Anyone has +/- 5VDC, 0.5A PS, Wall Wart

N

newtype

Guest
Hi, I need a +/- 5VDC, 0.5A PS, Wall Wart sized power supply.
Anyone know of a mfg?

thanks
 
"newtype" <res808c4@earthlink.net> wrote in message
news:Xns9677EA7F3EAF4res808c4earthlinknet@63.218.45.254...
Hi, I need a +/- 5VDC, 0.5A PS, Wall Wart sized power supply.
Anyone know of a mfg?

thanks
Click to expand...
Try http://www.mpja.com
 
"newtype" <res808c4@earthlink.net> wrote in message
news:Xns9677EA7F3EAF4res808c4earthlinknet@63.218.45.254...
Hi, I need a +/- 5VDC, 0.5A PS, Wall Wart sized power supply.
Anyone know of a mfg?

thanks
Click to expand...
DIGIKEY
 
"Walter Harley" <walterh@cafewalterNOSPAM.com> wrote in
news:1aydnfISZsXmQSnfRVn-iQ@speakeasy.net:

"Warren Weber >>>bresnan.net>" <hiviewNO SPAM@> wrote in message
news:WMydnb80Ha7jXynfRVn-qw@bresnan.com...

[...]
Hi, I need a +/- 5VDC, 0.5A PS, Wall Wart sized power supply.
Anyone know of a mfg?


DIGIKEY


Do they? The only Digikey catalog I have handy (a year old) shows only
one +/-5V modular supply, that one being a "table mount" style (rather
than wall wart), for about $50.

They do have some wall warts that are multi-voltage, but I didn't see
any that were +/-5V. Nor did I see any at the place Watson recommended.
(Why am I bothering? Because a while ago I looked for +/-9V wall warts
for a project of my own, and couldn't find any.)

Can you suggest a part number?

Thanks,
-walter harley
Click to expand...
No digi-key, mpja, mouser.
I gave up looking for the +/- 5 wall adapter. Acopian sells one for $135.00.
But too much for my wallet. I went and got two used 9VDC 1 amp wall warts.
I desoldered a 7805 and 7905, look at the Fairchild 7905 PDF. I built my
own +/- 5. been working since friday nite. I think I'll pour fiberglass
resin all over it.
 
"Walter Harley" <walterh@cafewalterNOSPAM.com> wrote in
news:1aydnfISZsXmQSnfRVn-iQ@speakeasy.net:

"Warren Weber >>>bresnan.net>" <hiviewNO SPAM@> wrote in message
news:WMydnb80Ha7jXynfRVn-qw@bresnan.com...

[...]
Hi, I need a +/- 5VDC, 0.5A PS, Wall Wart sized power supply.
Anyone know of a mfg?


DIGIKEY


Do they? The only Digikey catalog I have handy (a year old) shows only
one +/-5V modular supply, that one being a "table mount" style (rather
than wall wart), for about $50.

They do have some wall warts that are multi-voltage, but I didn't see
any that were +/-5V. Nor did I see any at the place Watson recommended.
(Why am I bothering? Because a while ago I looked for +/-9V wall warts
for a project of my own, and couldn't find any.)

Can you suggest a part number?

Thanks,
-walter harley
Click to expand...
No digi-key, mpja, mouser.
I gave up looking for the +/- 5 wall adapter. Acopian sells one for $135.00.
But too much for my wallet. I went and got two used 9VDC 1 amp wall warts.
I desoldered a 7805 and 7905, look at the Fairchild 7905 PDF. I built my
own +/- 5. been working since friday nite. I think I'll pour fiberglass
resin all over it.
 
"newtype" <res808c4@earthlink.net> wrote in message
news:Xns967AEBA6394D4res808c4earthlinknet@63.218.45.254...
I gave up looking for the +/- 5 wall adapter. Acopian sells one for
$135.00.
But too much for my wallet. I went and got two used 9VDC 1 amp wall
warts.
I desoldered a 7805 and 7905, look at the Fairchild 7905 PDF. I built my
own +/- 5. been working since friday nite. I think I'll pour fiberglass
resin all over it.
Click to expand...

When I need a split supply I've generally used an AC/AC adapter and
incorporated a dual half-wave rectifier, filter, and regulator onto my
circuit. But it's a pain, and I would love to find a reasonably priced
dual-supply wall wart.

If you pour fiberglas resin all over your homebrew regulator, give some
thought to heat dissipation. Assuming that your 9V wall warts climb up to
around 11V when they're pushing 0.5A, that means that each of your
regulators is dissipating (11V-5V)*0.5A = 3W. I don't know what the thermal
conductivity of resin is, but a TO220 package in free air is around 50C/W,
meaning that 3W will make it overheat unless it's heat-sinked. If resin is
worse than free air, you've got a problem.
 
"Warren Weber >>>bresnan.net>" <hiviewNO SPAM@> wrote in message
news:WMydnb80Ha7jXynfRVn-qw@bresnan.com...
[...]
Hi, I need a +/- 5VDC, 0.5A PS, Wall Wart sized power supply.
Anyone know of a mfg?


DIGIKEY
Click to expand...

Do they? The only Digikey catalog I have handy (a year old) shows only one
+/-5V modular supply, that one being a "table mount" style (rather than wall
wart), for about $50.

They do have some wall warts that are multi-voltage, but I didn't see any
that were +/-5V. Nor did I see any at the place Watson recommended. (Why
am I bothering? Because a while ago I looked for +/-9V wall warts for a
project of my own, and couldn't find any.)

Can you suggest a part number?

Thanks,
-walter harley
 
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