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Anybody know how to hook up LEDs to AC?

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Old 05-22-2013, 11:08 PM   #1
Riverdog [OP] Riverdog is offline
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Anybody know how to hook up LEDs to AC?

I think this is the appropriate forum... Maybe I'll post this in the lighting forum if I don't get a response here.

I'm working on converting an old record player into a clock and adding some LEDs. I've done this once before, but the record player I used before was in better condition than the one I have now. And on that one I just tapped into the existing wiring to power the LEDs. This was my end result:




ALSO! If you know how to make the hands of the clock light up I'd love to hear it!

So moving on, on this second record player, I used a DMM on various locations to try and find a good power source for the LEDs. However, the highest voltage I can find is about 2.6, which I don't think is enough. Also, nothing will work on the record player: the turn table won't turn and the motorized arm doesn't work. Unlike my previous project, my plan this time is to bypass the existing wiring and put in my own. And this is where I need some help.

I don't want to mess with batteries to power the LEDs. I'd like to be able to plug this thing into the wall, flip a switch, and have the LEDs turn on. So if I'm understanding things correctly, I'll need a transformer to make this happen? So I'm thinking it would go like this: power cord to transformer, then transformer to LEDs/resistors. Is that right? I keep reading about transformers and wattage and then I get more confused.

This is the transformer I'm thinking of getting.
This is the switch I'm thinking of getting.
These are the LEDs I already have. I plan on using 24 of them for this project.
These are the resistors I already have.

I used the calculator on led.linear1.org to get this and plan on wiring the LEDs this way:


I basically don't know for sure if I can wire the LEDs safely this way. Can a very wise member with vast knowledge and great experience help me out on this please? Also, can I use the transformer and dimming switch I picked out?
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Old 05-22-2013, 11:23 PM   #2
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TrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shed
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thats neat.
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Old 05-22-2013, 11:50 PM   #3
Riverdog [OP] Riverdog is offline
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Quote:
Originally Posted by TrdSurgie View Post
thats neat.
Thanks! I'm using a Bang & Olufsen Beogram RX2 for this one so it should look a lot more, "neat."

Here's a Beogram RX2
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Old 05-23-2013, 08:06 PM   #4
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TrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shedTrdSurgie is one of the sharper tools in the shed
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Oh cool. I really like the idea of making things useful again.
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Old 05-23-2013, 08:13 PM   #5
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I don't think AC will power the LEDs, so you'll probably have to either construct or purchase a rectifier. If you're not familiar with them, they are 4 diodes that take the AC voltage and turn that into DC voltage. This would occur after the transformer has taken the 120V AC down to 12V AC as the link you provided should do. At this point, you should now have DC voltage coming from the rectifier, I'm not sure if this would be 12V DC or something less than that.
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Old 05-24-2013, 02:54 AM   #6
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You can get a 12V power supply from eBay for about 6 bucks. Roughly the size of a pack of smokes, so it should fit inside, too.
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Old 05-24-2013, 03:10 AM   #7
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I'm doing some home LED strip lighting. To power the 12v dc led strips Im going to use a 110vac to 12vdc converter and wire it straight to the lights. Mine, and yours, shouldn't pull more than 500ma. So i think all you need is a 110vac to 12vdc 500ma converter. im sure you could find an old charger for something laying around and strip it. just read it's sepcs.
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Old 05-24-2013, 05:09 PM   #8
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Thanks guys! After reading through everything here and otther places online I've decided to get one of those LED strips off Amazon like BeeRad has. I think that will be the easiest way to accomplish this. Thanks for the help!!
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Old 06-03-2013, 03:24 PM   #9
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So I finally finished. I ended up going with an LED strip off of Amazon. The strip is RGB LEDs so I can make just about any color I want. Here are some pictures for those of you that are interested. Thanks for the help and suggestions.















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Old 06-03-2013, 05:27 PM   #10
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Dude, thats cool, looks nice
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