up on wikipedia. it means that inside there's some sort of computer
generating a digital wavform, that gets converted and comes out the output

> But I carefully looked at this NEW device, sold without
> a box (case), but only needs a power module and test leads. They sell
> for around $14 from China, but since I dont care to order from China,
> I'll probably have to hunt one down from the US, and pay around $5 or
> $10 more. But that's ok. These have both the Sine and Square wave, as
> well as Triangle wave (what does that sound like?). 

you can probably buy he same thing from china on ebay, for about the
same price, most large scale vendors are present in multiple
marketplaces.

> IS THIS WHAT I AM LOOKING FOR?
> Is something like this made to really be used, or is it just another toy
> that does little and fails in a few months?

it will probably last longer than a few months, especially if you put
it in a good case.

> And can something like this work to test tube amps, without blowing up
> from the high voltages in tube gear?
>
> One last thing that has me puzzled. There are two BNC connectors. One is
> labeled DDS, tho other is HS. 
>
> I found this in the description. 
> DDS frequency range: 1Hz-65534Hz, high-speed frequency (HS) output up to
> 8MHz. 

> I dont understand how or what the high speed feature does. Why would an
> audio frequency be or need "high speed"? And what is the point for this
> device to go above 20,000 cps, since we cant hear that anyhow? Going up
> to 8MHZ seens senseless, unless this also serves as a RF signal
> generator.

it's probably a square wave at 128 times the DDS output frequency.
it might be useful for other purposes 

-- 
This email has not been checked by half-arsed antivirus software 

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Thread

Audio Generator or Function Generator? Which to get? oldschool@tubes.com - 2017-03-13 02:26 -0600
  Re: Audio Generator or Function Generator? Which to get? Colin Horsley <horsley-spam@westnet.com.au> - 2017-03-13 20:20 +1100
  Re: Audio Generator or Function Generator? Which to get? Jasen Betts <jasen@xnet.co.nz> - 2017-03-13 09:32 +0000
    Re: Audio Generator or Function Generator? Which to get? Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2017-03-14 09:22 +0000
      Re: Audio Generator or Function Generator? Which to get? Phil Allison <pallison49@gmail.com> - 2017-03-14 03:14 -0700
        Re: Audio Generator or Function Generator? Which to get? "pfjw@aol.com" <pfjw@aol.com> - 2017-03-14 05:13 -0700
  Re: Audio Generator or Function Generator? Which to get? Ralph Mowery <rmowery28146@earthlink.net> - 2017-03-13 10:13 -0400
  Re: Audio Generator or Function Generator? Which to get? "pfjw@aol.com" <pfjw@aol.com> - 2017-03-13 07:54 -0700
  Re: Audio Generator or Function Generator? Which to get? Jeff Liebermann <jeffl@cruzio.com> - 2017-03-13 09:27 -0700
    Re: Audio Generator or Function Generator? Which to get? oldschool@tubes.com - 2017-03-13 14:23 -0500
      Re: Audio Generator or Function Generator? Which to get? "pfjw@aol.com" <pfjw@aol.com> - 2017-03-13 12:33 -0700
        Re: Audio Generator or Function Generator? Which to get? oldschool@tubes.com - 2017-03-13 15:03 -0500
      Re: Audio Generator or Function Generator? Which to get? Ralph Mowery <rmowery28146@earthlink.net> - 2017-03-13 16:28 -0400
      Re: Audio Generator or Function Generator? Which to get? rickman <gnuarm@gmail.com> - 2017-03-14 19:57 -0400
  Re: Audio Generator or Function Generator? Which to get? amdx <nojunk@knology.net> - 2017-03-13 13:43 -0500
    Re: Audio Generator or Function Generator? Which to get? amdx <nojunk@knology.net> - 2017-03-13 14:01 -0500
    Re: Audio Generator or Function Generator? Which to get? oldschool@tubes.com - 2017-03-13 14:33 -0500
      Re: Audio Generator or Function Generator? Which to get? amdx <nojunk@knology.net> - 2017-03-13 14:51 -0500
      Re: Audio Generator or Function Generator? Which to get? rickman <gnuarm@gmail.com> - 2017-03-14 20:02 -0400
  Re: Audio Generator or Function Generator? Which to get? "Benderthe.evilrobot" <Benderthe.evilrobot@virginmedia.com> - 2017-03-13 21:15 +0000
  Re: Audio Generator or Function Generator? Which to get? rickman <gnuarm@gmail.com> - 2017-03-14 14:31 -0400
  Re: Audio Generator or Function Generator? Which to get? jurb6006@gmail.com - 2017-03-15 00:22 -0700

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