Budget friendly adjustable bench Power supplies perfect for testing LED's and other uses!

Those brick chargers I listed awhile back are 48V and 3A, which means output may well reach 6A at 20V, and they can certainly reach the + in 20+ but will with less current of course. All assuming they work as advertised. The budget adds up about right with a $10 box and bit and pieces.

I used one of those 48V 3A power supplies for my last DPS3012 and it would handle 12 amps up to around 12 volts or so before it would start dropping voltage.

I was thinking of getting a 24V 10A psu (16:money_mouth_face: for my DPS3012 , any other suggestion ?

That will work fine and it is rare that you would need more then ~22v really anyways.

The Dell sever power supplies posted earlier are the best bang for the buck for sure, great supplies and cheap. Thats what I would recommend as long as the price doesn’t increase.

Thanks

Sounds incredibly good. 12 X 12 is 144 W, 3 X 48 is also 144W. I'm amazed it did so well! Either it's underspecced slightly (as quality things should be) or the DPS is 100% efficient. Either way, the supply specs were not exaggerated.

He said he wanted 6A at 20V. Sounds like it will likely provide 6A even at 24V. A 10A 24V supply obviously will too, but obviously won't go above 24V either. Seems like one of each is the obvious solution :)

IIRC it was somewhere in the 11v range that is actually started dropping voltage but I was never able to really test it properly for more then a few seconds as I didn’t have a way to provide that much load at higher voltages easily.

That said the DPS is 9X% efficiency by mine and others tests.

So that fan doesn't seem to me to be PWM controlled or voltage controlled or throttled at all actually. Mine just turns on at 10A and turns off at 9.5. There is an n channel mostfet (SI2302, says A2sHB on it) connected to the negative lead, but that's not a PWM fan. So that fet is just turning it on or off and leaving it there.

I'd like my case fan to be on all the time probably, and that's easy. Because, being that's an n-channel switch, the positive side of the fan always has 5 volts, so just get the +5 from there and ground from the input supply ground and you have an always on external fan. I was fearing I might have to go digging for 5V on some very tiny solder connections.

What I don't know is is the 10A turn on fixed under all conditions or does it turn on lower under high power? I have a suspicion it's fixed and 10A and 20V is quite a bit of power for now fan. Anyone tried a combination like that?

My fan sure seemed to get louder as the DPS3012 started to heat up. Possible they just turn it on full blast with the 5015 due to the higher power ability though.

Come to think of it the 3012 would kick on around 6A or so IIRC so they must be set up differently.

It will turn on earlier in some cases.

Ok, that's good news. Well, and maybe it will ramp up to higher voltages too. Maybe I jumped the gun on this assessment and just haven't pushed it hard enough yet.

I have not noticed any speed regulation on the fan.

Inside the Dell EPS-470 there is an ATX connector with 12V supply. I’m going to use it to power a 120mm fan.

For those that want to use an ATX or other simular low voltage power supply this same company just released a new buck/boost version of the power supply module.

It outputs 0-32V and the input is 6-40V with a 5A max current.

https://www.aliexpress.com/store/product/RD-DPH3205-Buck-boost-converter-Constant-Voltage-current-Programmable-digital-control-Power-Supply-color-LCD-voltmeter/923042_32760528221.html

This really opens the door for more compact and easier to build power supplies if you do not need the higher current and voltage abilities of the DPS5015

It is on sale during the introduction for $28.99 for 3 days, grab it while you can, they always do this when released and the price DOES go up after that.

Great, glad to see an official test. Basically what I figured it would show.

Please post how those projects go. I already have people asking what can be done with COB’s…

FINALLY
my power supply arrived. :slight_smile:

Tests were done in this thread: Test/review of Power supply frontend DPS5015 50V/15A

Not that hard, the magenta curve shows the power loss in it. The maximum is about 10W in all the test I have done, the only significant exception is when I am very close to the current limit.

Here is the Design for the Acrylic case I made in case anyone wants to make one. It is cut out with a laser cutter from standard hardware store .08” acrylic sheet (“plexiglass”). Thicker acrylic would be stronger but costs a lot more and is much harder to find.

Proper acrylic glue will be stronger and look better but hot glue or super glue works just fine as well.