This circuit was obtained in an American publication of the time. Transistors are commonly used. The circuit can be adapted for use as a shield.
The purpose of the diode in this oscillator circuit is to limit the amplitude of the output...
This remote control receiver via the power grid appears elsewhere on this site from other sources....
November 2016 - NXP ARM Cortex microcontrollers for serial interfacing applications, NXP 32-bit...