Hmm, I didn't really look at the 5 volt specs. I'll do that.


"Paul Keinanen" wrote in message
...
On Sun, 1 Feb 2004 11:30:10 -0600, "Charlie"
wrote:


He says he needs 35 volt power supply with 35 amps.

So if I wire together 12 power supplys (12v, 9a), voila, 36 volts at 36
amps.

You might take seven identical power supplies, each capable of
delivering at least 35 A from the 5 V line and connect them in series.
However, you would have to disconnect the 0 V DC from chassis on each
unit, so that the chassis of each power supply can be connected to the
protective ground.

If these are ATX power supplies, you would have to look at the startup
sequence, if these power supplies do not go on-line, when the mains is
applies. This may require some optoisolators.

Paul OH3LWR

Thanks for your thoughts. I'll give Marlin P Jones a look!


"Tim Wescott" wrote in message
...
Check out Marlin P Jones (www.mpja.com). They have a number of surplus
switching supplies -- they should have some 12V supplies that really _are_
12, and are isolated so you can rope them up in series. I do not know if
they have supplies that can go to 35 amps, but as you said in another post
you can supply each motor seperately. I usually browse their site, then
check out the supply manufacturer to see if the supply is still listed.

They _won't_ be as cheap as PC power supplies, but they _will_ give you a
much greater chance of success, and the are cheaper than the same supplies
new.

--------------------------------------
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com


"Charlie" wrote in message
...
Since I have these power supplies laying around, I can't resist asking.
:)

A friend is going to buy and/or build a robotic CNC setup for his plama
torch.
A system is $5000 complete or a mainboard and software can be purchased
for
$1500
or so with him supplying the motors, power supply, etc.

He says he needs 35 volt power supply with 35 amps.

So if I wire together 12 power supplys (12v, 9a), voila, 36 volts at 36
amps.

Hehe, it can't be that easy can it?

On Sun, 1 Feb 2004 11:30:10 -0600, "Charlie"
wrote:

Since I have these power supplies laying around, I can't resist asking. :)

Screw the CNC stuff..gut the old towers, put a piano hinge on the side
cover...insulate 'em ( keep the PSU), add a peltier
{http://www.vibecomputers.com/index.cfm?loc=hardware&if=y&mcat=45&scat=00}
( power it with the old PSU& appropriate fans/heat sinks) and make a
"computer beer cooler"!
Make sure the front LEDs still work..so it looks like a real computer
when the boss walks around! ;-)