computer PS and ohm law

[Wandy]

Hi

I am trying to use an atx pc power supply without wasting your time going to
details

There are two type of connectors:
1- One is 10pins x2 raw female connector
2- 3or4 with one raw of four pins (these you hook them to HD, floppy D, etc…

I think all I need is the first one

Green should be connected to ground, now the question
Some suggest using small resistor, where do I hook it

If I need 12V which do I use? Yellow and ??
If I need 5V which do I use? Red and ??
If I need 3.3V which do I use? Orange and ??

can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
resistor so i get 6Amp and so on.

thanks in advance


Jed

 

[Ross Mac]

"Wandy" <Jed@anon.lcs.mit.edu> wrote in message
news:EXCLUSTER2AcgQUgQL200001d64@EXCH2KCL.nesma.net.sa...
Hi

I am trying to use an atx pc power supply without wasting your time going to
details

There are two type of connectors:
1- One is 10pins x2 raw female connector
2- 3or4 with one raw of four pins (these you hook them to HD, floppy D, etc.

I think all I need is the first one

Green should be connected to ground, now the question
Some suggest using small resistor, where do I hook it

If I need 12V which do I use? Yellow and ??
If I need 5V which do I use? Red and ??
If I need 3.3V which do I use? Orange and ??

can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
resistor so i get 6Amp and so on.

thanks in advance


Jed
That should be fine but make sure to use the power equation P=IE so you pick
the correct wattage! It seems to me that 6amps at 12 volts is going to need
at least a 72 watt, or the next size up, resistor....Why don't you just fuse
it if you are worried about overdrawing the supply.
That resistor would be quite large......Probably a 2 ohm 100 watt!!
For the wire colors...I would just do a Google search...
good luck on your project....Ross

 

[Ross Mac]

"Wandy" <Jed@anon.lcs.mit.edu> wrote in message
news:EXCLUSTER2AcgQUgQL200001d64@EXCH2KCL.nesma.net.sa...
Hi

I am trying to use an atx pc power supply without wasting your time going to
details

There are two type of connectors:
1- One is 10pins x2 raw female connector
2- 3or4 with one raw of four pins (these you hook them to HD, floppy D, etc.

I think all I need is the first one

Green should be connected to ground, now the question
Some suggest using small resistor, where do I hook it

If I need 12V which do I use? Yellow and ??
If I need 5V which do I use? Red and ??
If I need 3.3V which do I use? Orange and ??

can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
resistor so i get 6Amp and so on.

thanks in advance


Jed
One other thing here...if you are attempting to use this resistor as a
current limiting device the calculation would be much different. Since the
drop accross the resistor would depend on the internal resistance of the
load. If you are just putting the resistor accross the supply, than 72 watts
is it. If the resistor has .1 volts accross it then you would only need a 10
watt resistor....I wasn't very clear on what you were trying to do here!

 

[Ken Taylor]

"Wandy" <Jed@anon.lcs.mit.edu> wrote in message
news:EXCLUSTER2AcgQUgQL200001d64@EXCH2KCL.nesma.net.sa...

Hi

I am trying to use an atx pc power supply without wasting your time going
to
details

There are two type of connectors:
1- One is 10pins x2 raw female connector
2- 3or4 with one raw of four pins (these you hook them to HD, floppy D,
etc.

I think all I need is the first one

Green should be connected to ground, now the question
Some suggest using small resistor, where do I hook it

If I need 12V which do I use? Yellow and ??
If I need 5V which do I use? Red and ??
If I need 3.3V which do I use? Orange and ??

can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
resistor so i get 6Amp and so on.

thanks in advance

Jed

Hi Jed.

What are people suggesting you use a resistor for? You *may* need to put a
minimum load onto the +5V output so that it will regulate properly (or maybe
even turn on at all). However you do not need a resistor to draw a
particular current - if your load will draw 6 Amps, it will draw 6 Amps (as
long as the power supply can cope).

One or more of the wires on the connector(s) will go to ground, which you
will find will connect with the blacks on the FDD/HDD cables - use a
multimeter to find out which one(s) this is. The outputs are between the
various outputs and this earth.

Cheers.

Ken

 

[Richard Crowley]

"Wandy" wrote ...

Green should be connected to ground, now the question
Some suggest using small resistor, where do I hook it

Who suggested it? For what?

When I searched for "atx pinout color", I found many
web pages that have exactly the info you are asking for.
This question would have been answered quicker by
learning to use web search engines than by posting it
here,.

This page http://www.laserlab.com/atx_ps_connector.php
says that you directly ground pin 14 (the green wire) to start
the power supply.

No mention of any resistor (unless it is to provide the
MINIMUM 5V load.)

Note that color codes are not necessarily standard.
Pin connections ARE standard and you should work
back from those.

If I need 12V which do I use? Yellow and ??
If I need 5V which do I use? Red and ??
If I need 3.3V which do I use? Orange and ??

Black is usually the common ground for ALL voltages.

can i use ohm law if using the 12V, would it be ok
to use 10wat 2Ohm resistor so i get 6Amp and so on.

Huh? What are you trying to do?

 

[DarkMatter]

On Thu, 18 Dec 2003 22:46:34 GMT, "Ross Mac"
<this.is.a.mung@example.invalid> Gave us:

Jed
That should be fine but make sure to use the power equation P=IE so you pick
the correct wattage! It seems to me that 6amps at 12 volts is going to need
at least a 72 watt, or the next size up, resistor....Why don't you just fuse
it if you are worried about overdrawing the supply.
That resistor would be quite large......Probably a 2 ohm 100 watt!!
For the wire colors...I would just do a Google search...
good luck on your project....Ross

For somebody that claims to have been on the net as long as you
have, you don't know a damned thing about how to quote previous texts.

Get a real news reader, ya retard.
]
Outhouse Express ain't it. Fucking retards, all of you OE users..

 

[DarkMatter]

On Thu, 18 Dec 2003 23:03:23 GMT, "Ross Mac"
<this.is.a.mung@example.invalid> Gave us:

Jed

Then... your LAME ass double posted it. Oh boy... you really ARE
experienced on the net... Not!

You aren't a "years experienced" net user, you are a fucking net
twit, just like I said you were, the first time I did... Months ago.

 

[DarkMatter]

On Fri, 19 Dec 2003 13:32:34 +1300, "Ken Taylor" <ken123@xtra.co.nz>
Gave us:

Hi Jed.

What are people suggesting you use a resistor for? You *may* need to put a
minimum load onto the +5V output so that it will regulate properly (or maybe
even turn on at all).

Absolutely true.

 

[The little lost angel]

On Fri, 19 Dec 2003 01:12:52 +3, "Wandy" <Jed@anon.lcs.mit.edu> wrote:

Green should be connected to ground, now the question
Some suggest using small resistor, where do I hook it

Usually on the +5V. This is because cheap ATX PSU will not work
properly without a minimum load on the +5V. More expensive ones, I
don't have any problem starting them and using them without a +5V
load.

However, most ATX PSU cross regulate on the +5V and +12V so if you are
going to draw quite a bit of power on the +12V, you will need a load
on the +5V to keep the +12V voltage up.

If I need 12V which do I use? Yellow and ??
If I need 5V which do I use? Red and ??
If I need 3.3V which do I use? Orange and ??

All with the black ground wires.

can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
resistor so i get 6Amp and so on.

6 Amps x 12 = 72 Watts, that 10W resistor will burn out pretty quickly
Or parallel connect 10x 20 Ohmz 10W.

You might wanna look at some of these things I've been looking at for
that kind of purposes.

http://www.brakingresistor.com/metal.htm

I'm not recommending them as good or bad, I don't know. But these
things appear to be only ones suitable for high loads on the +12V.

--
L.Angel: I'm looking for web design work.
If you need basic to med complexity webpages at affordable rates, email me
Standard HTML, SHTML, MySQL + PHP or ASP, Javascript.
If you really want, FrontPage & DreamWeaver too.
But keep in mind you pay extra bandwidth for their bloated code

 

[Ross Mac]

"DarkMatter" <DarkMatter@thebarattheendoftheuniverse.org> wrote in message
news:jrm4uvgfeklt4todm5podfrfd500sftmg1@4ax.com...

On Thu, 18 Dec 2003 22:46:34 GMT, "Ross Mac"
this.is.a.mung@example.invalid> Gave us:

Jed
That should be fine but make sure to use the power equation P=IE so you
pick
the correct wattage! It seems to me that 6amps at 12 volts is going to
need
at least a 72 watt, or the next size up, resistor....Why don't you just
fuse
it if you are worried about overdrawing the supply.
That resistor would be quite large......Probably a 2 ohm 100 watt!!
For the wire colors...I would just do a Google search...
good luck on your project....Ross


For somebody that claims to have been on the net as long as you
have, you don't know a damned thing about how to quote previous texts.

Get a real news reader, ya retard.
]
Outhouse Express ain't it. Fucking retards, all of you OE users..
Our childish Usenet Prick is back!.....You must have something better to do

than this!

 

[Ross Mac]

"DarkMatter" <DarkMatter@thebarattheendoftheuniverse.org> wrote in message
news:gvm4uvg0n1f20ralomou1vp85c4t8gcv7m@4ax.com...

On Thu, 18 Dec 2003 23:03:23 GMT, "Ross Mac"
this.is.a.mung@example.invalid> Gave us:


Jed

Then... your LAME ass double posted it. Oh boy... you really ARE
experienced on the net... Not!

You aren't a "years experienced" net user, you are a fucking net
twit, just like I said you were, the first time I did... Months ago.
I don't see a double post here....drunk again and seeing double....You

really should lay off the sauce kid!

 

[Rheilly Phoull]

"Wandy" <Jed@anon.lcs.mit.edu> wrote in message
news:EXCLUSTER2AcgQUgQL200001d64@EXCH2KCL.nesma.net.sa...
Hi

I am trying to use an atx pc power supply without wasting your time going to
details

There are two type of connectors:
1- One is 10pins x2 raw female connector
2- 3or4 with one raw of four pins (these you hook them to HD, floppy D, etc.

I think all I need is the first one

Green should be connected to ground, now the question
Some suggest using small resistor, where do I hook it

If I need 12V which do I use? Yellow and ??
If I need 5V which do I use? Red and ??
If I need 3.3V which do I use? Orange and ??

can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm
resistor so i get 6Amp and so on.

thanks in advance


Jed

All the power and volts stuff aside, you have to ground the "Power good" pin
on the long connecting plug. Its pin #14, most likely green.
go here, it's a good source !
http://www.hardwarebook.net/connector/power/atxpower.html


--
Regards ............... Rheilly Phoull

 

[DarkMatter]

On Fri, 19 Dec 2003 05:43:24 GMT, "Ross Mac"
<this.is.a.mung@example.invalid> Gave us:

"DarkMatter" <DarkMatter@thebarattheendoftheuniverse.org> wrote in message
news:jrm4uvgfeklt4todm5podfrfd500sftmg1@4ax.com...
On Thu, 18 Dec 2003 22:46:34 GMT, "Ross Mac"
this.is.a.mung@example.invalid> Gave us:

Jed
That should be fine but make sure to use the power equation P=IE so you
pick
the correct wattage! It seems to me that 6amps at 12 volts is going to
need
at least a 72 watt, or the next size up, resistor....Why don't you just
fuse
it if you are worried about overdrawing the supply.
That resistor would be quite large......Probably a 2 ohm 100 watt!!
For the wire colors...I would just do a Google search...
good luck on your project....Ross


For somebody that claims to have been on the net as long as you
have, you don't know a damned thing about how to quote previous texts.

Get a real news reader, ya retard.
]
Outhouse Express ain't it. Fucking retards, all of you OE users..
Our childish Usenet Prick is back!.....You must have something better to do
than this!

Damn..... he actually quoted correctly this time!

 

[DarkMatter]

On Fri, 19 Dec 2003 05:45:28 GMT, "Ross Mac"
<this.is.a.mung@example.invalid> Gave us:

"DarkMatter" <DarkMatter@thebarattheendoftheuniverse.org> wrote in message
news:gvm4uvg0n1f20ralomou1vp85c4t8gcv7m@4ax.com...
On Thu, 18 Dec 2003 23:03:23 GMT, "Ross Mac"
this.is.a.mung@example.invalid> Gave us:


Jed

Then... your LAME ass double posted it. Oh boy... you really ARE
experienced on the net... Not!

You aren't a "years experienced" net user, you are a fucking net
twit, just like I said you were, the first time I did... Months ago.
I don't see a double post here....drunk again and seeing double....You
really should lay off the sauce kid!

Hey, dipshit... Yeah YOU. You replied to the guy twice, or you
posted the reply twice. Usenet doesn't make mistakes. YOU did.

Shall I provide posting ID numbers, ya retard?

 

[Ross Mac]

"DarkMatter" <DarkMatter@thebarattheendoftheuniverse.org> wrote in message
news:if16uvgtvn5ack39qr6cd6rai4fr78vmu0@4ax.com...

On Fri, 19 Dec 2003 05:45:28 GMT, "Ross Mac"
this.is.a.mung@example.invalid> Gave us:


"DarkMatter" <DarkMatter@thebarattheendoftheuniverse.org> wrote in
message
news:gvm4uvg0n1f20ralomou1vp85c4t8gcv7m@4ax.com...
On Thu, 18 Dec 2003 23:03:23 GMT, "Ross Mac"
this.is.a.mung@example.invalid> Gave us:


Jed

Then... your LAME ass double posted it. Oh boy... you really ARE
experienced on the net... Not!

You aren't a "years experienced" net user, you are a fucking net
twit, just like I said you were, the first time I did... Months ago.
I don't see a double post here....drunk again and seeing double....You
really should lay off the sauce kid!


Hey, dipshit... Yeah YOU. You replied to the guy twice, or you
posted the reply twice. Usenet doesn't make mistakes. YOU did.

Shall I provide posting ID numbers, ya retard?
Time for you to go back where you came from... alt.drugs.pot ....keep

swallowing the bong water boy!

 

[Ross Mac]

"DarkMatter" <DarkMatter@theangrylittledickwithears.org> wrote in message
news:if16uvgtvn5ack39qr6cd6rai4fr78vmu0@4ax.com...

On Fri, 19 Dec 2003 05:45:28 GMT, "Ross Mac"
this.is.a.mung@example.invalid> Gave us:


"DarkMatter" <DarkMatter@theangrylittledickwithears.org> wrote in message
news:gvm4uvg0n1f20ralomou1vp85c4t8gcv7m@4ax.com...
On Thu, 18 Dec 2003 23:03:23 GMT, "Ross Mac"
this.is.a.mung@example.invalid> Gave us:


Jed

Then... your LAME ass double posted it. Oh boy... you really ARE
experienced on the net... Not!

You aren't a "years experienced" net user, you are a fucking net
twit, just like I said you were, the first time I did... Months ago.
I don't see a double post here....drunk again and seeing double....You
really should lay off the sauce kid!


Hey, dipshit... Yeah YOU. You replied to the guy twice, or you
posted the reply twice. Usenet doesn't make mistakes. YOU did.

Shall I provide posting ID numbers, ya retard?

Uhhh....the ID numbers are different as are the posts...
I just saw you quadruple post alt.engineering.electrical (under you own
definition anyway!)...
You really are a sick individual... You expect everybody to post exactly
like you do with exactly the same newreader.... You sure live a pathetic
life! I would still recommend a few good 12 step programs for you... One for
anger management and the others for your drug and alcohol problem!
You mentioned I had only been on the newsgroups for a few months....not
true....I have been away for a few years but had a copy of Agent back in 95
and used to be quite active. My first access to the internet was with the
old unix command prompt. I guess you just do a google search and begin the
vitreol....Your lack of accuracy is well known kid....and your claims are
wild and unsubstantiated. I have seen posts of you claiming to be a
descendant of 2 presidents, having put up many a ham radio tower, delivering
medical marijuana, you have a conformal coating fetish, you are a circuit
board expert who never was in the business for even a day and let's not
forget that you are the biggest and baddest with the largest prick . Now
that I believe since you are ALL DICK!. You even posted the Apollo mission
to the moon was hoax!.
I suspect there are a couple hundred engineers that might like to talk to
you about that piece of brilliance!
So if anyone here is a "net twit".....well look in the mirror "Don'tMatter"
and stop swallowing the bong water doper boy!

 

[Wandy]

I was going to post a question on this.

1- If I need 12V do i use Yellow and black from the 20pins Connectors direct
or should i use the 4 pins (ie hard disk Connectors) ?

2- As i am going to use it to charge 12v battery, does the proposed idea of using
resistor would post up the volt to 13.8V? you needed two resistors in series
1 ohm+ 0.15 ohm).

thanx

Ian

Hi

I am trying to use an atx pc power supply without wasting your time going to details

There are two type of connectors: 1- One is 10pins x2 raw female connector 2- 3or4 with
one raw of four pins (these you hook them to HD, floppy D, etc…

I think all I need is the first one

Green should be connected to ground, now the question Some suggest using small resistor,
where do I hook it

If I need 12V which do I use? Yellow and ?? If I need 5V which do I use? Red and ?? If I
need 3.3V which do I use? Orange and ??

can i use ohm law if using the 12V, would it be ok to use 10wat 2Ohm resistor so i get
6Amp and so on.

thanks in advance


Jed

 

[Peter Bennett]

On Fri, 19 Dec 2003 23:44:05 +3, "Wandy" <Jed@anon.lcs.mit.edu> wrote:

I was going to post a question on this.


2- As i am going to use it to charge 12v battery, does the proposed idea of using
resistor would post up the volt to 13.8V? you needed two resistors in series
1 ohm+ 0.15 ohm).

You cannot charge a 12 volt battery from a 12 volt power supply - the
charging voltage must be a little higher than the battery voltage.

For a lead-acid "12 volt" battery, a fully charged battery will be
about 13.6 volts, and a battery charger will normally produce about
14.4 volts


--
Peter Bennett VE7CEI
email: peterbb (at) interchange.ubc.ca
GPS and NMEA info and programs: http://vancouver-webpages.com/peter/index.html
Newsgroup new user info: http://vancouver-webpages.com/nnq

 

[Richard Crowley]

"Peter Bennett" <peterbb@nowhere.invalid> wrote in message
news:3c17uvkgtqnl1ffdh3skmshs6i8tpakoq6@4ax.com...

On Fri, 19 Dec 2003 23:44:05 +3, "Wandy" <Jed@anon.lcs.mit.edu> wrote:

I was going to post a question on this.


2- As i am going to use it to charge 12v battery, does the proposed
idea of using
resistor would post up the volt to 13.8V? you needed two resistors in
series
1 ohm+ 0.15 ohm).


You cannot charge a 12 volt battery from a 12 volt power supply - the
charging voltage must be a little higher than the battery voltage.

For a lead-acid "12 volt" battery, a fully charged battery will be
about 13.6 volts, and a battery charger will normally produce about
14.4 volts

Furthermore, using a resistor will not "post up" (whatever
that means?) the voltage. Unless you are modifying the PS
internally somehow (and your questions indicate that you
likely shouldn't be messing around inside the PS for your
own safety!)

 

[DarkMatter]

On Fri, 19 Dec 2003 18:02:52 GMT, "Ross Mac"
<this.is.a.mung@example.invalid> Gave us:

Uhhh....the ID numbers are different as are the posts...

Look, dipshit, you replied to the guy, but you posted the reply
twice.

Nothing you can do will change that fact.

I just saw you quadruple post alt.engineering.electrical (under you own
definition anyway!)...

No. You didn't. By any definition. You didn't *see* me do a
goddamned thing, boy.

You really are a sick individual... You expect everybody to post exactly
like you do with exactly the same newreader....

No, dipshit. I expect you to suck up the same scrutiny that your
lame ass heaps out. Except that you don't know what the fuck you are
talking about, nd you still feel the 12 year old need to post up a
retarded song occasionally. How mature.... not.

You sure live a pathetic
life! I would still recommend a few good 12 step programs for you... One for
anger management and the others for your drug and alcohol problem!

What anger? What drugs and alcohol? You're a goddamned idiot.

You mentioned I had only been on the newsgroups for a few months....not
true....

No. I said that you only knew about headers for a few months, you
fucking retard.

I have been away for a few years but had a copy of Agent back in 95
and used to be quite active. My first access to the internet was with the
old unix command prompt.

We fdon\t need your "I was the first AOL customer" retarded baby
bullshit again, dipass.

I guess you just do a google search and begin the
vitreol....Your lack of accuracy is well known kid....and your claims are
wild and unsubstantiated. I have seen posts of you claiming to be a
descendant of 2 presidents,

I am. I'd bet that you cannot make such a claim. My blood makes
the claim for me.

You couldn't be any more retarded.

having put up many a ham radio tower,

I have.

delivering
medical marijuana,

Nope. I actually farm the stuff. I am a care provider, not a
delivery boy, dipshit. Big difference.

you have a conformal coating fetish,

No, I use conformal coatings on JHV assemblies, because it seals out
moisture in the PCB, and gives the assembly years more life, and
reliability.

Could you be any more retarded? I think not.

you are a circuit
board expert who never was in the business for even a day

When you integrate 13kV capacitors into the sub-surface layers of a
PCB assembly using polymide insulative layers, and eliminate the cost
of 6 or 8 capacitors in a 50M piece order, saving the company a half
million dollars for each penny saved, you can brag about it. Until
then, you are just another little punk that used to crank a few
boards.

and let's not
forget that you are the biggest and baddest with the largest prick . Now
that I believe since you are ALL DICK!.

To you.... sure...

You even posted the Apollo mission
to the moon was hoax!.

No, dipshit. I did not. I have always posted AGAINST those
retards, just like I post AGAINST your lame, retarded ass.

I suspect there are a couple hundred engineers that might like to talk to
you about that piece of brilliance!

YOu are a fucking retard boy. I watched every launch. I have
models of the Saturn 5 booster, and Apollo mission modules.

You're a fucking idiot. I never posted against the moon missions,
dipshit.

Put up the post ID, fuckhead. I'll prove you wrong.

I can also cite years worth of posts in other groups that show I put
down the hoax retards, just like I put down your retarded ass.
You are as bad as any of those cranks ever could be.

You failed miserably the last time you "searched up" my posts, and
you did again here, dipshit. Get a clue.

So if anyone here is a "net twit".....well look in the mirror "Don'tMatter"
and stop swallowing the bong water doper boy!

You're an idiot. You're a dumbfuck. You are so stupid, you can't
even tell what I have or have not posted. That is pretty bad,
considering that it is public record. You need to upgrade your
ability to waste time, digging up "my" posts on the net. You are
doing a sad job of it so far.

You be 'tard, boy.