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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
VCA - CV Feedthrough and Gain
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Flub



Joined: Nov 22, 2010
Posts: 2
Location: Germany

PostPosted: Sun Oct 21, 2012 7:12 am    Post subject: VCA - CV Feedthrough and Gain Reply with quote  Mark this post and the followings unread

Hello,
I just build the MFOS VCA and changed some resistors to work better with +-15 V supply voltage instead of the +- 12V the original circuit was designed for.

Now when calibration I recognized that the cv feedthrough of a 5V peak to peak control voltage is about 110mV peak to peak.

When I turn the 2k Trimmer to lower the feedthrough I can turn it all the way to ground (so the trimmer makes no sense anymore...) to get it as low as it can be, this is about 100mV peak to peak.
Well the problem now is that the gain of the whole vca is much to low now because 5 V at the cv input and 5v peak to peak at the signal in lead to a
2V peak to peak Signal at the output.
What gain considering the CV as Multiplier of the signal input is normal for VCAs?

Please give me a hint so I can go on building the vcas = )

best,
Flo
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Flub



Joined: Nov 22, 2010
Posts: 2
Location: Germany

PostPosted: Mon Oct 22, 2012 2:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

hi,
I just want to know if my english was incorrect or if i should ask ray wilson himself.

-Flo
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