Institute Newton C. Braga

Circuit Bench

Automotive Beacon (CB20325E)
In its original publication this circuit uses lamps but can be modified to use LEDs of any color,...
Tunnel diode transmitter (CB23731E)
This CW transmitter for the 3,5 MHz band, low power, was published in a march 1961 Radio...
Light change detector (CB22182E)
This photoelectric sensor that triggers a relay was found in an English book from 1989. The...