This receiver was found in a 1924 book by Gernsback. The circuit uses three tubes and is powered by 3 batteries of different voltages, common at the time.
This circuit was found in a 1970 American publication. The FETs are power types according to the...
This very simple brake light circuit is activated with the brake lights, just connecting it by...
This voltage regulator from STMicroelectronics provides a 1,2 A current in the voltage range from...