We found this circuit in the 1990 Motorola Linear Databook. The circuit must use symmetric source and has 10times the voltage gain.
To operate in a harmonic of the crystal frequency, tuned to a trimmer in the resonant circuit of...
This circuit monitors the current in the loads. The NPN and PNP transistors admit the BC547 and...
The presented circuit uses an operational amplifier that is uncommon nowadays, but it can be...