We found this circuit in a 1967 RCA SCR manual. The circuit uses components from the era. The bridge diodes must withstand the current of the controlled load.
USB58xx and USB59xx Devices Integrate a 2:1 Multiplexer to Support Reversible Connection of USB...
This circuit was obtained in a 90s 73 magazine for radio amateurs. The power transistor must have...
The coil and sockets of this circuit found in a QST depend on the frequency band that is intended...