This 20W amplifier was found in 283 circuits from the 90s. The MOSFET admits equivalents. The power supply must be dual, and the transistors must be mounted on good heat sinks.
This reflex receiver for the mid-wave range employs germanium transistors of the time. We found it in...
Using a 106 series SCR, this circuit was found in the May 1971 Radio Electronics magazine. The...
This circuit was found in an old manual of linear integrated circuits of the 80's. Equivalent...