The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
This alternating voltage voltmeter was found in a 1967 magazine. The magazine no longer exists, but...
I found this circuit in a 1992 Electronics Experimenter Handbook. The circuit can be easily...
This circuit uses an ignition coil to generate the high voltage that electrifies a fence. However, in...