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From: Baron on 17 Apr 2010 12:28
Chris Tansit Inscribed thus:

> Can someone please recommend a signal gen for audio work?
> I want to get into solid state and tube/valve amp repair.
> Feel free to suggest a brands/models etc.
>
> What other gear is handy to have?
> I have a scope and a DC PSU.
>
> Any good resources on the web? Books etc I should be reading?
>
> Thanks
> CT

Knock up a multivibrator circuit ! Four resistors, three caps, two
transistors & 9V battery.

--
Best Regards:
Baron.
From: Jeff Liebermann on 17 Apr 2010 12:40
On 17 Apr 2010 06:22:06 GMT, Chris Tansit <tansi(a)keyweb.com> wrote:

>Can someone please recommend a signal gen for audio work?

A computah, of course. Get a 96KHz 24 bit sound card and some
software:
<http://www.sillanumsoft.org/prod01.htm> (see sig gen feature)
There are plenty of others, including some that I use on my iPod
Touch. (I need 2 tones, with very low intermod products, for testing
SSB and ACSSB radios). The nice thing about the laptop or iPod Touch
approach is that it's portable and can be used in the field.

More money but also more versatile are various USB
oscilloscope/generator conglomerations. For example:
<http://www.syscompdesign.com>

>I want to get into solid state and tube/valve amp repair.

You're a bit late. Xsistors happened in the late 1960's.

>Feel free to suggest a brands/models etc.

Price limit? Any specification limits? Need anything besides a
signal generator (pulse, sweep, white noise, portable, etc)? It's
difficult to be specific when your requirements are a bit vague.

>What other gear is handy to have?

Sweep generator, white noise generator, pink noise generator, audio
spectrum analyzer, distortion analyzer, power supply, DVM, dummy
loads, soldering iron, sanity tester, coffee maker, billing software,
etc.

>I have a scope and a DC PSU.

Ok, that's a start. Add a tube caddy to the above list. It really
impresses customers over 60 years old. (Yes, I have one).

>Any good resources on the web? Books etc I should be reading?

Dunno. I never RTFM or Google for info until after I get into
trouble.

--
Jeff Liebermann jeffl(a)cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
From: Robert Macy on 17 Apr 2010 13:12
On Apr 16, 11:22 pm, Chris Tansit <ta...(a)keyweb.com> wrote:
> Can someone please recommend a signal gen for audio work?
> I want to get into solid state and tube/valve amp repair.
> Feel free to suggest a brands/models etc.
>
> What other gear is handy to have?
> I have a scope and a DC PSU.
>
> Any good resources on the web?  Books etc I should be reading?
>
> Thanks
> CT

There are battery powered versions.

There are dedicated instrument packages.

I started using my PC's Sound Card. It was free. Gave me total
control of what was produced and produced the lowest distrotion I've
ever seen.

Then I started using the sound card as a 'scope' and then as a
spectrum analyzer.

So now I have a two channel input high quality spectrum analyzer with
two channel tracking generator outputs!

You want to test the quality of your amplifier? Best system for it.
From: Jeffrey D Angus on 17 Apr 2010 14:38
Robert Macy wrote:
> Then I started using the sound card as a 'scope' and then as a
> spectrum analyzer.
>
> So now I have a two channel input high quality spectrum analyzer with
> two channel tracking generator outputs!

Ya wanna give us a hint as to who's software you're using?

Jeff


--
�Egotism is the anesthetic that dulls the pain of stupidity.�
Frank Leahy, Head coach, Notre Dame 1941-1954

http://www.stay-connect.com
From: Robert Macy on 19 Apr 2010 12:01
On Apr 17, 11:38 am, Jeffrey D Angus <jan...(a)suddenlink.net> wrote:
> Robert Macy wrote:
> > Then I started using the sound card as a 'scope' and then as a
> > spectrum analyzer.
>
> > So now I have a two channel input high quality spectrum analyzer with
> > two channel tracking generator outputs!
>
> Ya wanna give us a hint as to who's software you're using?
>
> Jeff
>
> --
> “Egotism is the anesthetic that dulls the pain of stupidity.”
> Frank Leahy, Head coach, Notre Dame 1941-1954
>
> http://www.stay-connect.com

Much software came on CD with the soundcard, but did not do exactly
what I wanted
I think everything you need is free and available at sourceforge under
gnu license.
There may be other free, or low cost, utility software out there,
don't know

Basically, you need software to talk to the soundcard and software to
manipulate what you want to do.

To talk to the soundcard, I used the soundcard's 'built-in' ASIO
drivers and used ASIO SDK from Steinberg. To write custom C programs,
I used free MS command line C compiler. For FFT, I used the free
'fastest FFT in the west' called fftw


http://www.steinberg.net
asiosdk2.2.zip


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