Found in the October 1979 Radio Electronics magazine, the purpose of this circuit is to monitor the coolant level in a car's radiator. The circuit is based on the LM1830.
The component used, which is not common today, is an electronic attenuator. In this application of the...
Found in Analog Devices documentation, this circuit uses components from the time. Formulas for...
This circuit was found in a Radio Electronics magazine from October 1987. It can be used as a...