Server converted power supplys.

Post by **kr0ne** » 14 Aug 2015, 08:59

You could try diodes for dropping the fan voltage... less heat!

Post by **sureshot** » 14 Aug 2015, 19:01

Yes i could have dropped the 3 volts with a few series diodes, but the fan is only about 120 mA total and with the single series resistor it runs cool to the touch. It was a 4 lead fan so pwm, but its fine running fixed speed on the 2 wires needed to spin it up, its about the same speed as if the pc was in use, fairly quiet. I could of stuck another 2 lead 92mm fan in it, but its got to stay a bargain to covert.

Post by **sec1223** » 15 Aug 2015, 12:13

Mine turned up today.

Post by **sec1223** » 15 Aug 2015, 13:43

stripped down

Post by **sec1223** » 15 Aug 2015, 13:44

ok... im going to de solder the output pins but i want to replace them with some kind of psu type terminals.

any ideas of what i could use?

Post by **cjay** » 15 Aug 2015, 20:54

Depends, I'd try to solder a bus bar onto it.

Post by **sec1223** » 15 Aug 2015, 21:19

thats what i thought cjay.... iv mannaged to get all the pos and neg terminals off so iv got a clear view of the board bottom ant top..

il take a pic tomorra

Post by **sec1223** » 15 Aug 2015, 21:35

like this...

Post by **cjay** » 15 Aug 2015, 22:04

Nice.

If I could guarantee there are no tracks inside the board around those points, I'd think about exposing the copper on the board, drilling through the board and soldering a few machine screws to it, then you could bolt the bus bar to it, use a few shakeproof serrated washers.

Post by **Mattylad** » 15 Aug 2015, 23:00

You could scrape all the solder resist (green stuff) off so that you can solder bigger terminals onto it, a xacto type knife will do, or burnish it with a dremel - just be careful not to scrape the copper.

Even if it as a multi layer board I cannot for the life in me see anyone putting any tracks between the power pins on an other layer as there would be no need so I would be tempted to drill bigger holes - you can always inspect them with a magnifying glass afterwards to see if anything had been boogered up.

Post by **cjay** » 16 Aug 2015, 07:02

Neither can I, the only thing I can think is that there may be a sense connection but I agree that's unlikely

Post by **sec1223** » 16 Aug 2015, 09:48

any suggestions as to what i can fit onto it?

Post by **cjay** » 16 Aug 2015, 10:36

What will the maximum current per device you'll be drawing from it?

I'd go with the bus bar and tap that to accept machine screws for fixing crimp eyelet/ring terminals as well as a few heavy duty binding posts.

Post by **sec1223** » 16 Aug 2015, 11:59

TBH, no more that 25-30 amps in total lol

any links to the bus bar your referring to cjay?

Post by **Mattylad** » 16 Aug 2015, 12:51

Assuming that those pins are 0.1"/2.54mm then you could go with something like: http://www.toby.co.uk/content/catalogue ... ies=PCB-10 (this one is the wrong pitch, but Toby do samples).

I can't find a busbar with 2.54mm pitch that's solid bar, perhaps cjay knows of some.

You could go with spade terminals http://www.toby.co.uk/content/catalogue ... ategory=26 to get to big power connectors.
Or binding posts if you can find some big enough for the current.
http://www.digikey.co.uk/product-detail ... ND/5028401 are 36A

Server converted power supplys.

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