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Light emitting diodes (LEDs) are low-voltage light sources that require a constant DC voltage or current to operate optimally. Because they operate on a low-voltage DC power supply, they easily adapt to different power supplies, have longer standby power, and are safer. LEDs require a device that can convert incoming AC power to the proper DC voltage and regulate the current that flows through the LED during operation. This Switching Power Supply LED driver converts 120V 60 Hz AC power to the 12 Volt DC power required by the LEDs and protects them from line-voltage fluctuations. You will be getting 1 Brand New LED Driver Switching Power Supply Transformer from 110 Volt 50-60 hz to 12 Volt DC.
Product Features
- Power 30 Watt, Input Voltage 110 -130 Volt
- Output Voltage 12V DC
- Width 41 mm or 1-5/8″
- Length 200 mm or 8″/ Height 26 mm or 1″
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Works great Nice little power supply. The output measures at 12.07 with no load. But for my use it can make a high pitch humming/buzzing noise if the output is limited below 12 volts. I use this with a 12v dimmer (item #B003L4KKF2) to power some LED ribbons, and when I turn the knob to anything but off or full on the supply makes that noise. I’m not sure if it’s the dimmer or the supply’s fault. The dimmer is PWM (pulse-width modulation), so it switches the voltage on and off at a high frequency, which is probably why the power supply buzzes when the voltage is limited. I’m not sure if this will be annoying in the long run as this supply will be powering some LED strips that will most likely be dimmed. Maybe I’ll just have to find a new 12v dimmer (item #B004AGZSQG) that doesn’t appear to be PWM.UPDATE: I have found and fixed the cause of the humming/buzzing. It was the dimmer’s fault. By putting 2 16v 1000uf capacitors across the input of the dimmer, I was able to reduce the buzzing by 99%. I’m sure the correct value of capacitor will fix it 100%.
A Little Worrisome – Then Satisfaction I ordered this March 22 and received it March 24. Great service there! However, it was as dead as a doornail. I applied to Amazon to get it replaced and guess what – Amazon will only refund on outside vendors merchandise. So, I have to ship this within 24 hours to get my refund and wait another few days to get one that (might) work.If/When I get one that works to power my LEDs, I’ll edit the review and change my Rating.Until then, I give it just one star – for the rapid shipment to me.[Edit 03/31/2011]I thought I had edited this a couple of days ago and came back and it’s not here. HUMPH. I’ll try again!Received the second power supply and this one had 12V as strong as should be. VERY pleased with the quick shipping and now that I have a working power supply, I’m good to go!Cons: Short 12V leads. TOO short. I made do, but it’s a tad frustrating. I don’t know what country these are made in, but instead of the INDUSTRY STANDARD Black/White/Green on the 120V side, the cable is made up of Tan/Blue/Yellow Wire? Who does that? Had to use a meter to verify the conductors.Pros: SOLID construction on the main body of the device. Seems built like a tank!Overall, after all is said and done, I’d buy again. If fact, I know I will. My next project is cabinet lighting.
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