Found in 1965s General Electric documentation, this circuit is intended for the control of servos connected to the power grid. Equivalent modern components can be employed.
IDT ZSSC3230 Capacitive Sensor Signal Conditioner Available from Mouser Electronics stock, this IDT...
We found this transmitter circuit for different frequency ranges in a 1992 documentation. The...
This crystal configuration can be made with triggers of any logic. The frequency is given by the...