[sdiy] Hacking up an old rhythm board...

[Adam Inglis (sdiy)]

> On 23 Oct 2020, at 12:10 pm, John Ames <commodorejohn at gmail.com> wrote:
> 
> it looks like there might be two separate one-shot decay envelopes
> that are summed into the same "noise gate" (VCA?) Curious to see what
> I find when I finally have a chance to try this thing out.

That’s what it looks like to me too.

I wonder if an SMPS would introduce too much hi freq hash into the audio?

I’ve examined a few drum circuits of this vintage although not this particular one

http://mezzoauto.blogspot.com/2017/06/roland-cr-8000-compurhythm.html <http://mezzoauto.blogspot.com/2017/06/roland-cr-8000-compurhythm.html>

Slightly older is the TR77, using inductors

http://mezzoauto.blogspot.com/2017/05/roland-rhythm-tr-77-how-it-works.html <http://mezzoauto.blogspot.com/2017/05/roland-rhythm-tr-77-how-it-works.html>


A
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