# Thread: LED Wiring Tutorial

1. ## Re: LED Wiring Tutorial

You can use a molex connector.

2. ## Re: LED Wiring Tutorial

There's a real easy way to connect extra wires to a molex, and it looks like it was made that way. Remind me to do a how-to sometime.

reminded xD

4. ## Re: LED Wiring Tutorial

Reminded again.

5. ## Re: LED Wiring Tutorial

Ok, ok, ... I have an old PC in the cellar I can use. Watch this space...

7. ## Re: LED Wiring Tutorial

nice guide thanks for that going to go play later as long as i find the LED's i want

just a question though, why put the resistor at the negative end? a few of the wiring diagrams put it at the begining and some put it at the end.

Thanks
Jim

8. ## Re: LED Wiring Tutorial

When wiring an LED you have three options:
1.wire each LED single with its own resistor
2.wire multiple LED's in Series with a single resistor
3.wire multiple LED's in Parallel with a single resistor

Your current-limiting resistor can be connected to either
the positive or negative side of the LED, it doesn't matter.

What matters is the direction of current flow, since an LED is a type of diode, and for a diode to conduct, it must be forward biased. This means that the positive voltage must be connected to the anode, and the negative to the cathode the shorter lead.

9. ## Re: LED Wiring Tutorial

Here is a LED Circuitry Tutorial.

10. ## Re: LED Wiring Tutorial

Thanks for the response,
I've already read that tutorial, i just wondered why people had done it differently i personally would have thought it would have gone at the front before the diodes.

I must admit im unsure where to go at current as i was tempted to run 2 series of 4 in parallel, though im not sure.

I think running them in parrallel would be better but wasnt sure.
i have 8 Red 2.5 volt LEDs which would run at 20mA.
the way i saw it was 1 of 3 ways.
* 2 series of 4 LEDs in parallel with a 120 ohm resistor at 1/4w on each series.
* 1 parallel circuit with a 68ohm resistor at 2w at the beginning of the series.
* 1 parallel with a resistor on each LED however i have no idea how to work out what ohm / w i need for that.

anyone got any golden advise on which way i should potentially go.

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