[sdiy] VCO tracking tempco and advice please

[Peng]

I'm looking to start experiments with VCOs. I've put this off for sometime due to the seemingly precise nature or temperature compensation and my lack of understanding.
  In my setup right now I have dosens of modules (VCFs, VCAs, EGs, etc.) but only 2 VCOs (Synthesizers.com) capable of accurately tracking the keyboard (V/oct). I'd like to build four more, though not necessarily the same designs.
  I've been looking at a T. Henry VCO http://www.midwest-analog.com/vco1.html and the Ray Wilson VCO http://www.musicfromouterspace.com/analogsynth/August2003VCO.html. I have a couple of tempco resistors (Midwest Analog) which both circuits (can) use . I'm most interested in the Patchell VCO that looks tempco free, which appeals to me. I would also like to add accurate tracking to my VCFs, again, tempco free. 
   I've seen some info on temp comp but any links and/or info would help a lot. Also, suggestions of VCO designs and experiences would be greatly appreciated.
 
Thanks,
P.


		
---------------------------------
Do you Yahoo!?
Y! Messenger - Communicate in real time. Download now.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20041010/33a0183c/attachment.htm>