Institute Newton C. Braga

Circuit Bench

100 Hz pulsed alarm 555 (CB8439E)
Using 555 integrated circuits, this alarm circuit was found in a 90s American documentation. The signal...
Instrument protection (CB8380E)
This is the conventional protection system for a low resistance analog instrument (millameter or...
Two megaphones (CB23658E)
These two circuits were found in Radio Electronics magazine from February 1960. The transistor is a power...