We found this circuit in an old American documentation. The operational amplifier is from the time and the output used to control an SCR or other power control.
This circuit was found in a 1966 publication using a microwave transistor of the time. The circuit...
The integrated circuit used in this application is the National Semiconductor's LM2907, the...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...