Express Battery Tester without Power Supply by 555 Timer

The circuit was designed without the use of a power supply or a moving coil voltmeter to create a quick battery tester which can test 1.5 V to 15 V battery cells with a two-LED display.

Battery Circuit for Backup/Standby Operation

The circuit was designed to create a spare and reserve power source with the use of batteries  during the absence of power from the mains.

Car Charger for 12V Batteries

The circuit has been designed to produce a battery charger for automobiles that are using 12V batteries only.

Charger Circuit for 6V or 12V Car Battery

The circuit has been designed to construct a practical mechanism that can easily and automatically charge batteries rated at 6 V or 12 V used in automobiles.

12V Lead Acid Battery Discharge Indicator

The circuit was designed to produce an indication before a 12V lead acid battery would reach the discharged state.

Nickel-Cadmium (NiCd) Battery Charger

The circuit diagram shows a regular charger being powered by an AC input source, intended for charging batteries.