[sdiy] new noisetoy design from ray wilson

[harrybissell]

Run it on 15 V

If you are worried about reverse bias on the tranny, add a diode in
series with the base. Then no reverse bias current can flow.

Probably no big deal anyway with the 100K resistor in series with the
base... but if you're shy...

H^) harry

Seb Francis wrote:

> 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