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 Forum index » DIY Hardware and Software » Thomas Henry designs
Voltage Controlled Crossfader/VCA
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Thomas_Henry



Joined: Jul 24, 2009
Posts: 129
Location: N. Mankato, MN

PostPosted: Mon Aug 06, 2012 7:57 pm    Post subject: Voltage Controlled Crossfader/VCA
Subject description: Another circuit for your consideration
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Hi Gang,

As promised, here is another circuit for you to play with. It can be used either as a voltage controlled crossfader or as an ordinary VCA. I hit upon this when finally realizing something that was in front of me all the time---the control currents though the voltage-to-current converter are symmetric yet opposite. It's an obvious idea once you see it and has probably been used before. But I was glad to stumble upon it.

Null out the DC thumps in the usual way. (Turn the audio inputs down, then apply a 0 to +5V square wave to the CV input.)

The usual legalese applies. Feel free to use this for personal applications but don't copy, or produce commercially. Anyone wanting to do a non-commercial PCB for EM users please contact me first.

Have fun!

Thomas Henry


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v-un-v
Janitor
Janitor


Joined: May 16, 2005
Posts: 8932
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1

PostPosted: Tue Aug 07, 2012 3:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks fun Mr Henry! Cheers! Very Happy
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inlifeindeath



Joined: Apr 02, 2010
Posts: 315
Location: Albuquerque, NM

PostPosted: Wed Aug 08, 2012 10:17 am    Post subject: Reply with quote  Mark this post and the followings unread

can't wait to try out the new designs thomas! thanks as always for your work!
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widdly



Joined: Jun 25, 2007
Posts: 265
Location: singapore
G2 patch files: 2

PostPosted: Wed Nov 07, 2012 8:39 am    Post subject:   Reply with quote  Mark this post and the followings unread

Thanks for another great design Thomas.

I built it this afternoon on perf board and it works very nicely. Like the other TH designs I've built, the input ranges on all the controls are tuned perfectly.

Very Happy
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