This circuit was found in an American documentation from the 90's. It switches a continuous voltage obtaining an AC voltage at the output of approximately 1 kHz.
This simple circuit for motors that depends on the MOSFET used was found in the January 1998...
This transistorized shield also functions as a logic gate. The power supply can be in the range of 4.5...
Found in a 90s Popular Electronics, this Hartley oscillator uses an output transformer of the type...