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 circuit allows regulating voltages from 0 V under currents up to 1.5 A. With the LM350,...
This general-purpose transistor audio amplifier was found in the March 1990 issue of Radio...
We find this circuit in an American documentation from the 80's. The circuit has the coil given by the...