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Author Topic: envelope / inverse envelope vactrols  (Read 5793 times)

Dj Task Manager

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envelope / inverse envelope vactrols
« on: October 28, 2013, 04:56:28 PM »
Hello folks,

Im trying to make LED envelope indicator circuits to use as vactrols in my SK5.  I want one LED that is bright then dips when the note sounds and one that is dark then illuminates (repeated 4 times for the 4 envelopes of the polyphony) .  This is so I can modulate the other effects I have added with the envelope signal via vactrols.

I made a couple of crumby circuits botching together schematics off of the internet with NPN and PNP transistors however they seem to have stopped working and im flummoxed.  Has anyone seen a circuit that would do this?  

Thanks!
« Last Edit: October 29, 2013, 01:16:43 PM by Dj Task Manager »
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Dj Task Manager

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Re: envelope / inverse envelope vactrols
« Reply #1 on: October 29, 2013, 12:23:55 PM »
This is a work around I have come up with.  It works quite nicely, I was just curious if it is bad sick and wrong to use an LDR to short across the LEDs?  Will the LDR die after a short amount of use?


http://mpanimation.blogspot.co.uk/2013/10/env-inv-env-led-vactrol-thingy.html
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