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 Forum index » DIY Hardware and Software
Simple EG and VCA ?
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Mikmo



Joined: Dec 01, 2005
Posts: 150
Location: Copenhagen - Denmark

PostPosted: Fri Sep 01, 2006 12:51 pm    Post subject: Simple EG and VCA ? Reply with quote  Mark this post and the followings unread

Hi all

Does anybody here know of a (very) simple envelope generator and VCA that will run on a single power supply ?

The envelope generator needs only to be of the AR or AD type.

Thanks

Mikael

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bigtex



Joined: Mar 30, 2006
Posts: 321
Location: Cupertino, California

PostPosted: Fri Sep 01, 2006 6:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

I don't have anything in particular, but I know that a 555 can be used to make a one-shot with a fixed delay. Use a capacitor to smooth out the rise and fall, and you have a very simple EG.
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zipzap



Joined: Nov 22, 2005
Posts: 559
Location: germany
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PostPosted: Sat Sep 02, 2006 2:23 am    Post subject: Reply with quote  Mark this post and the followings unread

I use some very simple ar types. It´s just a comparator and a lag circuit. Independant charging/discharging of a cab via diodes.
Depending on where the feedback from the last opamp is going you get lin or log responce, so the vca can also be a simple lin type.
This will sustain after the attack phase as long as a gate is present.
The sustain level (=overall level) could be controlled by a pot after the comparator, or with no comp. by the level of the gate.

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