Institute Newton C. Braga

Circuit Bench

Audio controlled switch (CB8515E)
Found in 90s Popular Electronics, this circuit fires a load through a MOSFET from an audio signal...
Gas and smoke detector (CB22198E)
This 1989 circuit uses a gas sensor from the era, which is hard to find these days. The circuit...
Waveform Converter (CB10133E)
This circuit squares the waveform of a signal applied to its input. The circuit is from an old...