[sdiy] Semi CMOS Triangle VCO - No OTA

[tomg]

Hi Scott, You don't think I forgot a tri core vco do you? 

This works really well. It's not really a tri-core like OTA 
vcos but there is no switching. There is no setup or trimming 
you turn it on and up pops this (practically perfect no kidding!) 
beautiful tri. I snapped the pic with my Palm and it makes it 
look a  little weird. Might not be able to do it with 4069s but 
it's nice and easy. :) Kinda like the vco4 core but cheaper, 
easier and just plain better. If you try it 1% all those 10Ks 
after  Q2. The vco4 is still better at tracking at ultra-sonic
frequencies. I'll build a vco4 replacement for part-2 with this 
core.
http://www.ele4music.com/pdfs/3541.pdf
http://www.ele4music.com/pics/3541_tri.jpg

BTW  I'm shipping. So some DIY members might have theirs 
by now... Enjoy. :)

Regards
Tom


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