12V-100AMP Supply for $20.00!!

[Brake Weight]

What about this guy?
http://m.bestbuy.com/m/e/product/detail.jsp?skuId=8311052&pid=1174091945952

If you're not on a mobile, go to Best Buy and search: 8311052

 

[Robb]

What about this guy?
Dynex™ - 400-Watt ATX CPU Power Supply - DX-400WPS - Best Buy

If you're not on a mobile, go to Best Buy and search: 8311052

Well; you could get a supply from BB and spend $40 & shipping. At 12.3v, it will deliver about 30 amps. Guys have used that kind of a PS too.

But compared to the server supply, it really doesn't compare. The server PS as mentioned by the original post is 1/2 the cost and has more than twice the amount of amperage available. The server supply I purchased was only $20 - and that included the shipping as well. 75 amps for $20 is a bargain in anybody's book - IMO . . .

 

[Brake Weight]

My local BB carries them, so no shipping. None of the computer shops near me have a server supply. Ordering electronics from fleaBay is hit or miss, but $20 ain't much and this BB PS is guaranteed to work 98% of the time, every time.

I concur this isn't as good a deal, but an option for some.

 

[KD2GOE]

wow I am going to do this this needs to be a sticky or some thing!

 

[Radioman1]

HP 20. Dollar supplies

Did anyone ever come up with a fix for the noisy and I do mean noisy fans

THANKS

 

[dragracer]

There are some articles showing how to put resistors inline with the fan power wires. It says what size of resistors to use to have the fans run at half speed. Should be easy to find...

 

[unit_399]

When the supply is used in a mainframe, it runs continuously at full output and needs a lot of cooling. Intermittent use (like powering a radio or linear) requires much less cooling. I removed the original fan assembly, and installed a slower (quieter) one. The supply has a circuit to detect whether the fan is running, so I built a 555 oscillator @ 360 hz and connected it an shown.
Using resistors to slow the fans works, but the resistors generate a LOT of heat which requires more cooling. :headbang

 

[dragracer]

So you are just using 3 terminals of the 555? 1 gnd, 8 vcc, and 3 output? No other parts involved?

 

[unit_399]

The 555 is setup as an astable oscillator. about 7 parts total as I recall.

 

[dragracer]

OK thanks....

 

[vo1ks]

How have you connected the power supply DC output to the real world?
I've tried 1/4 inch spade terminals but they don't seem to hold very well.

 

[vo1ks]

Here's what I'm trying to reduce the fan noise.

Snip the red wire from one fan and the black from the other. Place a 39 ohm 1W resistor between the lines going to the fans and heat shrink the other ends. Do not connect these wires together! They are just covered with the same piece of heat shrink.

Instead of 12V to each fan, they operate at less than half voltage, about 140mA current through each in series. The resistor is in the air flow from one of the fans to ensure it remains well cooled.

There is considerably less noise compared to the original screaming fans!

 

[MrExtreme]

Does anyone have a link to the mods for the Dell PowerEdge power supply? I just got one off ebay for $16 shipped, been searching all afternoon but no luck yet.

Thanks Lee

 

[maui101]

Look under homebrew section. Got 100 amp P/S for $20. May have Dell info there . 73s.

 

[Flatlander]

do you have diagrams & pics of build?