Institute Newton C. Braga

Circuit Bench

Light relay (CB23551E)
This photoelectric cell light relay was found in Radio Electronics magazine from April 1958. The...
Preamplifier with the BC549 (CB15720E)
The circuit shown in the figure serves as a pre-amplifier with a voltage gain of around 12 times,...
300 MHz transmitter (CB20473E)
This circuit uses a lower frequency crystal in an excitation system for an oscillator with a coil...