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.

Power Supply Using a Burned Transistor (NI019E)
Medium and high power partially burned can be used as diodes in a simple Power supply as shown in...
Error Amplifier and Trigger Generator (CB19981E)
This circuit was found in old documentation. The components can be replaced by modern ones. The...
12 V to 110 V Inverter (CB19043E)
This circuit was found in an Electronics Now of 1988. The circuit is still current, and the power...