This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time and the frequency is determined by the crystal. The circuit operates at voltages from 3 to 9 V.
This switched, switched or PWM amplifier was obtained in the 1972 RCA linear integrated circuit...
This circuit provides a power per channel between 6 and 10 W depending on the load. The circuit is from...
This circuit can be adapted to an FM radio or other receiver that does not have a tuning indicator LED....