Found in the March 1985 issue of Radio Electronics magazine, this circuit uses a digital module from the time that makes it easy to configure. The circuit uses a bridge thermistor as a sensor.
Connected to the output of a small amplifier or receiver, this circuit triggers a relay in the...
This oscillator version is from an RCA documentation from the 1970s. Transistors support modern...
We found this circuit in an American documentation of the 80's, being indicated for the test of...