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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
VCS wiring
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elmegil



Joined: Mar 20, 2012
Posts: 1957
Location: Chicago
Audio files: 16

PostPosted: Sat Mar 12, 2016 5:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, the VCS rise & fall should work just like a DUSG rise & fall. If you're getting very little adjustment to the fall with the knob, then something is wrong.

From what you've said, yes I'd suspect the transistor network.
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wackelpeter



Joined: May 05, 2013
Posts: 335
Location: germany
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PostPosted: Sun Mar 13, 2016 3:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for you response Elmegil. Smile

Found it... have looked all over the circuit several times and didn't saw it...
It was the 1K8 Resistor hooked to gnd at the V/oct input... it was'nt going from the joining bases to gnd it was going from the V/oct input to gnd... so i had 83-84K between the bases and gnd...

Okay now i have far more control over the falling edge also...

trying now to trimm that again...
as far as i can say now... the trimmpot not only affects the amplitude of the slope output but also the frequency...
my VCS wouldn't start to slope faster with the fall pot until i have the rise pot turned a third on... but i right now have soldered a 1k5 in instead of that above mentioned 1k8... will revert this and will also change the remaining resistors for 1% ones...


Update:
Ended up changing all the resistors going to the bases of the transistor network with 1% ones and the 1K8 to gnd on the V/oct input i reduced to 1,65K now i have nearly accurate tracking over at least 2 octaves...
0V 102hz, 1V 207Hz, 2V 409Hz, 3V 768 Hz, 4V 1,348kHz in linear mode with triangle output...
seems to be okay for me... maybe later i will return back to it again to get the maximum out of it...

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