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Topic: can leds meant for ac be run with dc? (Read 1 time) previous topic - next topic

jameshutton

I plan on running some led christmas lights on a mosfet controled by an arduino so that I can dim them. Will it work?

Runaway Pancake

#1
Nov 25, 2012, 03:49 pm Last Edit: Nov 25, 2012, 04:12 pm by Runaway Pancake Reason: 1
Perhaps, but making the attempt will depend upon your ability to find out what the situation with your LED strings is - knowing what you've got.

Do a web search for "christmas lights hack" and there's a lot going on.

http://www.dirtside.com/led/hacking.html
The LEDs there are all in series, so it's HV DC (170 V) after the rectifier with his particular product.
He could have hacked the string into more manageable lengths and used a lower voltage supply.
Yours may be different.  
If he had a 170V supply, he could have connected that to the AC plug.
There are high-voltage transistors and MOSFETs.

> > > He provides a link with notes on the LED string that he used (again, yours may be different), explaining their arrangement as made.  He re-arranged them all in series. Anyway, it's not an as-simple-as-falling-off-a-log proposition
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fungus


I plan on running some led christmas lights on a mosfet controled by an arduino so that I can dim them. Will it work?


That depends totally on how the LEDs are wired. It's difficult to see that from here.

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

jameshutton



I plan on running some led christmas lights on a mosfet controled by an arduino so that I can dim them. Will it work?


That depends totally on how the LEDs are wired. It's difficult to see that from here.




Well I would just be hooking it up to led christmas lights the same way you would ac. But just running them with dc instead

fungus


Well I would just be hooking it up to led christmas lights the same way you would ac. But just running them with dc instead


What voltage will it need?

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

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