A good, inexpensive PS I''ve found
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Posts: 46,084
all switching power supplies need some kind of load
in this case the circuit you are running with it
but better be carefull and use a fuse to protect from
shorting these supplies can put out some amps enough
to vaporize small circiut traces so be carfull
--- 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:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Fw09mtPfjnQGwJWi0VVqREAA-NckMFr3YTiCaFnMCg775CugLzxdO4xQlFREB_Pogg6DwOe0TTY2glfJKw]jjghost@t...[/url
> 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.
>
>
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>
> [noparse][[/noparse]Non-text portions of this message have been
> removed]
>
>
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in this case the circuit you are running with it
but better be carefull and use a fuse to protect from
shorting these supplies can put out some amps enough
to vaporize small circiut traces so be carfull
--- 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:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Fw09mtPfjnQGwJWi0VVqREAA-NckMFr3YTiCaFnMCg775CugLzxdO4xQlFREB_Pogg6DwOe0TTY2glfJKw]jjghost@t...[/url
> 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/
>
>
__________________________________
Do you Yahoo!?
The New Yahoo! Search - Faster. Easier. Bingo.
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