Wefomey Universal Power Supply 3V~36V 4A 144W Adjustable
Wefomey Universal Power Supply 3V~36V 4A 144W Adjustable Variable AC/DC Adapter Charger, 100V-240V AC to DC Converter with LED Voltage Display & 14 Tips & Polarity Converter & Test Lead
Package included
1x144W Universal Power Supply Adapter; 14x DC Tips; 1x Reverse Polarity Converter Cable,1x Alligator Clip Test Lead, 1x Male DC Power Pigtail Cable
-Alligator clip test lead is perfect for electrical testing such as electronic experiments, bread boarding, circuit testing, battery test, electric appliance test, digital product power connection test, prototyping, and troubleshooting.
-DC Power Pigtail Cable are widely used in various DC connections, low-voltage cables, CCTV systems, DVRs, car rear-view monitoring system video, and are ideal for home life and work.
-The 17cm short black power cord is a reverse polarity converter, not extension wire. It is used to reverse the original polarity of the power supply output port ( reverse the internal positive pole to negative, and the external negative pole to positive). Please confirm the polarity of your devices’ power port before use. If the positive and negative poles are reversed, it will cause short circuit and damage your device.
Instructions on how to choose a suitable adapter:
1. Check Voltage
Please find the spec label of your device and check the working voltage. It should be among 3V~36V DC, not lower than 3V or higher than 36V DC. Otherwise, your device will not work or be damaged.
2. Check Current
Check the max current your device will draw. It should be equal to or less than 4A, such as 500mA,1A, 1.5A, 2A, 2.5A, 3A, 3.5A, 4A. Otherwise, your device won’t work well and the PS will be damaged very soon.
3. Check Plugs
Check the power input port of your device. The PS is equipped with 14 pcs frequently-used DC tips. Please confirm wether it fits for your device before buy. If you can’t confirm, please measure it with a ruler.
4. Check Original PS
If you have a original power supply for reference, their output voltage, plug size, polarity should be the same . If our PS’s current is equal to or higher than original one’s, then our PS will work with your device.
Working well. I’ve not used a scope on device but it seems to work well on all settings. I particularly like the number of adapter plugs which give a good range of connections, hopefully covering all of your needs.
This is a great little power supply for providing various voltages to random devices you lost the charger to. I found a used camcorder at Goodwill for $5 that didn’t have a power supply. I only needed it for a few weeks while I converted old family videos from High8 to digital. This had the right size barrel connector to swap into it and I dialed in the correct voltage for the camcorder. No muss. No fuss. Completed my project and now I can donate the camera back to Goodwill for someone else to use (but keep this little beauty around).
One thing of note that I wish they’d improve, however: The dial is SUPER touchy. I’m talking “breath on it and it’ll jump by .1V” kind of touchy. I highly recommend dialing in the voltage BEFORE you attach it to anything, as the sweep is very fast and very twitchy until you dial it in.
Model: 3V~24V 5A 120W
Price at time of purchase: 19.86 (included an 8% promotion)
I needed this to resurrect an old laptop which needs 16V & 3.36A in a 5.5mm barrel plug, and this was the cheapest way of achieving it.
I set the output to 16V and then tested it with a multimeter and it agreed with the digital display of the unit.
One thing that was a little weird is that the converter plugs are labelled with letters, but are not arranged alphabetically. Instead they were arranged “A, D, H, D, B, E, F, G, H, L, I, S, A”. Plus, ‘S’ is micro USB, and ‘A’ is USB-C. And there isn’t one labelled ‘C’.
The two plugs marked ‘D’ are not the same. And I thought that the first 4 spelling out “ADHD” was ironic given that it was setting off my OCD.
As others have noted, the “polarity inverter” is wired straight through and is therefore actually a short extension lead.
Anyway, the unit works as advertised. I have no idea how long it will continue to do so and will update this review when I know more.
I will give you one WARNING. The device comes with a six-inch extension output cord that seems to have no use and does not state what it is for. Well, what it does is reverses polarity, so you should never use this unless you are sure your device has the positive power on the outside of the connector, which is very rare. Reversing polarity may fry your device! It’s nice they included it, but there should be a big red label affixed to it that states what it does.
I dinged it a star because the voltage potentiometer (adjustment knob), is way to sensitive and its hard to set the voltage exactly, There are no detents or click in spots for the voltages so you have to fiddle with it and hope the knob doesn’t get bumped to a different voltage during regular use.
Other than that, it’s a keeper.