Grab the datasheet for your LEDs and open Circuit Playground... find the values for 'Forward Voltage' and 'Forward Current.' 

Plug-em' in, and voila!

It looks like the LEDs I selected require a 1/8 watt 180 Ohm resistor to prevent the battery from over-driving the LEDs and burning them out.


There can be a little variance in the resistor value... +/- 10% shouldn't be a problem. 

Just remeber to enter 3x for the Series LED Count!

You can even free-wire the circuit if you want... my prototype may be ugly, but it works a treat!

I sealed the prototype in epoxy to prevent the connectors from wiggling around. Some of the epoxy ran through the holes in the clip... next time I'll plug those with a bit of hot-glue.

This guide was first published on Oct 06, 2014. It was last updated on Oct 06, 2014.

This page (Datasheet... to prototype) was last updated on Oct 05, 2014.

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