[sdiy] Hard Sync mod for Serge Osc?

[James R. Coplin]

Thanks! That almost fixed it. I pulled the resistor out completely and I
definitely am getting hard sync type behavior now. It isn't as smooth as I
would like but it works well enough to get by for the time being. I don't
know that I want to monkey around with the circuit too much, at least not
right now. ;)
 
James R. Coplin
***************
If anyone asks of my whereabouts,
simply tell them i've gone out the window
for a spot of tea and am not
expected back any time soon.
***************
  _____  

From: mark verbos [mailto:mverbos at earthlink.net] 
Sent: Sunday, December 05, 2004 3:06 PM
To: James R. Coplin
Subject: Re: [sdiy] Hard Sync mod for Serge Osc?
 
try making the 22k resistor on the sync in smaller. I think that's the only
option.

That signal goes through the 22k then through a 220p cap. That's connect,
along with a 2.2k resistor to +4 volt reference, to the comparator's summing
node. You could always replace that whole mess with what's on the ASM-1 VCO.
That is the signal goes through a 100p cap and then connects to the summing
node along with a 10k to ground and a 20k to +15.

Though I think making the resistor smaller, or just eliminating it, will do
the trick.

Good luck!


mark


James R. Coplin wrote:


Does anyone know if it is possible to modify the Serge oscillators (either
the NTO or PCO) to use hard sync? The soft sync that is currently
implemented on them has to be about the most useless thing I've ever heard.
It doesn't sound like it does anything at all.  I was hoping to be able to
change this to a more traditional hard sync behavior. Any ideas?
 
James R. Coplin
***************
If anyone asks of my whereabouts,
simply tell them i've gone out the window
for a spot of tea and am not
expected back any time soon.
***************
 
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