Constant-Current Battery Charger Kit

This is the Constant Current Battery Charger Power Supply Kit. This kit is designed to supply a constant DC current to your re-chargeable battery. It uses the LM317T in a constant-current configuration. The current regulation is typically 0.01% per Volt. It will deliver a very steady DC current, even under varying loads. This kit will allow you to trickle charge your battery.

This will provide trickle charging current to NiCad, NiMH, Li-Ion, and Lead-Acid batteries.

Constant Current Power Supplies maintain a constant CURRENT to the output load by varying the output voltage. As your load varies in resistance, such as when a load heats up or cools down, the output voltage varies just enough to keep the current across your load steady.

The input DC voltage to the power supply must be at least 2.5v higher than the target (battery) voltage .The typical voltage input range is anywhere from 4v to 25v. The higher voltage inputs may require a heatsink on the LM317T. A heatsink is not supplied with this kit. The minimum input voltage to the constant current power supply is 4.0v

Please select the Constant Current value you require. Available currents are from 10mA to 250mA. If there are any other values you need, please contact us. These are fixed values that the power supply will deliver, they are not adjustable.

This kit requires that a DC voltage be fed to it in order for it to properly work. You must provide a DC source, such as a wall-mount power supply or such. Do not connect this kit directly to the AC Line.

This kit is also offered as a Built & Tested for those that do not want to build the kit themselves.

The PCB is small and compact. It is 1.0" x 2.0" with 2-pin screw terminals for the input and the output. It also has 2 mounting holes. The PCB is 0.062" thick, double-sided, plated thru-holes with silkscreening on the top side. This is a low-profile kit and is about 1/2 inch in height when built. You get the PCB, all of the components, and a schematic. This is a kit which will require that it be assembled. You will need tools, such as, a soldering iron, solder, wire cutters, etc.