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 transmitter for the 40 meter or 7 MHz band was found in a magazine 73 for radio amateurs of...
This sinusoidal oscillator was found in Radio Electronics in 1989. It uses a 741, but other...
This circuit changes the actuation curve of a 47k or 50k linear potentiometer so that it becomes...