Steve Jones
Well-known member
Thanks to Niko, who kindly posted me photocopies of these diagrams, here are the circuits for the ADR Gemini compressor.
http://homepage.mac.com/agenttriez/
I got one recently, as I use an ADR Vocal Stresser all the time, and I hope that this will have a similar character, but stereo. It is an all discrete FET design, the only chips in the unit are the meter drivers. I haven't heard it properly yet as it needs some service, currently the left and right channels are uneven, but a re-cap, re-trimpot and some new pots and a calibration should see to that. Oddly enough for ADR it is unbalanced, but if it sounds good I will soon fix that!
I haven't posted the PCB layout, it looks a little busy to reproduce well, lots of stuff overlayed onto it, but the PCB is silkscreened, so anyone servicing one shouldn't have a problem. The schematic shows 1 of 2 channels, each channel has identical component numbers/designations.
http://homepage.mac.com/agenttriez/
I got one recently, as I use an ADR Vocal Stresser all the time, and I hope that this will have a similar character, but stereo. It is an all discrete FET design, the only chips in the unit are the meter drivers. I haven't heard it properly yet as it needs some service, currently the left and right channels are uneven, but a re-cap, re-trimpot and some new pots and a calibration should see to that. Oddly enough for ADR it is unbalanced, but if it sounds good I will soon fix that!
I haven't posted the PCB layout, it looks a little busy to reproduce well, lots of stuff overlayed onto it, but the PCB is silkscreened, so anyone servicing one shouldn't have a problem. The schematic shows 1 of 2 channels, each channel has identical component numbers/designations.