This excellent 30 W tube amplifier appeared in the April 1963 Radio Electronics magazine that taught how to assemble it. The critical components in our time are tubes and transformers.
Found on a 1969 EDN this circuit switches a current from a digital control signal. The impedance...
This low-current power supply was found in the April 1973 issue of Radio Electronics magazine. The circuit...
The idea of this circuit from a 1960 publication is simple: we can switch the transistor being...