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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Single supply VCA?
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Hammer



Joined: Mar 13, 2018
Posts: 12
Location: Russia, Zhukovsky
Audio files: 6

PostPosted: Wed Apr 11, 2018 6:54 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm back with my version of TDA7052A VCA!

Volume pin have something like pullup resistors. If volume pin is not connected, there will be max volume level. If you will connect cap. between volume pin and ground, cap. will be chargered.

Transistor draws this pin to ground. But 0.4V is minimum voltage, when amp output level is already zero. That's why I added diode to minor shoulder of voltage divider.

Left part of this circuit have trigger for drum envelope. MOSFET is for fast cap. charging. This circuit is triggering even when you touch input cap. by finger.


TDA7052A_VCA.jpg
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TDA7052A VCA
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TDA7052A_VCA.jpg



TDA7052A_VCA.mp3
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TDA7052A VCA release example

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