[sdiy] Aaah...glad to be back.

[Jim Blair]

Thanks!

Yes, I'm referring to the R.A. Penfold circuits.

I've made new drawings that correct the rough edges of the available 
online pcb diagrams. They are in pdf, and I'm happy to send them to 
anyone who's poking at this little synth.

Tom, I'd be interested in any additional circuits for the Penfold, 
corrections, tips, whatever you think might be fun. Especially if 
they can be done on perfboard (all my pcb etching stuff is long 
gone). Your auto-wah sounds quite interesting.

After the Penfold is done, I'll have a look at the Blacet. Sounds 
like a good next step in complexity and power.


Jim


At 02:37 PM 1/30/2013, you wrote:
>Welcome, Jim!
>
>I've joined since you left, so I don't remember you from the first 
>time around.
>
>By "Penfold" do you mean "based on R.A.Penfold circuits" from his 
>little synth books? In which case I know the circuits pretty well. 
>There are probably better circuits around, but those old ones still 
>have several things I like. For example, I used to build a lot of 
>stomp boxes, and you could run most of them on a +9V battery, 
>instead of his single ended +12V. Most synth stuff requires a dual 
>rail supply. I designed a nice auto-was circuit using his filter 
>design, for instance.
>
>And don't worry - a lot of us on here have got 15 years of dumb 
>questions that we accumulated in a lot less time than that!
>
>Regards,
>Tom
>
>On 30 Jan 2013, at 21:29, Jim Blair <ceratos at shaw.ca> wrote:
>
> > Hi all.
> >
> > After many years away, I've recently revisited my modular synth 
> hobby, and am really glad to be here again. (I was a member of 
> synthdiy many years back.)
> >
> > In the mid 1990's, a close friend and I were building two 
> modulars together. I was starting with a little Penfold, and he was 
> digging into a Formant.
> > About a quarter of the way into our projects, he drove his 
> motorcycle into the front of a truck, and that was the end of that. 
> It's taken about 15 years for me to even open the boxes of parts again.
> >
> > But, here I am. It's time.
> >
> > So I've been repairing my Penfold, and having a look at what he 
> got done on the Formant.
> >
> > I fully understand that the Penfold is kind of crappy, but 
> whatever. It's a good way to jump back in.
> >
> > My questions for today is, has anyone improved the Penfold 
> designs? Better stability, sound, etc? I seem to remember that 
> there were some errors in the schematics too. Are there updated 
> Penfold circuits?
> >
> > Also, what other easy non-Penfold 12v modules are recommended?
> >
> > Thanks guys! Please be patient, I have 15 years of dumb questions 
> accumulated!
> >
> >
> > Jim
> >
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