There is no great magic. Get the exact specification for the LEDs you have, forward current, forward volt drop and work from there. What supply voltage do you have/need ?Steve
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I have the same question. I'm going to use a 9 volt battery. The four prongs that the piranha LEDs have are throwing me off. I know two are anodes and the other two are cathodes, but I'm not 100% sure that I can just wire each of them together like they were just two large electrodes. Forward voltage is 2.2 and Foward current is 40 mA. I also wanted to add an on/off switch, but I'm not sure if that'll affect which resistors I'll need to use... Thanks!
Which LED exactly ?
Which am I using? Six of these: http://www.superbrightleds.com/moreinfo/component-leds/5mm-red-piranha-led-90-degree-viewing-angle-5500-mcd/356/1303/
Put three of them in series, with a 50 Ohm resistor, and put another 3 in parallel, with a 50 Ohm resistor. Steve