Saturday, March 23, 2013

Reviews Ledwholesalers 30 Watt LED Power Suppply Driver Transformer 120 to 12 Volt DC Output, 3207

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.

This power supply ran cool when powering a 16ft spool of LED tape. My testing ran for most of a day. It is supposedly water sealed, and the construction seems consistent with that claim, but I did not test that feature.

I like that it's a slender, compact power supply, and it doesn't run hot. It should be reasonably easy to tuck it away within my project. It would be nicer for my project if it was flatter, but I can manage without trouble.

I would not run more than 16ft of LED tape from one of these power supplies because it would get too warm for comfort.

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