OPTO compressor design

[Heikki]

Problem with some of the classic opto compressor designs is slow attack and release time. NSL-33-007 optocoupler has fast rise and decay time. With fast optocoupler attack and release can be controlled almost entirely with the sidechain.

https://mm.digikey.com/Volume0/opasdata ... 33-007.pdf

Here's asidechain I came up with

optosidechain.pdf

(97.01 KiB) Downloaded 444 times

RV1 = Threshold
RV2 = Release
RV3 = attack
RV4 = Ratio

Design of the amplifier part should be fairly trivial. Balanced line receiver at the input, series resistor and LDR to ground, make up gain and DRV134 output.

[Heikki]

Opto compressor schematic