saint gillis
Well-known member
Hello, I'm using an active gain pot in a circuit :
https://image.ibb.co/eX55RL/ACTIVE-GAIN-POT.jpg
The supply is +/-17VDC, the op amp is bypassed rail to rail with a 100n cap
The wires to the pot are few inches (not so long).
When I turn the pot a bit more than unity gain it starts to oscillate and being distorted and weird and so on...
I tried a 1n cap in the feedback loop... didn't change
I tried to bypass rail to ground... didn't change
I tried to bypass rail to ground with 10µ caps ... didn't change
In fact I tried many thing and didn't find any solution.. I must be wrong somewhere, so H-E-L-P !
Cheers.
https://image.ibb.co/eX55RL/ACTIVE-GAIN-POT.jpg
The supply is +/-17VDC, the op amp is bypassed rail to rail with a 100n cap
The wires to the pot are few inches (not so long).
When I turn the pot a bit more than unity gain it starts to oscillate and being distorted and weird and so on...
I tried a 1n cap in the feedback loop... didn't change
I tried to bypass rail to ground... didn't change
I tried to bypass rail to ground with 10µ caps ... didn't change
In fact I tried many thing and didn't find any solution.. I must be wrong somewhere, so H-E-L-P !
Cheers.
