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HELP!!!!!! Question About Powering LEDs

Discussion in 'LEDs and Optoelectronics' started by Alex Hughes, Jan 24, 2018.

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  1. Alex Hughes

    Alex Hughes

    Jan 24, 2018
    So I'm trying to power 70ft of 5050 SMD LEDs. I wanted to make them sync with the beat of the music however, so I bought a separate controller that allows me to do this. I disconnected the wires that went into the original controller and attached them to the new controller which synced to the music. The LED strip barely lit up and I assumed this was because I wasn't able to generate enough power with my 24v power supply. I wanted to test how much voltage the original controller that came with the LEDs outputted to get an idea of the power supply I need to buy. However, when I measured it with my multi-meter I got very confusing results. I got 120v AC when measuring the input, (which makes sense because it's coming directly from the wall outlet) and 0v when I switched it to DC (again this makes perfect sense). When i measured the output voltage of the controller however, I measured 140v DC and 50v when I switched it to AC. How can I possibly get a reading of both AC and DC current? I need to know which reading is the correct one. If anybody can help me it would be VERY much appreciated. Thanks.
  2. Audioguru


    Sep 24, 2016
    You forgot to post a link to the LED strips you have. Ones shown in Google are powered from 12VDC and use 3.7W per foot. Yours might use 3.7W x 70 feet= 259W so they must be wired in separate groups of maybe 30W per group so that the wires do not burn up.
    259W/12V= 21.6A that your power supply probably could not produce.
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