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/diy/ - Do-It-Yourself


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1794666 No.1794666 [Reply] [Original] [archived.moe]

Just got this PSU from a friend for free to be converted into a cheap lab bench power supply. However, when I try to short the Green and Black wires the unit won't start The unit works fine, was running in a computer prior to me receiving it. I've heard that there may be some sort of protection circuit and/or that the unit requires a dummy load

>> No.1794669

>>1794666
>for free
Why?

>> No.1794673

>>1794669
He got a new one and didn't need this one anymore

>> No.1794676

>>1794673
>He got a new one
Why?

>> No.1794679

>>1794676
idk. I just want to figure out how to jump start it

>> No.1794686

>>1794666
"jump start" is what you do to a car. This aint a car.

>> No.1794706

>>1794666
http://static.highspeedbackbone.net/pdf/ULT-LSP650_Manual.pdf

I would be looking at pin 8 on the motherboard connector. Looks like a shutdown for out of range power situations.

>> No.1794719

>>1794666
Generally they need a dummy load (resistor between the correct pins)
Bought one of these a few years ago and it works really well
https://www.sparkfun.com/products/12867

>> No.1794724

>>1794719
>just looked at the price
Shit, I'm pretty sure I originally got that for way less than twenty bucks.

>> No.1794726

>>1794719
yeah someone else recommended one of those too. Might just go that route and cut my losses

>> No.1794784

>>1794719
>>1794726
You can get these for a couple of bucks from Aliexpress

>> No.1794791

>>1794784
Yep Ebay too

>> No.1795026

>>1794719
Can also be the load. As in, wire up your LED lights or whatever first, then flick the switch. Sees the lights as a viable load, goes.

>> No.1795056

>>1794666
Throw a 5 ohm 10 watt resistor or equivalent between the +5v and ground to create a dummy load. I found it on an instructable and it worked for me when I was making a boombox with an ATX psu.

>> No.1795098

>>1795056
Yeah I was thinking that too. Thanks

>>
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