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Longwei PDS-3010G

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Aldo22:
I bought something cheap again.  :palm:

A Longwei PDS-3010G 30V 10A PSU for CHF 39.- (USD $44.50) delivered.
I haven't found any cheaper 300W PSU.

I didn't expect much but it works so far.

PROS

* 4-digit display. Volt, Ampere and Watt.
* Coarse and fine knobs for A and V separately.
* USB charging socket.
* GND (PE) output.
* It reaches 30V and 10A with reserve (31.7V / 10.24A).
* No overheating problems so far.
NEUTRAL

* The fan is always running, so it's not "smart", but it is very quiet and runs at low speed.
This is probably more pleasant than a fan that keeps turning on and off.
CONS:

* Precise adjustment (4 digits) is difficult even with the "fine" knobs.
* The accuracy is not so good that it would require a 4-digit display.
* In the lower ampere range, the setting cannot be made without a multimeter. You can set the current limit so that you can, for example, power an LED without a resistor, but the display will then be at 0. It can not show as low as 20mA.
* There is no on-off button for the output, but I have not seen any overvoltage when switching on.
* Due to the design (SMPS) there is of course some noise, but I think it is within the normal range (20mV RMS in the example "noise.png").
I'll try to reduce it as shown in the video when the capacitors are here.
A bit concerning: Whether the rear metal parts are grounded (PE) depends on the screw in "screw.jpg".
If this (accidentally) makes electrical contact with the back cover, the parts are grounded, otherwise not.
I scraped off the paint there to ensure contact.

“You get what you pay for”, but yes, it does what I expected and trying to improve cheap stuff is always fun.   ;)

Board Rev:20230518

madires:

--- Quote from: Aldo22 on January 09, 2024, 06:09:58 pm ---A bit concerning: Whether the rear metal parts are grounded (PE) depends on the screw in "screw.jpg".
If this (accidentally) makes electrical contact with the back cover, the parts are grounded, otherwise not.
I scraped off the paint there to ensure contact.

--- End quote ---

I would add a star washer.

Aldo22:

--- Quote from: madires on January 28, 2024, 02:06:24 pm ---I'd would add a star washer.

--- End quote ---

Yes, that's what I plan to do.

tautech:

--- Quote from: Aldo22 on January 09, 2024, 06:09:58 pm ---I bought something cheap again.  :palm:

A Longwei PDS-3010G 30V 10A PSU for CHF 39.- (USD $44.50) delivered.

NEUTRAL

* The fan is always running, so it's not "smart", but it is very quiet and runs at low speed.
This is probably more pleasant than a fan that keeps turning on and off.

--- End quote ---
Now load it to 50% and expect the fan to spin up some.  :popcorn:

Aldo22:

--- Quote from: tautech on January 28, 2024, 07:48:54 pm ---Now load it to 50% and expect the fan to spin up some.  :popcorn:

--- End quote ---

Hmm, so far I've never heard the fan reacting in any way. It always spins at the same speed.
But it keeps the device cool enough, even under prolonged load.

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