Found in a 1964 Electronic Design this circuit compares two signals by providing the inverse of the algebraic sum of their frequencies. The circuit can be made with modern equivalent transistors.
This circuit was found in the November 1992 issue of Radio Electronics magazine. The circuit has...
This simulation shows how to use an operational amplifier as a voltage comparator. The sample uses the...
The purpose of the circuit of the figure is to control a servomotor remotely using a simple signal...