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.

Low voltage detector (CB9685E)
This circuit activates a buzzer when the voltage applied to the input falls below a preset value in...
Window Comparator (CB26066E)
This simple window comparator based on the well-known LM339 was found in the June 1998 issue of...
Logic pulser (CB8198E)
This circuit, which can act as a shield, was found in a 1990 PE Hobbyst Handbook. The circuit...