Institute Newton C. Braga

Circuit Bench

Rectangular Oscillator (CB12973E)
The oscillator shown in the figure generates a rectangular signal with a 50% active cycle (square)...
5 Voltage Level Indicator (CB4892E)
This circuit is based on an uncommon Texas component today, as found in an American 1980s...
OK 1783B Commercial Megaphone (CB18360E)
We found this circuit from a commercial megaphone in a Japanese publication in 1967. The circuit is...