AC 110V/220V to DC 5V 40A 200W Universal Regulated Switching Power Supply Adapter Transformer Driver Converter for LED Strip Light, Security Camera System, Computer Project

Because this is stocked at amazon, I cannot say this is the seller. One unit I bought had coffee in it and does not regulate properly. But it works for my usage since it is followed by a buck converter to regulate voltage and amperage. The other unit seems fine. My guess is the questionable unit was returned to amazon and they simply resold it.

Works as advertised. Settable from about 10.5 Vdc to about 13.6 Vdc, delivers 15 amps, runs the cheap car subwoofer amp OK that I picked up to build a bass practice amp out of a 15" speaker and some plywood I had sitting around. If I don't come back and add to this review, then no surprises showed up and and it's just quietly doing its job.[Whoops! A couple weeks later, dead as a doornail. When I unplugged it it was fine - plugged it in again a minute later and no led lit, no DC power out. Didn't smoke or get hot or make noise, just stopped working. Checked the connections, all still ok. Still in the return window, so I didn't mess with it further, just returned it. Replacement due tomorrow. Dropped five stars to four for the inconvenience.]

I order this for my diesel heater. But I see it can be used for alot of thi

You can adjust this to output 14.7v with a a voltmeter and a tiny screwdriver in about 30 seconds.

The box rattled.. Some of the hardware for the two transistors were not attached! Also, there is no way to fasten the two transistors to (the left side of image) as their leads have to be reformed (unsoldered) to reach the case. IProbably there is a slab of aluminum (heat bridge) missing that should have gone behind those transistors. The aluminum bar and a screw was rattling around inside the enclosure..In short, this is junk assembly work and I risk several hundred dollars of electronics to this supply! Into the garbage bin this one goes!

I’m using this to run a diesel heater. It works well.

This is my 3rd purchase. I have 2, (20A) and 1, (50A) and these are the best 12v power supply for the money, period!!! 20A with passive cooling for Diesel heaters in my camper and garage. I have the 50A for charging my chins lifepo4 and could not be happier with results. The fan is quiet, gets warm to touch but certainly not hot, and is adjustable to beyond 14V. WIN!!!

The 12v 15amp specs seem quite accurate. I'm using it to power a 100 watt Ham radio transceiver. It holds well at 12v and drops about 0.4volts on transmit, acceptable. Some of that drop may be due to the external wires from the power supply to the transmitter. Does get slightly warm. Don't recall if it has a fan for cooling. I have yet to determine if there is any radiating RF switching noise flowing back through the 120v AC supply and into house wiring. There is no hum/noise etc on the transceiver speaker (yet). Simple to connect and specs match the advertisement. Like the $15 price! This actually replaces a recently burned out Astron I've used for 20 years, at 1/10 the price! If I find any problem I'll update this review of 11/2020. --- UPDATE: After a few weeks of usage the output voltage dropped to about 5v for no apparent reason. Failure. BW

It smoked and died after couple hours.

Very nice.

Hello im a little disappointed I have purchased this once an it didn’t work at all I don’t know what happened but it wasn’t working once it was hooked up an ready to use.