This circuit with two operating modes was found in the September 1989 issue of Radio Electronics magazine. Other operational amplifiers can be used. The power supply must be dual.
We find this circuit in the 80s used integrated circuit manual itself. The integrated circuit is not...
Found in a 1968 Electronic Design, this circuit makes use of an unusual ultrasonic delay line...
This setting appears multiple times on the site from different sources. This is from a 2000 manual...