Opto dicussion

[StephenGiles]

http://www.prodigy-pro.com/forum/viewtopic.php?t=28423

[petemoore]

  A nice demonstration of the  "easy" way to compress.
    I spent a month in a dark room
    That sounds like fun !
   I can only add sketchy theoretical peanut gallery comments, all of this is probably previously covered:
  First find a portion of the LDR sweep that looks particularly useful, perhaps limiting the R sweep range...then bending the Comp circuit the LDR leads are attached to so it responds to that range...
  Perhaps use ambient low level light on the LDR light to keep the LDR towards the low R side is what I guess might help...it seems to be needing more 'light pressure' to get to low resistances, maybe putting enough 'pressure' [low light] to get it half way 'sprung' toward low resistance would make a speedier, more controllable sweep, if over a smaller R range.
  "Scoping the response curve...would have to be done 'at speed' to be really useful for shaping it to compression needs...however if done slow enough [ie using a DMM would require letting the LDR 'settle' at whatever light conditions you wanted to measure teh resistance at] then tested for it's match to the compressor circuit...you'll hopefully be able to tell where you want speed and 'accelleration' in the LDR sweep...