Institute Newton C. Braga

Circuit Bench

RTTY Demodulator (CB21760E)
This circuit was found in a 1977 radio amateur manual. Integrated circuits are operational...
Overtone Oscillator 2 (CB13122E)
In the figure we show a configuration for a crystal-controlled overtone oscillator using a...
Opto Power Shield (CB23723E)
The transistor used is a high current Darlington, but an equivalent discrete configuration can be...