Institute Newton C. Braga

Circuit Bench

Hearing Aid Amplifier (CB6161E)
This circuit is from a 1968 documentation using one of the first integrated circuits available at the...
Remote Alarm (CB16565E)
The basic idea of this circuit found in a 1988 documentation is to transmit a signal modulated using...
Car Alarm (CB17093E)
This circuit uses an optical door opening sensor sensing the action of ceiling light or another...