Transformerless Tube Compressor
R8 determines the fastest possible realease time. With 47k fastest release is approximately 100ms. If faster release time is wanted change R8 to 22k it changes the fastest release to approximately 50ms.
Make sure BD139 is oriented correctly. Emitter goes to the square pad on BD139 footprint.
Rotary switch sidechain
Rotary switch sidechain 1
Rotary switch sidechain 2