This circuit was found in a 1967 Electronic Design and can be adapted to use modern equivalent components. The circuit provides a symmetrical voltage with the same value as the single input voltage.
This is the basic configuration of an operational amplifier sample & hold circuit. The FET and...
Found on 80's Popular Electronics, this circuit uses an uncommon integrated today. Programming is done...
Found in a 1968 Mullard manual, this circuit can function as an infrared audio link. The...