[sdiy] new noisetoy design from ray wilson

[Seb Francis]

This is a very cool little circuit :) .. I'm just about to build a 
version with MIDI->GATE, AR Envelope + VCA circuitry.

.. but I want it to run from 15V supply (this is what is available), and 
I'm a bit stuck how to modify Ray's circuit to do this - it seems that 
if the supply voltage goes too far above 9V then Veb of the transistor 
exceeds 6V and reverse breakdown occurs.

I'd appreciate it if anyone can see a solution to this .. the only thing 
I can think of is to power the 40106 from a potential divider or a 
voltage regulator .. but maybe I'm missing a more elegant way?

Seb



R. Drake wrote:

> Apologies if Ray already announced this, but i just noticed that he 
> has a new project posted to his site:
>
> http://www.musicfromouterspace.com/analogsynth/YOUR_FIRST_SYNTH/YOUR_FIRST_SYNTH.html 
>
>
>     "An afternoon's worth of project to get you going with weird
>     sounds. A handful of components, some switches and potentiometers,
>     a 9V battery, one CD40106 chip (actually half a chip) to get Zany,
>     Wacky, and Weird Sounds. Add another chip (general purpose Op-Amp
>     like a LM741) and you step up to Odd sounds. Who could ask for
>     anything more. If you have kids make one for them and they'll keep
>     their sticky little hands off of your Moog or Buchla or (and far
>     more importantly) your lovingly crafted synth-diy " treasures.
>     Oh... this is NOT a cruel practical joke this circuit really works. "
>
>
> Looks like fun to me...
>
>
> bbob