Found in a 1947 publication, this circuit uses 4 parallel/push-pull tuber in the output stage. The circuit employs dual power supply with two rectifier tubes.
This is a traditional commercial circuit that can be assembled if the reader finds the components used....
This Power supply is intended to Power small loads with currents up to 30 mA. The voltage depends...
This code key uses a PLL and an oscillator that generates two frequencies that must be recognized for...