Led help?

I have a simple project I need help with. It's a dual 10 LED light which hangs from my glasses to light the area I'm working on. It's nothing major but, I'm good at 3d printing but know very little in electronics. They are 3 mm LED's 3.2 volts 20 ma. Can someone help me with wiring this to an easy battery pack that I can attached to my belt etc. It needs to power 20 of them and last for 2-4 hours maybe. thx!

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amgalbu over 10 years ago +4

I think the best solution is to make a parallel of two LEDs in series (see diagram) Each 150 ohm resistor dissipates 60 mW, so 1/4 W resistors are fine I assumed that 9V alkaline battery are going to be…
Robert Peter Oakes over 10 years ago +2

Hi Brad, you posted this in 3 different places, please remove two of them, nothing worse than having to answer the same thing 3 times or having threads going in different directions for the same thing…
Robert Peter Oakes over 10 years ago in reply to amgalbu +1

The more in series the better and more efficient if your going to include a boost converter then perhaps 4 groups of 5 and about 18V supply don't forget though, if your using a LIPO, make sure its got…

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0 Robert Peter Oakes over 10 years ago

Hi Brad, you posted this in 3 different places, please remove two of them, nothing worse than having to answer the same thing 3 times or having threads going in different directions for the same thing

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Peter
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0 bradnorwood over 10 years ago in reply to Robert Peter Oakes

I did this intentionally, there are different followers in those areas
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0 bradnorwood over 10 years ago in reply to Robert Peter Oakes

I did this intentionally, there are different followers in those areas
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