Hi all!
I'm designing an analog enveloppe detector for an audio compressor.
The signal is full wave rectified and then smoothed through a capacitor.
Twice in the circuit, I want to amplify/attenuate the rectified signal, defining the gain with a knob (one for the Threshold one for the Ratio).
Im getting quite a big offset and I can't understand why. This offset is gain dependand, but also amplitude dependent it seems.
I'm using inverting opamp configurations to be able to divide as well as multiply. They are TL072 supplied by +/-15v rails. I tried to place the variable resistor at the negative input, or in the feedback loop.
You guys know what my problem is?
Thanks
I'm designing an analog enveloppe detector for an audio compressor.
The signal is full wave rectified and then smoothed through a capacitor.
Twice in the circuit, I want to amplify/attenuate the rectified signal, defining the gain with a knob (one for the Threshold one for the Ratio).
Im getting quite a big offset and I can't understand why. This offset is gain dependand, but also amplitude dependent it seems.
I'm using inverting opamp configurations to be able to divide as well as multiply. They are TL072 supplied by +/-15v rails. I tried to place the variable resistor at the negative input, or in the feedback loop.
You guys know what my problem is?
Thanks