This circuit was obtained in documentation on medical applications from 1966. The circuit is used in electromyography by switching the electrodes used with the equipment.
This linear oscillator was found in a 1968 publication. The operational amplifier is from that...
This circuit was found in Radio Electronics from May 1965. The SCRs and transistors are from that...
This Wien bridge circuit, using a 741 operational amplifier, was suggested by Texas Instruments in its 1996...