<div>Check out the schematics for the ARP Little Brother. It uses a nifty waveshaping scheme (borrowed from the Pro Soloist) that creates several divided down squares and mixes them in the right proportions to get all sorts of variations (saws and things like that). My guess is that it runs its internal VCO a couple of octaves higher than 'normal' so that the divided down waves are in the right range. I've got the schemos scanned somewhere if you can't find them. Another fun trick might be to have two or three PWM comparators (running off the same VCO), and modulating each one with a different LFO or EG.
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<div>BTW, is your clone going to be programmable like the original OB-1?</div>
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<div>Tim (another fun trick) Servo<br>-- <br>"Where would you like the cold, hard cash of Justice?" - The Tick<br> </div>
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<div><span class="gmail_quote">On 11/4/05, <b class="gmail_sendername">harrybissell</b> <<a href="mailto:harrybissell@prodigy.net">harrybissell@prodigy.net</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Allow several octave (down) of division... and run the sync off that<br>instead<br>of the fundamental. Gives a cool effect.
<br><br>H^) harry<br><br>Jeff Farr wrote:<br><br>> I've been working on my OB-1 clone alot this week and I've nearly<br>> finished copying the schematics into eagle. Of particular interest to<br>> me are the 2 VCO's, each with a sub. I've been thinking about adding
<br>> a third to the design along with a much better modulation routing<br>> scheme including the Xmod and sync, possibly even a SCI-esq polymod<br>> section. I'd also like to add ring modulation to the lineup of
<br>> effects. While I'm thinking about this I'd like input from any of<br>> you who have interesting ideas for OSC design I may not be aware of,<br>> sync/Xmod/ringmod is all I can think of and all I have expirience
<br>> with, is there anything else out there?<br></blockquote></div>