SPECIFICATIONS - User selectable charge rate -- 100mA or 500mA - LED shows charging state; it turns on when charging is complete COMPONENTS - C1 and C2 are ceramic multi-layer capacitors, but they can be replaced with electrolytics for better capacitance (ceramic voltage coefficient means that they will only be 3-3.5 uF instead of 4.7 at 5V). - J1 (3-way male header) should be shorted between pin 2 & 3 for 100mA of charging current and 1 & 2 for 500mA of current. - R3 and R2 determine the charge current depending on which of the two is selected from J1. The equation for charge current can be found in the MCP73831 datasheet. USAGE - You can plug the charger into a 5V USB port or solder wires to the exposed USB pads for power. - Setting the charge current selection jumper towards the blue blob on the header silkscreen sets it to 500mA. - Removing the charge current selection jumper terminates the current charge (if one is active).