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
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.
OPTO compressor design
Moderator: Heikki
Re: OPTO compressor design
Opto compressor schematic
- Attachments
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- opto.pdf
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Re: OPTO compressor design
Found this the other day. Have you ever test-built this?
How does the Auto Attack interact with the variable attack setting?
How does the Auto Attack interact with the variable attack setting?
Re: OPTO compressor design
I have the boards and I'm going to build one soon.
Auto attack bypasses the attack pot for large transients. For smaller signals the attack pot always determines attack time.
Auto attack bypasses the attack pot for large transients. For smaller signals the attack pot always determines attack time.