Integrator with bias compensation (CB20991E)

This circuit was found in a Popular Electronics from the 90's. It can be implemented with equivalent operational amplifiers.

12 W Stereo Amplifier TDA1010 (CB14721E)
We found this amplifier for automotive use in the Philips integrated circuit manual from 1990. The...
Digital Audio Recorder (CB18606E)
This interesting circuit records a few seconds of audio signals, reproducing them in a small...
Optocoupler Input Shield (CB18262E)
Settings like this can be found at various points on this site. The trigger door can be a 4093...