This circuit was found in an ancient American documentation. The power supply is not given, but we have the voltages used. The relay is sensitive type for high voltage.
The circuit shown in the figure is suggested by Texas Instruments (www.ti.com) and makes use of...
September 2017 - Digi International's SX 868 RF modules for low-power 868 MHz CE / RED operation...
We found this chopper circuit in a 1967 publication. The transistors are of the time, and current...