It is a 13.8 V x 10 A regulator obtained in a 2008 documentation. The 2N3055 transistors must be mounted in excellent heat sinks and the voltage is adjusted in the trimpot.
This circuit can drive a loudspeaker with near 1 W of Power from 6 to 9 V supplies. The circuit...
This “one channel” demonstration circuit was found in the April 1979 issue of Radio Electronics magazine....
This circuit is from an August 1984 Radio Electronics magazine. It monitors the state of a RAM...