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Making AC power cable to LED for lamp... Answered

Hello I just recently came across this site and just from browsing a short while i can see this is the place i need to be. I currently have a desk lamp design im in the process of making. Yet i need a light source. I know you can go buy a normal light fixture power cable with socket attached. but i need LEDS. im working with an area about the size of an altoid case that fits inside of a slotted wood piece. I need to find a cheap way to make this. I have seen many led tutorials but have not found anything yet on wiring for plug in ac power source and connecting it to LEDS. Im not sure if there are different resistors or any extra needed pieces that i am unaware of. my skills are fairly basic with leds, yet  i can easily follow good directions and adhere to what is needed. Any help would be great. Thank You

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RickyNY

7 years ago

I see, The thing is i am making a prototype right now for a design that will be gave to others. Im not sure it would be more cost effective to find and buy the wall plug cable and then make my own LED "fixture"? Or are there places that sell a 12v US wall plug with LEDs fixed to them. I mean im sure they are out there but i have yet to find one. Right now i have a walmart desk lamp here that basically when dis assembled is just a plug a long clear coated double silver wire attached to a small green circuit board and square LED 4x4 light attached. in all about the size of a quarter. The lights are actually smaller then the average LED ive seen. And there is a on wire power switch. Yet there are no resistors or anything on it but the light and the cable wire attached.

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caitlinsdadRickyNY

Reply 7 years ago

Those are probably (surface mount devices) SMD LEDs, very difficult to solder by hand for the novice and the resistors look just as small.  The LEDs might be matched to the current coming in.  You can check this out for a start http://www.youtube.com/watch?v=EtbDL0stkRA
 
 Search online for suppliers and ebay for parts, look out for import places which take a loooooong time to ship.  There are plenty of places that specialize in LED lights and power supplies.

p.s. you can use the reply button to reply to a comment otherwise the commenter may not see it has been responded to.

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RickyNYcaitlinsdad

Reply 7 years ago

Thank you for the help. I have another question though. After doing alittle more research i came upon this...... http://www.ebay.com/itm/SMD-SMT-LED-Warm-White-G4-Puck-Disc-Light-Module-12V-AC-DC-10-LEDs-Onboard-/300640512978?pt=LH_DefaultDomain_0&hash=item45ff922bd2#ht_3249wt_1163 .....Too me this looks like exactly something i would need. Its small flat and compact. MY question is will this work? Based on the specs you can see. Are those 2 prongs used for attachment to the wire ends of a 12v ac plug? And This is the what i have found so far but based on the supplies used to make this item, does the price seem fair. Or in range of what i should expect?

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caitlinsdadRickyNY

Reply 7 years ago

The 2 prongs are for power but they connect to a suitable 12v source that can supply the 2 watts of power it uses. You need someone more familiar with electronics to see what kind of transformer is needed to plug into the wall.

As for me, I usually go into the lighting section of a home center or IKEA and cannibalize an existing system such as LED undercabinet lights with power adaptor or use a suitable LED lamp that can be repurposed.

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caitlinsdad

7 years ago

You probably have some spare wall-wart power adapter somewhere that plugs into the wall and outputs 5 - 12 v DC. Look up "led calculator" to see what value resistors you need to use depending on how you hook up your LEDs and the specs on them. Splice the end of the cable into your circuit. Good luck.