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I want to run 20-12v leds, witch allready have resistors, what circuit am i best using and what power will i need?ty? Answered

Basicly i want to run 20 5mm uv leds, they allready have the resistors prewired, and state a 12v power source is needed but i wanty to run all 20, what circuit would be best and what kind of power suply and voltage any help would be great chhers

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frollard (author)2010-07-17

Both steve and trub are correct == Each led series strand needs its own resistor. In this case it is a strand of 1, with a big resistor to burn off about 9 of the 12 volts. They can be wired up right now all in parallel + to +, - to -. directly to 12 volts.

The Solution trub is saying is to remove the individual leds, and run 3 or 4 of them in series.  Then you would only need a small resistor to burn off the last tiny bit of voltage to protect the strand.  It's more work.

Both will work --  I don't like the pre-resistor'd leds, as they remove a lot of the options.

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user
trubshac (author)2010-07-17

Can you remove the resistors? If so, you put a number of them in series with a single (different value) resistor.

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steveastrouk (author)2010-07-17

You run them all in parallel, off a 12V powersupply. Steve

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