[sdiy] Simple AR tips

[john mahoney]

This doesn't answer your question but it may be worth a look, anyway:
Harry Bissell's MorphLag circuit http://www.wiseguysynth.com/larry/schematics/Morph-Lag.htm goes from linear to expo as well as in between. Clever, Harry, very clever! :-)

Feed it a gate signal and you've got an AR. It's not as simple as Brodeur's AR, however. Life's full of trade-offs...
--
john


  ----- Original Message ----- 
  From: Peng 
  To: synth-diy at dropmix.xs4all.nl 
  Sent: Saturday, September 18, 2004 2:20 PM
  Subject: [sdiy] Simple AR tips


  I just finished one (of the many) AR envelopes, for the most part it's the Charles Broduer schematic. Consists of 2 diodes, 2 pots, a 741, couple resistors, and LED. I tended to avoid these designs but I'm expecting a MIDI to trigger board from Mr. Maddox and needed envelopes that would reflect the trigger velocities. 
   First problem was the envelope would slow up considerably when it gets close to zero. Not good for percussion. I fixed that by using an offset trim (striaght from TL071 data).
    I've just started experimenting with the AR so if anyone has any opinions or suggestions or tips, please let them flow. Such as capacitor types ( found that polyester SEEMS quicker than the specified electrolytic ). I would like to tweak the response curves but not sure how to approach it.
    Any techniques for employing velocity in patches would be very interesting to hear about.

  Thanks,
  P.
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