Bargraph thermometer (CB9360E)

Found in Radio Electronics from the 90s, this thermometer uses an integrated circuit that is unusual today. The sensor is a thermistor or NTC.

| Clique na imagem para ampliar |

Humidity and Rain Alarm (CB17475E)
This simple humidity alarm circuit includes a timed warning oscillator whose time is set to R4....
Tone control (CB15478E)
Tone controls for audio applications can also be considered filters that must attenuate certain...
Telephone recording circuit (CB21270E)
Found in an American documentation, this circuit shows how an interface should be made for...