[sdiy] Newbie & Zener D equivalents

[Jay Schwichtenberg]

PAIA still has these, I ordered a few when I ordered some FracRak stuff.
Check their parts section at their WEB page: http://www.paia.com/parts.htm

I have been using 2N2222s but wanted to try 2N2712s out. At least the
2N2222s I have seem to be noiser and have a broader spectrum (more higher
freqs) than 2N3904s. But 2N2712s are supposed to be better yet.

Jay

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Scott Bernardi
> Sent: Monday, November 26, 2001 9:34 PM
> To: harry
> Cc: THOMAS, Mervyn; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Newbie & Zener D equivalents
>
>
> I used a old 2N2712 I had left over from 25 years ago when I was
> building PAIA 2700 modules from scratch (PAIA used a lot of 2N2712's).
> It was weird - it would intermittently jump the noise level up by a
> factor of ten for a second or so, then back down. I think that's called
> "popcorn noise". Sounded horrible.  I replaced it with a 2N3903 and got
> nice even noise, although I had to increase the gain (since it's a much
> quieter transistor than the 2N2712).
> Here's my noise source:
> http://members.home.net/sbernardi/elec/og2/og2_noise_source.gif
>
>