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 Forum index » DIY Hardware and Software
Vactrol Driving
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youssef



Joined: Sep 18, 2018
Posts: 8
Location: madison

PostPosted: Thu Sep 27, 2018 12:09 am    Post subject: Vactrol Driving Reply with quote  Mark this post and the followings unread

Hi-

I recently acquired a bag of vactrols, but I do not know much about them.
Is there an ideal way to drive them? Does anyone have any preferred driver circuits that they could share?
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AlanP



Joined: Mar 11, 2014
Posts: 519
Location: New Zealand
Audio files: 31

PostPosted: Thu Sep 27, 2018 12:45 am    Post subject: Reply with quote  Mark this post and the followings unread

About the same as you would a 20mA rated LED.

They blow up like LEDs, too Sad

Buchla loved using vactrols in nearly all his circuits.
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wackelpeter



Joined: May 05, 2013
Posts: 430
Location: germany
Audio files: 10

PostPosted: Fri Oct 12, 2018 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

cannot resist to recommend visiting Scott Stites side and his Mutant Vactrol Filter...

You can build it as separate VCF Units or as a multi-mode filter…

you will find the schematics for all versions, some instructions and a PDF download in the link below.

I highly recommend to give the BPF a go on breadboard and run both of it's Outputs on the left and Right channel into your mixing desk.
This one sounds great and gives you a nice pseudo Stereo effect.


https://www.birthofasynth.com/Scott_Stites/Pages/mutant_main.html

Also the Vactrol/LED Driver used in this circuit and some of his others is dead simple and effective

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