This PLL with operational amplifiers was found in 1969 documentation. The configuration can be adapted to use modern components. The circuit has a gain of 15 V / V and can operate with 10 kHz signals.
This modern regenerative receiver was featured in the March 1994 issue of Electronics Now...
This circuit is based on an operational amplifier that is uncommon today, but that can reach the...
We found this circuit in Popular Electronics from 1993. The circuit can be assembled with any...