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



Joined: Dec 06, 2016
Posts: 8
Location: Germany

PostPosted: Wed Feb 15, 2017 11:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank U!
But here is another question: if I want to use it internally, as in my example, where the inputs are hardwired to both, the inverted and noninverted output of my filter, could I get rid of the two unity gain amps just before LM13700? And maybe I don't need the two ac coupling capacitors? Shouldn't it be possible to take the direct signals straight into the lm13700s?
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fonik



Joined: Jun 07, 2006
Posts: 3908
Location: Germany
Audio files: 23

PostPosted: Fri Feb 17, 2017 12:50 am    Post subject: Reply with quote  Mark this post and the followings unread

ReToxx wrote:
Thank U!
But here is another question: if I want to use it internally, as in my example, where the inputs are hardwired to both, the inverted and noninverted output of my filter, could I get rid of the two unity gain amps just before LM13700? And maybe I don't need the two ac coupling capacitors? Shouldn't it be possible to take the direct signals straight into the lm13700s?

of course. just keep the 100k/220R voltage divider in front of the LM13700 to keep the signal low fpr minimizing distortion.
(depending on your signal and your needs you might even go as low as 100k/100R. just refer to the datasheet)

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matthias
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fonik



Joined: Jun 07, 2006
Posts: 3908
Location: Germany
Audio files: 23

PostPosted: Fri Mar 10, 2017 4:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

With the kind permission of Mr Thomas Henry i will offer PCBs and front panels for the VC Crossfader/VCA soon. The prototype PCBs arived just today:

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VCXFaderVCA by Matthias Herrmann, on Flickr

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matthias
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fonik



Joined: Jun 07, 2006
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Location: Germany
Audio files: 23

PostPosted: Sun Jul 09, 2017 5:55 am    Post subject: Reply with quote  Mark this post and the followings unread

okay, i decided to do a 12HP version, offering attenuators for all inputs and the AC/DC switches. believe me, you really want all those attenuators!

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TH VC FaderVCA by Matthias Herrmann, on Flickr

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matthias
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fonik



Joined: Jun 07, 2006
Posts: 3908
Location: Germany
Audio files: 23

PostPosted: Tue Sep 05, 2017 12:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

and this is how the finished module will look like:

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TH-VC-Fader by Matthias Herrmann, on Flickr

_________________
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cheers,
matthias
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