minimodular

[Dan Gendreau]

Forwarded to SynthDIY by: Dan Gendreau
On behalf of: Hairy Harry [mailto:paia2720 at hotmail.com]
Sent: Thursday, June 01, 2000 12:42 PM

Hairy Harry Wrote:

You can make the triangle from the saw, as you said. But then you can
non-linear waveshape the triangle and get a sine. There are FET, Diode
Breakpoint (I don't like...) and Differential Amplifier methods. The CA3080,
overdriven with a triangle wave, is an example of the Diff Amp
method.

This way the keyboard tracking is not an issue at all.

I have the VCO board that Chris designed, I'm going to populate only part of
it and get the triangle and sine outs. I'll use the mult jacks for this
puropse.  The TomG VCO4 could be adapted as well...

H^)  harry

>From: "Dan Gendreau" <gendreau at rochester.rr.com>
>To: "vol" <prospective_volition at hotmail.com>,
><synth-diy at node12b53.a2000.nl>
>Subject: RE: minimodular
>Date: Thu, 1 Jun 2000 11:21:18 -0400
>
>From: vol
> > Are they any good? I noticed they don't have a sine wave.
>
>The audio demos on the site sound promising. I havent quite finished
>building mine yet, but I'm 99.9% there. I have like 12 parts left to
>install. Mouser is backordered up the wazoo! :/
>
>Looking at the architecture, its similar to, but better than the Roland
>SH-101. but with 2 oscillators. As far as sine waves go, there are two
>possibilities:
>
>1) There is a waveshaper module that is supposed to turn a saw wave into a
>triangle. Low pass filter that, with keyboard tracking(KEYB) and you have a
>pretty close sine wave.
>
>2) Not sure if the VCF can be pushed into self oscillation, but if it can,
>you have a sine wave there too. Its an old SH-101 trick. And with keyboard
>tracking, the pitch of the sine wave will follow the midi notes you play.
>
>-Dan Gendreau
>

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