Obtained from an Electronic Engineering of the 90s, these circuits can be applied to almost any operational amplifier. Signal shapes are given next to the diagram.
The purpose of this circuit is to allow common analog multimeters to measure low resistances, on...
We found this circuit in a Radio Electronics issue from July 1969. The lamp remains on until C1...
This circuit was found in a 90s Popular Electronics. The sensor can be any phototransistor. ...