ATX kludge

S

Stumpy

Guest
I will be visiting Fry's electronics or Radio Shack on Tuesday. Need to
make a list of parts to use an old ATX power supply for 12V cigarette
lighter projects.

http://www.frys.com/product/6269850?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/1916056?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/472305?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/2860274?site=sr:SEARCH:MAIN_RSLT_PG

I'm copying this guy.

http://www.scary-terry.com/atxps/atxps.htm

But am going to put the switch, resistor, and lighter plug on the ATX 20-pin
extension cable so I can switch out power supplies when I blow one up. Good
plan?
 
"Stumpy" <perilmung@spamnet.corn> wrote in
news:8oednefEW5GkYgnOnZ2dnUVZ_q2dnZ2d@earthlink.com:

I will be visiting Fry's electronics or Radio Shack on Tuesday. Need
to make a list of parts to use an old ATX power supply for 12V
cigarette lighter projects.

http://www.frys.com/product/6269850?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/1916056?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/472305?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/2860274?site=sr:SEARCH:MAIN_RSLT_PG

I'm copying this guy.

http://www.scary-terry.com/atxps/atxps.htm

But am going to put the switch, resistor, and lighter plug on the ATX
20-pin extension cable so I can switch out power supplies when I blow
one up. Good plan?
Click to expand...

You probably haven't got enough current carrying capability on a single
pin of the ATX connector, so it is likely to burn up the connector if you
run a high current load for long at the lighter socket . I'd want to
use at least three of the old style hard drive power connectors in
parallel to feed the socket.

--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk
[at]=@, [dash]=- & [dot]=. *Warning* HTML & >32K emails --> NUL
 
I'm copying this guy.

http://www.scary-terry.com/atxps/atxps.htm

But am going to put the switch, resistor, and lighter plug on the ATX
20-pin extension cable so I can switch out power supplies when I blow
one up. Good plan?

You probably haven't got enough current carrying capability on a single
pin of the ATX connector, so it is likely to burn up the connector if you
run a high current load for long at the lighter socket . I'd want to
use at least three of the old style hard drive power connectors in
parallel to feed the socket.
Click to expand...

OK. The P.S. is rated at 12 amps on the +12v and the fuse on a similar
cigarette lighter is 8Amp, 250V

The IDE HDD power connectors do look beefier, I'll try one by itself first.
 
"Stumpy" <perilmung@spamnet.corn> wrote in message
news:Q_2dnf_0pt26ggjOnZ2dnUVZ_sWdnZ2d@earthlink.com...
I'm copying this guy.

http://www.scary-terry.com/atxps/atxps.htm

But am going to put the switch, resistor, and lighter plug on the ATX
20-pin extension cable so I can switch out power supplies when I blow
one up. Good plan?

You probably haven't got enough current carrying capability on a single
pin of the ATX connector, so it is likely to burn up the connector if you
run a high current load for long at the lighter socket . I'd want to
use at least three of the old style hard drive power connectors in
parallel to feed the socket.


OK. The P.S. is rated at 12 amps on the +12v and the fuse on a similar
cigarette lighter is 8Amp, 250V

The IDE HDD power connectors do look beefier, I'll try one by itself
first.
Click to expand...

One by itself still means one single wire for +12V, no better than the ATX.
Actually worse, since you only have 2 GND wires going to a HDD connector.

"At least 3" was a much better idea. Better still, use the ATX one as well
and connect all the GNDs together. That way you won't get a voltage drop
with a high current capacity to Earth Ground in your circuit. These can
mess up instrumentation (think scope probe grounds) and other connected
circuits in unpredictable and unpleasant ways.

Regards
Dimitrij
 
On Sunday, June 8, 2014 5:26:31 PM UTC-7, Stumpy wrote:
I will ... use an old ATX power supply for 12V cigarette
lighter projects.

But am going to put the switch, resistor, and lighter plug on the ATX 20-pin
extension cable so I can switch out power supplies when I blow one up. Good
plan?
Click to expand...

Better plan might include several 12V sockets, with different resettable
circuit breakers, for current limits other than all-the-power-available.
There's other things than the power supply that might blow up.
 
You probably haven't got enough current carrying capability on a single
pin of the ATX connector, so it is likely to burn up the connector if
you
run a high current load for long at the lighter socket . I'd want to
use at least three of the old style hard drive power connectors in
parallel to feed the socket.


OK. The P.S. is rated at 12 amps on the +12v and the fuse on a similar
cigarette lighter is 8Amp, 250V

The IDE HDD power connectors do look beefier, I'll try one by itself
first.

One by itself still means one single wire for +12V, no better than the
ATX.
Actually worse, since you only have 2 GND wires going to a HDD connector.

"At least 3" was a much better idea. Better still, use the ATX one as well
and connect all the GNDs together. That way you won't get a voltage drop
with a high current capacity to Earth Ground in your circuit. These can
mess up instrumentation (think scope probe grounds) and other connected
circuits in unpredictable and unpleasant ways.
Click to expand...

I was going to use the connector for ease of swapping out power supplies.
If I connect all the yellows and all the blacks together it's a one trick
pony. I am assuming that my cheap, old power supplies are single rail and
that the wires I see can handle up to 12 amps. If it fails, I certainly
would tie them all together.
 
On Sun, 8 Jun 2014 17:26:31 -0700, "Stumpy" <perilmung@spamnet.corn> wrote:

I will be visiting Fry's electronics or Radio Shack on Tuesday. Need to
make a list of parts to use an old ATX power supply for 12V cigarette
lighter projects.

http://www.frys.com/product/6269850?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/1916056?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/472305?site=sr:SEARCH:MAIN_RSLT_PG

http://www.frys.com/product/2860274?site=sr:SEARCH:MAIN_RSLT_PG

I'm copying this guy.

http://www.scary-terry.com/atxps/atxps.htm

But am going to put the switch, resistor, and lighter plug on the ATX 20-pin
extension cable so I can switch out power supplies when I blow one up. Good
plan?
Click to expand...

Smoking will kill you. Bad plan.


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation
 
You probably haven't got enough current carrying capability on a single
pin of the ATX connector, so it is likely to burn up the connector if you
run a high current load for long at the lighter socket . I'd want to
use at least three of the old style hard drive power connectors in
parallel to feed the socket.
Click to expand...

I'll add a few Molex 8981 male pin, female connectors to my list and can
still do a modular swap.

http://www.frys.com/product/6252560?site=sr:SEARCH:MAIN_RSLT_PG

Maybe they will have the Molex end of this cable sitting in a bin.
 
But am going to put the switch, resistor, and lighter plug on the ATX
20-pin
extension cable so I can switch out power supplies when I blow one up.
Good
plan?

Better plan might include several 12V sockets, with different resettable
circuit breakers, for current limits other than all-the-power-available.
There's other things than the power supply that might blow up.
Click to expand...

Right. Can't even get to that point. Somebody raided my storage closet, or
cleaned it up. Only have 2 P.S. left. The Hopely (from a windows 95 box)
made in ShenZhen just lays there. The Bestec which does have two 12v rails
did some smoking on power-up. It gives a momentary pulse of 12v, then shuts
off. I added a second 10ohm resistor to the +5v in case the sensing circuit
is just cranky - no change.

I only spent $12.27 +tax but am unwilling to risk any of the installed P.S.
Guess I have to wait until one of my Windows XP motherboards fails to try
this again.
 
On Tuesday, June 10, 2014 7:07:11 PM UTC-7, Stumpy wrote:

I only spent $12.27 +tax but am unwilling to risk any of the installed P.S.

Guess I have to wait until one of my Windows XP motherboards fails to try
this again.
Click to expand...

Here's another option:

<http://www.dx.com/p/48w-switching-power-supply-black-ac-100-240v-287562>
 
"whit3rd" <whit3rd@gmail.com> wrote in message
news:53785d41-d714-41c0-b630-8f53d88eef67@googlegroups.com...
On Tuesday, June 10, 2014 7:07:11 PM UTC-7, Stumpy wrote:

I only spent $12.27 +tax but am unwilling to risk any of the installed
P.S.

Guess I have to wait until one of my Windows XP motherboards fails to try
this again.

Here's another option:

http://www.dx.com/p/48w-switching-power-supply-black-ac-100-240v-287562
Click to expand...

Only 4 Amps might not light a stogie. It is nice and compact though, less
expensive than my parts.
 
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