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HELP:: Power supply question for lab laser (probly easy question) *pics*

swimminsurfer256

swimminsurfer256

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Hey guys,

Finally got a lab laser that requires an analog modulator to run (5V DC). I figured I'd take apart an old computer I made a few years back and use the PSU for this task.

Problem is--the PSU doesn't tell me which color wires are which voltage. Are all wire colors typically the same (e.g. black as ground and red as the +5V)? And I believe I should short pins 3 and 4 in the motherboard rail to get the PSU to turn on, correct?

Here are some pictures:

I've looked online for specifics with none to be had..

IMAG0034.jpg

IMAG0033.jpg





Also,
I'm thinking of cutting this part (below) off and stripping the wires to wrap to the analog wires from the laser power supply. "P9" part was being used but P8 wasn't so I figure if I ever need it again I can just use P8 (which is the part covered by the little black cover--this shouldn't damage anything should it?):
IMAG0035.jpg


Thanks again!
 
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piferal

piferal

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ATX power supplies are:

black (GND) And the yellow +12 Volt

black (GND) And the red +5 Volt

black (GND) And the Orange +3.3 Volt

If you need anything else let me know
 
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swimminsurfer256

swimminsurfer256

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piferal said:
ATX power supplies are:

black (GND) And the yellow +12 Volt

black (GND) And the red +5 Volt

black (GND) And the Orange +3 Volt

If you need anything else let me know
Click to expand...

Thanks that was helpful :)

Is there a -5V? Or should I just use ground for the negative end of the analog part.

And also the second part of my question--it won't be damaging if I cut off the P9 part and strip the wires to connect to the laser power supply right?
 
piferal

piferal

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A −5 V output was originally required because it was supplied on the ISA bus, but it became obsolete with the removal of the ISA bus in modern PCs and has been removed in later versions of the ATX standard.

Only is used the -12 volt (the blue one)

No if the power is off and connect the cables correctly again.
 
swimminsurfer256

swimminsurfer256

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piferal said:
A −5 V output was originally required because it was supplied on the ISA bus, but it became obsolete with the removal of the ISA bus in modern PCs and has been removed in later versions of the ATX standard.

Only is used the -12 volt (the blue one)

No if the power is off and connect the cables correctly again.
Click to expand...

Sounds good thank you for your time and the information :) really helpful!
 
piferal

piferal

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I hope this will also help

You're welcome ;)

Edit: I do not correctly put the 3 volt, is 3.3 volt, I forgot the .3 :)


atxpower.jpg
 
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piferal

piferal

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swimminsurfer256 said:
Hey guys,

And I believe I should short pins 3 and 4 in the motherboard rail to get the PSU to turn on, correct?

Thanks again!
Click to expand...

Be careful that's not right, right is 15 and 16, black and green.

13 and 14 if your connector as 20 pin, however is the black and green
 
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swimminsurfer256

swimminsurfer256

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piferal said:
Congratulations, very good power, beware hahaha:evil:
Click to expand...

Of course I have all these precautions (giant safety goggles, beam catcher, window open, etc) and I accidentally bump into my open PSU and get a nice DC shock X(

Cover's going back on!
 
swimminsurfer256

swimminsurfer256

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piferal said:
:eek: I guess nothing serious?

Enjoy your new laser :beer:
Click to expand...

Never had one of those before :p wayyy different from AC! Doesn't like letting go! Aside from a little adrenaline pump and a tiny bit of lingering soreness in my right arm I'm alright :shhh:

I'll be a bit more careful now :beer:

Putting together a video of this baby now!
 
piferal

piferal

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swimminsurfer256 said:
Never had one of those before :p wayyy different from AC! Doesn't like letting go! Aside from a little adrenaline pump and a tiny bit of lingering soreness in my right arm I'm alright :shhh:

I'll be a bit more careful now :beer:

Putting together a video of this baby now!
Click to expand...

Yes, with these Power supply's must be very careful, in some parts the voltage can reach 300V, and it also work with high frequencies between 20 to 100kHz, and it hurts.

Tomorrow I'll see your "baby" if you put photos or videos ;)

Now I go to sleep is too late :tired:
 
Wolfman29

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Very sexy labby! I wants! I wonder what it's like at night in the sky... probably like a lighthouse :p
 
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