Originally, this circuit was created to monitor the liquid level in the reservoir of a car's windshield wiper. The circuit is from documentation from the 90s.
This circuit was found in a 1965 Electronic Design. The transistors are of the time, but the...
We found it in the Radio Electronics magazine of June 1986. The reference voltage is adjusted in...
Operating at just 1.35 V this circuit was found in a 1969 Electronic Design. The circuit makes use...