The set of eight DIP switches allows you to tweak that voltage divider. Switch number one connects the 9-volt battery connector to the regulator, serving as a power switch. Each of the other seven ...

They usually need a high-voltage mains transformer and a rectifier to work, but [Hyperspace Pirate] has managed to make a solid-state power supply to power one from a 12 volt battery. Better still ...

The system takes direct current (DC) from the main battery and steps it down from the pack's voltage—usually anywhere from 300 to 900 volts—to the charging voltage of a 12-volt battery which ...

1. The microcontroller incorporates an integrated fixed voltage regulator in a battery-operated water meter. The microcontroller can be supplied directly by the battery, which delivers a voltage ...