Suggested by Fairchild in a 1980s publication, this multiplier uses operational amplifiers from that time. The power supply must be symmetrical.
June 2016 - It can be obtained from Mouser Electronics Power inductors for automotive use of...
This is actually an automatic dimmer we find in an American 1980s documentation. The triac must be...
This circuit is from an American documentation of 1975. The FET may be the BF245 and the relay is of...