Hey guys,
I have an old used dbx 166a compressor which has a few problems that I am trying to solve. I am quite new to electronics so using this cheap repair as a learning experience.
The issue I am looking at currently deals with the circuit I included, the pot (gate thres) seems to almost be getting VAC (no scope here so not 100% on this) during the first 1/4 turn left before it switches
to a normal value (on the 'working' channel I get -1.6 for the pot fully left, and about -1.8 at max value never but never a + voltage and certainly not a fluctuating one).
I am measuring this on the listed TP in the circuit, which brings me to the topic question...
What exactly is this circuit supposed to do? I have a rough understanding of opamps and transistors but the layout is above my level so any help deciphering it would be appreciated.
I assume it is some know layout with a name so even pointing me in that direction would be great.Additionally, any thoughts on what could be causing the voltage fluctuations would be a bonus.