Battery Charger
Using this circuit will give Good Charging results to the Gell Cell Battery
used in the Metal Detector, or any other simular and smaller type battery.
This ...
Battery Low Voltage Beeper
This circuit provides an audible and visual low voltage warning for 12V battery powered devices. When the battery voltage is above the set point (typically 11V)...
Battery Low Voltage Beeper
This circuit provides an audible and visual low voltage warning for 12V battery powered devices. When the battery voltage is above the set point (typically 11V)...
Add current boost to a USB charger
The popular USB interface can charge a portable device while transferring data. But for high-capacity batteries, the 500-mA output current of USB hosts and powe...