Experience with Elliot Sound Projects #92 Compressor?

[yano]

I'm looking at building a compressor, primarily for bass. Has anyone tried building the Elliot Sound Projects #92? http://sound.westhost.com/project92.htm

If so, any thoughts, regarding the sound, or recommendations versus other designs?

Thanks!

[soggybag]

I have not seen this before but it reminds me of the Flatline. Flatline uses only two op-amps. No output buffer and no Vref op-amp.

[petemoore]

If so, any thoughts, regarding the sound, or recommendations versus other designs?
  just recommendations versus other designs. and thoughts and regards to the sounds.
  I like photocell type compressors.
  This one can be set up to suit my needs, and I'll be fond of using it, at least that is the plan I should follow through with.
  Other designs may offer something where the dark resistance is concerned, it takes time, but not that much if you get a 'quick to reach dark resistance' LDR.
  Smallbear has 'em.
  Otherwise I like 'em because of the basic topology you see. This has interesting twist on how to operate split supply from @ 12v supply, I'd put a regulator if the WW doesn't match a battery for low noise input.
  TL072...got 'em, they're nice for audio circuits, the LED amplifier circuit is a 'work section', not in the audio path directly.
  The article is very complete, and with the detailed text describes the simple, useful compressor circuits needs etc., great project IMO.
   
 

[yano]

Thanks for the info...I'm going to bread board it soon, I'll let you all know how I like it

[Mark Hammer]

Looks pretty close to the Anderton EPFM compressor and the Thomas Henry / Jack Orman Whisper compressor too.

[petemoore]

  If fast response of large volume changes during fast, hard picked low notes with minor 'ducking' is the goal...it never was for me so I can't suggest a compressor for that.
  Otherwise it's a minimalist-ish compressor, quick build, if the photocell can't be made to perform fast large sweeps and the LED current control doesn't follow the ramp rates desired [and can't be tweeked to do so], perhaps it's another compressor which will be easier to set up for that, it will almost necessarily be more complicated.
  Otherwise the straightforeward platform should be fairly easy to set-up for basic really nice compression response, not sure how fast other than...I also like the duck when I Hammer Hard Low Notes [and high notes sometimes] anyway, I'm using what are probably more sluggish photocells than are available.
  I have and use liking the compressors as a reason to build another, photocells have been good to me in this respect, the DOD is tied by PS and buried with others in a rackmount 2tier pedalboard, I could use a comp which expects high inputs, and...looks just like what we're looking at here, I like the PS option shown.
  I fiddled with the rates of sweep on the Dyna, and my feeling is that as shown, the circuit is well 'centered', straying too far from the sweep-controlling values shown results in wobbly, abrupt or otherwise slow response, cool effects to have on a switch so 'centered' can be defaulted to when desired.

[PRR]

I've done that idea with a Crown D-150 instead of TL072.

The general idea dates to the LA2-a, a 1950s broadcast limiter now widely used in studios.

The LDR used has a major effect on sound. Most generic LDRs will give brutal action. LA2-a used hand-selected LDRs of a type no longer made.