100-240V to 3-12V 5A Power Supply Adjustable Universal

Purchased this AC/DC because the one I have and use for my nail drill gave out. Took me a bit to find this! The speed on this AC/DC can be adjusted, which is suitable for a nail drill. I’ve owned it for about a year now with zero issues.

I used this for a hot wire cutter & it worked "as is" as long as the wire was long enough. For my use with a 1" wire I added a 3 Ohm resister in series & it works fine.

POSITIVES: very small and nice looking, I like the green display, very handy .Regulation is just ok for this little thing.NO LOAD data: display=4.02 V(good luck in adjustment) ;output jack=3.8 V. 3.5 AMPS (1 ohm load) data: display=3.9V ;output jack=3.5 V so you have at 3.5 Amps , a drop of 0.3 V(10 % regulation) NEGATIVES: Max current is not 5 Amp but ABOUT 3.5 Amp. Full range data: display=11.8 V, load=3 ohms,output jack=11.2 V (3.7Amps) and 11.7 V in no load; so you have at 3.7 A/11.7 V (full range current/voltage) a drop of 0.5 V(about 5% regulation) so regulation is better at higher voltages Case Temperature data at room temp of 78 deg F : For 20 minutes , on 3 ohms load, at 11 V on the output jack(3.6 A), the case temperature got to 108 deg F and the 3 ohm/30W resistors(the load) got to 250 deg F (there are no vents in the case; the case is air tight and the case stays on wood table;not heat conductive then) so I suggest making a lot of small holes all over the case(make sure you remove the guts first, GOOD LUCK!) IF you plan to use this thing at full range voltage/current. , The adjustment is relative continuous(no steps) but very difficult to get anything under 0.5 v variations within the 3.2 to 12.6 volt range. The voltage display is OFF (is bigger 0.2 V average) than the actual voltage on the output jack.

Using this product to charge up car batteries and to power newly-designed circuit boards. The lower end is a 3.06 V and 12.6 V on the high end. So it is good for powering 3.3 V circuitry and charging car batteries too.

Used to regulate a 12v computer fan from 4v to 12v as needed. Knob action feels good and the measured output was more accurate than I expected. Longetivity TBD; hope it does good.

I bought this a while ago, the dial is not in any way precise and within minutes of use it started to heat up intensely and smelled like it was melting. Very unsafe quality.

Hard to set voltage because the adjustment knob is way too sensitive. Also found accuracy of voltage indicator to be off by 0.2 to 0.3 volts.

This is a solid power supply and is perfect for my application.