Tested my high current psu couple of days ago... 2 explosed devices (small capacitor, fuse) and one small fire (another small cap), it works... :)
Only problem is damn thing weighs a ton, I have a 300W torroidal transformer (for dual 120Ws which I'm not longer getting, *sigh*) and it's about 6 pounds, too heavy.
Think I'll be getting a 220W TEC and a prebuilt switching supply, should be able to get one weighing around 1 pound for 25A.

which transformer should I get, 12.6V 25Amp(17.7V) or 13.5V 20 Amp(19.1V)?

each needs to power 2 172Watt pelts.

butcher, you talking about that meanwell s350? its like $100 + shipping.

[ 12-16-2001: Message edited by: resago ]

yeah they aren't cheap but big transformers weigh too much :p

As for the transformers, I think your volts are off... I make the 13.5V able to provide 16.9V ((13.5-1.4)*1.4 = 16.94) which would put you using about 20A with two 172W tecs. That's pretty close to the line. Also unregulated power supplies tend to suffer from voltage drop as load picks up so that 13.5V may only be able to provide around 15V with a heavy load on it.

and the 12.6V would drop to even less.

so should I go with the 13.5V or 12.6V transformer?

which would provide more cooling without blowing up?

Does anyone have the voltage/current graph for the drift-.08?

[ 12-17-2001: Message edited by: resago ]

I took the following text from another site:

220Watt Peltier
http://www.tekheads.co.uk/products.p...oductId=600604


With no sign of over-heating in connections,took some rough Volt/Amp readings under the above conditions :- 5v/7a, 6v/8a, 8v/11a, 10v/14.5a, 12v/17a, 13.8v/19.5a, 15v/21a, 16v/22a...
These observations may interest those choosing a suitable PSU for this Peltier.

I'd say go with either. On the one hand the 13.5V will give more power to the TEc so you'll likely get better temps. On the other hand the 12.6V is less likely to melt ;)

My current TEC supply is a 3-15V, 25A bench supply. It's a very nice unit but weighs 9Kg (about 20 pounds)!

If I could get the 220watt pelt in the US, I'd get those and go with the 12.6V 25amp TXfmr, I guess if I have to get 172watters, I'll get the 13.5V model.

I really wish someone in the states would carry those 220s. argh!

Here's the link to the 13.5V 20Amp Trxfrmr is anyone is interested.

http://www.mpja.com/product.asp?product=12788+TR

this is the site where you can also get the 50Amp rectifiers and delta 120mm fans.

Also this PS would just barely power the 220watt pelt at 12v
http://www.mpja.com/product.asp?product=12611+PS

[ 12-19-2001: Message edited by: resago ]

would any of these be an exceptable choke?
http://www.mpja.com/list.asp?dept=157
could someone explain the ratings and what specs I should be looking for?

[ 12-19-2001: Message edited by: resago ]

http://www.mpja.com/product.asp?product=12464+PS

5v @ 30a, if you get 4 of them you have 20v at 30a.

as well as of course the 4x 12v @ 8a and 4x -12v @ 4a

mounted caps(4 55,000uF 20V) and rectifiers(50Amp 400piv) to top of case, when I have a few more dollars, I'll get the transformers. Is there anyone that has a couple 220watt pelts you could send me?

I'd much rather get 2 12.6v 25AMP Trms than 2 13.5v 20AMP. but I NEED 220watt Pelts!!!


http://kornnutz.virtualave.net/supercool/power1.jpg

http://kornnutz.virtualave.net/supercool/power2.jpg

http://kornnutz.virtualave.net/supercool/power3.jpg

[ 12-22-2001: Message edited by: resago ]

The asus dually looks nice, but it looks like I'll need some of those golden socket thingys to overclock. Anyone know where I can get a couple?

I'm wondering what you're doing with that little waverunner :D

The toroidal look good, but there is no current rating. 0.1 Ohm resistance is too high for your current draw.
Just put four 5µH 10Amps.
I would try two capacitors at the input of the chokes, and the 2 others at the output.
You may try different combinations and see what work best.

Check out this page, thats the brand of the power supply I'm using, they sell a lot more powerful power supplies. http://www.power-one.com/products/acdcintro.html
You can even pick the parts you want for a custom power supply.
I have the 1500 watt model that is 24V 64A

yes, but how much would a new one cost?

Have you guys seen these?
http://www.ioport.com/peltiers.html

I don't know much in the electronics department. Would these be sufficient?

156w 48mm pelts aren't too popular, cause a 172w 40mm concentrates the 'cold' much more. For those in the extreme crowd, 172w 40mm or 220w 48mm pelts are the only options

more pics
 

Got 1 of 2 transformers. I'm getting 17.5V no load.
http://kornnutz.virtualave.net/supercool/power4.jpg
http://kornnutz.virtualave.net/supercool/power5.jpg
http://kornnutz.virtualave.net/supercool/power6.jpg
http://kornnutz.virtualave.net/supercool/power7.jpg
http://kornnutz.virtualave.net/supercool/power8.jpg
http://kornnutz.virtualave.net/supercool/power9.jpg

no fires or explosions either!:evilaugh:

Damnit that thing is huge :D
You should get a digital multimeter too :P
17.5V no load, you should be able to pull 15V loaded +/- 1V

are you sure that green thing isn't an explosion? :P

btw, I presume thats the 13.5v 20a one?

yup, its the 13.5V model. At first I wired up the primary and secondary backward and MELTED my first outlet plug:D

after reversing wires, everything is sweet.

the green thing is a 12V LED, at 17 volts it starts to cook the green film off:evilaugh: but I needed something to drain the capacitors after I shut the thing off.

gonna order the second transformer soon, it will mount up right beside the first one.

BTW this stuff is fun.

You should use a real led not those pansy 12V things ;)
And don't you use fuses? I have never melted an outlet plug ever, you need a fuse to stop that sort of thing ;)

Just curious, what happens if your sitting next to it and one of those caps blow. I'm no expert but I've seen cap blow and those look like they could blind someone.

Duck and cover :D
Basically you get showered with flying bits of burning hot metal and electrolyte, it's not fun :p
Luckily caps rarely explode unless you connect them backwards or put far too much voltage through them.

Bwah hah hah.

I might consider a metal box to put over the caps.

I'm looking into some fuses too :D

I'm going to put the ps_ok line on 2 relays and 2 temp switches, if anything fails, the computer shuts down.

I'm thinking of also using a momentary switch to power a relay to the pelt power supply, after its on, the pelt PS will power the relay and keep it on, if a cap blows, etc.., it shuts itself down.

now where did I put all those relays??:shrug: I'm sure my car has some that it doesn't really need:evilaugh:

where are you going to put the temp switches, under the core, or on the side of the coldplate?

hmm, I had considered just on the waterblock, I hadn't though about a pelt failure, I was thinking pump failure. the relays would protect against pelt PS failure.

would what the relation of temp be between block and cold plate if a pelt failed. though it will be protected somewhat since each block will be running 2 pelts.

Must think some more.

the dual pelts should provide enough protection if one should fail, I would notice the problem by the fact that the CPU is no longer running below 0C. Not catastrophic by any means :D

anyone have any thoughts?

just put it one on either side of the coldplate. So if one pelt fails, you'll still see it