A good, inexpensive PS I''ve found
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Posts: 46,084
1 amp load on the 5 Volt line will make most (that I have seen anyway)
computer power supplies come up.
Original Message
From: Dave Mucha [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JfsrGDZDvcbRkHhozY9-h1F0YlQgZefWHCcpngyuH04R7LiGm_IxormUHwb7jcHIRWbfYDu210M]davemucha@j...[/url
Sent: Monday, May 12, 2003 6:50 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: A good, inexpensive PS I've found
The newer ATX power supplies need a load to let the monitoring
cirucit turn on the power supply.
older power supplies don't need a load to start.
--- In basicstamps@yahoogroups.com, Sadler Porter
<porter.sadler@s...> wrote:
> Isn't it true that you always need some load on computer power
supplies to
> work/regulate.
> Seem to me I read something about this in N&V some time back. Also how
> would you regulate/limit the current so not to blow
anything or in
> my case blind by the light when (not if) I short something out.
Just can't
> trust us mech types with electricity/
>
>
Original Message
> From: John Boyles [noparse][[/noparse]mailto:jjghost@t...]
> Sent: Monday, May 12, 2003 1:39 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] A good, inexpensive PS I've found
>
> I've noticed a few questions on here about power supplies and
thought I'd
> share an inexpensive solution that I've found works well for me. I
built a
> supply for my own use around a PS taken from an old AT (Pentium or
older)
> computer. The AT supply is a switch-mode supply that easily
provides me
> with a very well regulated high current +5v (~20A, red), +12v (~5A,
yellow),
> and lower current -5v (white), -12v (blue). Blacks are ground.
Usually
> there's a sticker on top of the supply with exact current ratings.
You can
> get other voltages between +12 and -12 with the addition of a simple
> regulator. I wouldn't recommend it for applications requiring very
large
> amounts of power, but it works well for electronics work.
>
> They retail for about $30 (last I checked) but many times you can
just pull
> one out of an old PC you've got lying around. Just be careful when
working
> with the power switch on an AT supply. Remember that it's
switching both
> sides of 120 RMS VAC across its DPDT contacts so use caution when
connecting
> the four wires! (I've got an AT switch with a black scorch mark to
prove
> the point). Also, note that even though the supply has a grounding
wire,
> the chassis still needs to be separately grounded.
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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Subject and
> Body of the message will be ignored.
>
>
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http://docs.yahoo.com/info/terms/
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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computer power supplies come up.
Original Message
From: Dave Mucha [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JfsrGDZDvcbRkHhozY9-h1F0YlQgZefWHCcpngyuH04R7LiGm_IxormUHwb7jcHIRWbfYDu210M]davemucha@j...[/url
Sent: Monday, May 12, 2003 6:50 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: A good, inexpensive PS I've found
The newer ATX power supplies need a load to let the monitoring
cirucit turn on the power supply.
older power supplies don't need a load to start.
--- In basicstamps@yahoogroups.com, Sadler Porter
<porter.sadler@s...> wrote:
> Isn't it true that you always need some load on computer power
supplies to
> work/regulate.
> Seem to me I read something about this in N&V some time back. Also how
> would you regulate/limit the current so not to blow
anything or in
> my case blind by the light when (not if) I short something out.
Just can't
> trust us mech types with electricity/
>
>
Original Message
> From: John Boyles [noparse][[/noparse]mailto:jjghost@t...]
> Sent: Monday, May 12, 2003 1:39 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] A good, inexpensive PS I've found
>
> I've noticed a few questions on here about power supplies and
thought I'd
> share an inexpensive solution that I've found works well for me. I
built a
> supply for my own use around a PS taken from an old AT (Pentium or
older)
> computer. The AT supply is a switch-mode supply that easily
provides me
> with a very well regulated high current +5v (~20A, red), +12v (~5A,
yellow),
> and lower current -5v (white), -12v (blue). Blacks are ground.
Usually
> there's a sticker on top of the supply with exact current ratings.
You can
> get other voltages between +12 and -12 with the addition of a simple
> regulator. I wouldn't recommend it for applications requiring very
large
> amounts of power, but it works well for electronics work.
>
> They retail for about $30 (last I checked) but many times you can
just pull
> one out of an old PC you've got lying around. Just be careful when
working
> with the power switch on an AT supply. Remember that it's
switching both
> sides of 120 RMS VAC across its DPDT contacts so use caution when
connecting
> the four wires! (I've got an AT switch with a black scorch mark to
prove
> the point). Also, note that even though the supply has a grounding
wire,
> the chassis still needs to be separately grounded.
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
>
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject
and Body of the message will be ignored.
Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/