This 4-waveband converter circuit was found in Radio Craft September 1948. The power supply is not given, but the supply voltages are indicated.
This well-crafted speed game setup for two competitors was found in a 1998 Poptronics. The circuit...
September 2017 - Microchip is making available through Mouser Electronics the ARM Cortex® M +...
This power source with silicon diodes at a time when valves were still used was found in Radio...