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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Add LEDs to envelope generators
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abelovesfun



Joined: Dec 17, 2012
Posts: 18
Location: Portland, OR

PostPosted: Mon Aug 05, 2013 11:47 am    Post subject: Add LEDs to envelope generators Reply with quote  Mark this post and the followings unread

Hello,

I have built two MFOS envelope generators and would love to add an LED to each to show the envelope output.

I thought the best way would be to incorporate this circuit:
http://www.musicfromouterspace.com/analogsynth_new/SOUNDLABMINISYNTH/soundlabmods/soundlabmods.html#LEDINDICATORS

Where the output was tapped instead of an IC.

Of course, these circuits use +/- 12v. Can I just use a resistor to draw some current from the 12 volt (3.33 Ohms) and then the 1k to the LED?
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the19thbear



Joined: Apr 19, 2007
Posts: 111
Location: denmark

PostPosted: Mon Aug 05, 2013 1:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Im in the same situation Smile
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elmegil



Joined: Mar 20, 2012
Posts: 1445
Location: Chicago
Audio files: 14

PostPosted: Mon Aug 05, 2013 8:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

I would just use a 1.2k or 1.5K resistor--whatever you would use if you just wanted to hook the resistor and the LED to power and ground. No need for multiple resistors.. I would expect it ought to work fine. Transistor LED buffers are pretty common.
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sonicwarrior



Joined: Dec 22, 2005
Posts: 226
Location: Cologne, Germany

PostPosted: Tue Aug 27, 2013 6:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Yep, I used a transistor based LED driver on my MFOS ADSR, too, but it runs with +/- 15V. I think I used 1K there.
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abelovesfun



Joined: Dec 17, 2012
Posts: 18
Location: Portland, OR

PostPosted: Mon Sep 02, 2013 8:43 am    Post subject: Reply with quote  Mark this post and the followings unread

I did it and it worked for me - used a 1.5k resistor from the 12v supply.
Video is up here: http://www.youtube.com/watch?v=60zO0kyPWZs

Blink - Blink - Blink!
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