Institute Newton C. Braga

Circuit Bench

Selectable Gain Preamplifier (CB23999E)
This circuit is from a Radio Electronics from February 1970. The circuit selects the input...
Crystal Elemental Radio (CB18395E)
This simple receiver for listening on the phone was obtained in a 1960 documentation. The circuit is...
Pulse Amplitude Comparator (CB23834E)
This circuit for activating a relay was found in a Radio Electronics magazine from August 1962. The...