This 1 kHz circuit was found in American documentation from the 90s. The original operational amplifier consists of a double 741 at the time. The power supply must be symmetrical.
The circuit shown in the figure allows a pressure switch to be used to turn a load on and off in a...
Raytheon's used integrated circuit is no longer common today. The circuit was obtained in a...
Found in a 1968 Electronic Design, this circuit makes use of an unusual ultrasonic delay line...