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 Forum index » DIY Hardware and Software » Thomas Henry designs
VCA-1 using 12 volts
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adambee7



Joined: Apr 04, 2009
Posts: 420
Location: united kingdom

PostPosted: Thu Jun 24, 2010 8:09 am    Post subject:  VCA-1 using 12 volts Reply with quote  Mark this post and the followings unread

Has anyone used this with +/-12v instead of +/-15v. Very Happy Very Happy
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drapdap



Joined: Oct 11, 2004
Posts: 202
Location: europe
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G2 patch files: 1

PostPosted: Fri Jun 25, 2010 5:12 am    Post subject: Re: VCA-1 using 12 volts Reply with quote  Mark this post and the followings unread

Absolutely. Works just fine. Smile
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adambee7



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PostPosted: Fri Jun 25, 2010 5:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Cheers man. Very Happy Very Happy
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Sound



Joined: Jun 06, 2006
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PostPosted: Fri Jun 25, 2010 6:02 am    Post subject: Reply with quote  Mark this post and the followings unread

But you should change the value of R23 for unity gain.

At first look , if R12=100K for unity gain at 5V.
R23 should be 240K for unity gain at 12V.
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adambee7



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PostPosted: Fri Jun 25, 2010 6:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks sound. I did wonder if one or few values would change. Very Happy Very Happy
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alanwilder81



Joined: Sep 03, 2016
Posts: 327
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PostPosted: Mon Sep 04, 2017 3:38 am    Post subject: Reply with quote  Mark this post and the followings unread

hello guys,
i am also running my VCA 1 with 12 V.
Although working, it's output volume is very quite.
it's not clear to me what the R 23 and R 12 should be Smile
and, what's the unity gain?
thanks Smile
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wackelpeter



Joined: May 05, 2013
Posts: 430
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PostPosted: Mon Sep 04, 2017 1:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

unity gain: 1:1 amplification

put in 10V p/p and get 10V p/p out, for example...

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alanwilder81



Joined: Sep 03, 2016
Posts: 327
Location: italy

PostPosted: Mon Sep 04, 2017 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks Bastian,

i run the VCA 1 with 12 V instead of 15 V.
and now i sorted it out by lowering R 23 to 200 k
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