[sdiy] CA3130 in Polyfusion Noise module working

[Rutger Vlek]

It's working nicely now! I replaced the 3130 with a LM741 and put -15V to 
it.

About the slow-random output, that works very cool, but it is really really 
slow. Sometimes changes are minor for quite some time and then suddenly a 
big change. Therefore I don't think i'll use it too much, but if you're 
interested I can send you the modified schematic with the changes I made to 
get it working.

I changed to a transistor noise source instead of a zener diode and I 
modified a gain stage I think.

I designed it in Eagle with a PCB too so if you can etch PCB's yourself this 
is a good start. I did NOT prepare the Eagle file for manifacturing in a PCB 
machine, so drilling sizes are not correct. They just mark the spot where 
you should drill manually.

Greetings,

Rutger

ps. I have built the noise module for a stand alone synth with a keyboard in 
it for use on stage. It's semi modular. I've kept a diary of my work on it 
on my bands website at www.orpheo.nl . Check it out if you like. The update 
about the frontpanel wiring and some audio demo's will be online soon.

>From: Larry Spence <larry.spence2 at verizon.net>
>Reply-To: larry.spence2 at verizon.net
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] CA3130 in Polyfusion Noise module...should a new one 
>work?
>Date: Wed, 21 Dec 2005 12:30:38 -0600 (CST)
>
>I used a Harris CA3130 in a noise module (not the Polyfusion), using 
>single-supply +15V power and it worked fine.
>
>I've thought about building that Polyfusion noise generator, mainly for the 
>slow-random output, so please let us know how it turns out when you get it 
>working.
>
>Larry
>