A good, inexpensive PS I''ve found
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Posts: 46,084
Also,
If I remember correctly from my computer days, they could generate a good
bit of RF from the 120V plug, which could cause havoc with unshielded
circuitry nearby. You could add ferrite beads or get a shielded IEC cable.
Switching supplies can be lightweight, but rather finicky at times.
Mike Sokol
www.modernrecording.com
mikes@m...
Original Message
From: "Dave Mucha" <davemucha@j...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, May 12, 2003 6:50 PM
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/
>
If I remember correctly from my computer days, they could generate a good
bit of RF from the 120V plug, which could cause havoc with unshielded
circuitry nearby. You could add ferrite beads or get a shielded IEC cable.
Switching supplies can be lightweight, but rather finicky at times.
Mike Sokol
www.modernrecording.com
mikes@m...
Original Message
From: "Dave Mucha" <davemucha@j...>
To: <basicstamps@yahoogroups.com>
Sent: Monday, May 12, 2003 6:50 PM
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/
>