Institute Newton C. Braga

Circuit Bench

Phototransistor Amplifier (CB880E)
This is a single transistor stage for a phototransistor. The circuit is suggested by Texas...
Intermittent Alarm (CB26233E)
This circuit emits a sound at regular intervals to prevent you from falling asleep, for example. It...
Phone and CW FM Transmitter (CB16641E)
This small short-range FM transmitter was found in a 1987 documentation. It is intended for the...