<html><body><font face="Helvetica">The drawback is that the main output is a narrow pulse. There is also a low amplitude ramp, but it needs a lot of amplification. I use the LM331 in one of my designs. With the Pease setup, it tracks to within 0.1% up to 100kHz. This is used to drive a ten-step waveform generator.<br><br>Ian<br><br><br>Sent from XFINITY Connect Mobile App<br><br><br>------ Original Message ------<br><br>From: Mattias Rickardsson<br>To: Donald Tillman<br>Cc: Richie Burnett, synthdiy diy<br>Sent: September 3, 2016 at 5:43 AM<br>Subject: Re: [sdiy] SAW core VCO flyback time<br><br>On 30 August 2016 at 23:41, Donald Tillman <don@till.com> wrote:<br>> The ARP/Rhodes Chroma VCO had a unique charge pump VCO core that had a long reset time, but the reset didn't introduce a tuning delay in the cycle.<br><br>That's interesting, a neat way of getting rid of the time issue - but<br>why isn't this more widely used? Were there other drawbacks or<br>imperfections that made it less practical?<br><br>Speaking of the ARP/Rhodes Chroma,<br>if anybody has the service manual in a better PDF form than<br>one-PDF-per-page then I'd be more than happy to take a look. :-)<br>Impressive info site, however:<br>http://www.rhodeschroma.com/?id=servicemanual<br><br>/mr<br>_______________________________________________<br>Synth-diy mailing list<br>Synth-diy@dropmix.xs4all.nl<br>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy<br></font></body></html>