skierguy
Member
I purchased a few LEDs and a “project enclosure” from Radio shack a few months back with the intention of building moon lights for my 55. Well I set them down on my desk and I have been so busy that I have not had time to tinker with it. I planned on using an old cell phone charger as the power supply. It has an output of 3.7VDC 0.35A I don’t see anywhere on the charger that the current is regulated. The LEDs are from radio shack part # 276-316 they are 5mm 3.7volt 20mA 2600mcd. I have looked at other posts but am a little shaky on all the formulas for calculating the resistors needed. I would appreciate a little help… a wiring diagram perhaps showing the resistors needed and where to put them in line. Thank you.