General Electric suggests this circuit in a 1980s documentation. The operational of the time is FET-type input. Modern equivalents may be used.
The purpose of this circuit is to sense the water level in the windshield wiper reservoir. The circuit...
We find this circuit in an old American documentation. It can provide a 25 dB compression in a...
This alternating voltage voltmeter was found in a 1967 magazine. The magazine no longer exists, but...