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Hello i have etched glass and now i want to put leds in the background of the piocture frames. I need to know how to hook the leds circuit up to a normal plug in, so that they dont have to run of batteries. i have an ac ac adaptor it says direct plug in class 2 transformer model 28 - a09- 200, input ac 120v 60Hz 3 w , output ac 9V 200mA and it looks like this so i think the out put would be 9v right so what kind of resitor would i need for by project it will have like almost 20 leds all hooked together so any help wopuld be great and could i just have one resitor then all the other leds hook in seriers (or paralle)

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You can't plug them into a wall socket. You want DC power, and put led's in series. Different color led's also need different voltages.

I would guess with 9v supply you could make sets of 3 in series and connect all sets to power in parallel. But I would check with someone that knows what there talking about first. I'm just guessing.

Edited by isteve
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