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Power mania

 
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Alexander125
HG Master


Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Thu Jan 22, 2009 11:58 am    Post subject: Power mania Reply with quote

I've got a PC power supply that's getting on my nerves.
I made it work by tying a potentiometer between the green( power on wire) and the black(ground).
It's very annoying because I always need that specific potentiometer and the power supply at once.
It's a rare part(cant find it at radio shack) and if I use a resistor it heats up too bad,
So does anyone have an ideea of how to make it work.
And I want to get rid of all those wires( about 50), but the thin cable can't carry all 70 or so amps.
I'll try to make it work before it gets on my nerves for good and i take it apart.
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Fri Jan 23, 2009 11:59 pm    Post subject: Re: Power mania Reply with quote

Alexander125 wrote:
I've got a PC power supply that's getting on my nerves.
I made it work by tying a potentiometer between the green( power on wire) and the black(ground).
It's very annoying because I always need that specific potentiometer and the power supply at once.
It's a rare part(cant find it at radio shack) and if I use a resistor it heats up too bad,
So does anyone have an ideea of how to make it work.
And I want to get rid of all those wires( about 50), but the thin cable can't carry all 70 or so amps.
I'll try to make it work before it gets on my nerves for good and i take it apart.


Hi Alexander,

Sounds like you are using a PC power supply on the bench as a lab supply? Why do you want to use a resistor (or pot) to connect green to black? When the green wire is grounded the supply should turn on so there should be no need for any resistance in that connection.

As far as wires go, have a look at the chart on this page.
http://www.powerstream.com/Wire_Size.htm

Normal supplies have about 30 Amps or so for the 5 volt output and less for the other voltages. Since this wiring would be considered chassis wiring you could use 14 AWG for those short runs.
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Alexander125
HG Master


Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Sun Jan 25, 2009 8:41 am    Post subject: Reply with quote

Hey thank's very much, but on my power supply, 5 V has 32 A, 12V has Another 20, and 3.3 has 22 A, so I need some pretti thick gauge wires.
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Alexander125
HG Master


Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Sun Jan 25, 2009 8:42 am    Post subject: Reply with quote

I tried shorting thee green and the black, but it doesn't work.
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Alexander125
HG Master


Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Sun Jan 25, 2009 8:49 am    Post subject: Reply with quote

so, i Indeed use a pc 400 W power supply as a bench power supply.
It's powerfull, but it only starts when I hold the green and the black together in my hands.
I supose that the wire beying enamailed, can't conduct electricity.
And the current could only travel through my skin.
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sun Jan 25, 2009 1:08 pm    Post subject: Reply with quote

Alexander125 wrote:
Hey thank's very much, but on my power supply, 5 V has 32 A, 12V has Another 20, and 3.3 has 22 A, so I need some pretti thick gauge wires.


Since 14 AWG wire is rated for up to 32 Amps when used in chassis applications you will be fine to use it for all of your supplies since the largest is 32 Amps.

Usually the ground is common, but even if it is run a separate ground conductor from the board to your output connection so that the maximum current through the ground is also 32 Amps.
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Alan
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Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sun Jan 25, 2009 1:23 pm    Post subject: Reply with quote

Alexander125 wrote:
so, i Indeed use a pc 400 W power supply as a bench power supply.
It's powerfull, but it only starts when I hold the green and the black together in my hands.
I supose that the wire beying enamailed, can't conduct electricity.
And the current could only travel through my skin.


Not sure why it doesn't turn on properly when you short green to black. Make sure the connections are stripped clean and try it again. Was this power supply functioning correctly before it was made into a lab supply?
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Alexander125
HG Master


Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Mon Jan 26, 2009 12:31 pm    Post subject: Reply with quote

I realised that by cutting the wires, i sealed the enamail coat, so it was insulating.
It works just fine now, thanks.
I will feed back about some of my experiments.
Hope I get on the main site.
I'd love one of my projects getting on the main site.
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Mon Jan 26, 2009 2:18 pm    Post subject: Reply with quote

Alexander125 wrote:
I realised that by cutting the wires, i sealed the enamail coat, so it was insulating.
It works just fine now, thanks.
I will feed back about some of my experiments.
Hope I get on the main site.
I'd love one of my projects getting on the main site.


Good to hear you got it working. Smile
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Alexander125
HG Master


Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Tue Jan 27, 2009 11:05 am    Post subject: Reply with quote

thank's, you guys are the best.
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Alexander125
HG Master


Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Sat Jan 31, 2009 11:41 am    Post subject: Reply with quote

it seems that that particular power supply has liven it's life.
It's given up the gost with a nice bang and fireworks show.
One of the regulators, the 12 volt one blew up really bad, glad I had the power supply encased.
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sat Jan 31, 2009 3:43 pm    Post subject: Reply with quote

Alexander125 wrote:
it seems that that particular power supply has liven it's life.
It's given up the gost with a nice bang and fireworks show.
One of the regulators, the 12 volt one blew up really bad, glad I had the power supply encased.


Did one of the ouputs get shorted accidentally?
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Alexander125
HG Master


Joined: 13 Jan 2009
Posts: 105
Location: Galati, Romania

PostPosted: Sun Feb 01, 2009 1:57 pm    Post subject: Reply with quote

Yes, but I didn't realise it hadn't got short circuit kill.
so one of the IC-s blew up, nice fireworks though.
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