Found in an American publication from the 90s, this circuit allows the supply of 3, 6 and 9 V devices with currents up to 1.5 A in the car.
The circuit in the figure indicates when the input voltage exceeds a certain value adjusted by the...
We found this circuit in Radio Electronics magazine from May 1962. The circuit uses rectifier...
This circuit, from a 1974 publication, can be assembled with BC548 transistors. If powered with 6 or...