CurtPalme.com Home Theater Forum

[PaulB]

Hi,
I've managed to totally forget which pin is which on the LVPS fan headers . I need to know which pin is the power + on which header.

Normally it doesn't matter when connecting fans but as I'm about to drop in a 24v to 12v convertor for my new Enobal Marathon fans ( thanks Nash) I think I need to be pretty damn sure which is power and which is ground.

Picture below is taken from the fan side, J8 on the left, J7 on the right.

My apologies for being thick and my thanks for any help!




Taken with crappy camera, still not replaced PC now cocking up as well, BSOD every 20 minutes or so, hardware fault, looses ALL my passwords every fragging time!!!

[Nashou66]

Paul if your using the original clips form the original fans they only go one way IIRC. but just put the multimeter to them with the Power on and see which one os the hot lead. what i did was run wires of different colors out of the POwer supply that were connected to each pin and measure that way to determine the polarity. I also only used one set of pins for both fans, the new 12 volt power supply was enough to power both new fans.

Athanasios

[Tim in Phoenix]

Hello

On J8, hot at top, J7 hot at bottom of picture. The more important question is, how will your rig react to 12 volts in ready mode?


.

[Nashou66]

[PaulB]

Thanks guys

I lost the clips - don't ask, well, actually I was trying something that worked, took the clips off to shorten the wiring and then lost the bloody things that I had carefully marked so I knew which plug they went into grrrrrr! Got some motherboard type 2-pin plugs that I can use (may change the actual headers themselves to be sure they lock onto the new plugs) but in the meantime I'd forgotten which pin was the power and which wasn't.

I had tried using both fans into one header, worked fine. What about the belly fans, again all three (four) ok to run from one step-down convertor? I think you had thought about using 4 convertors and have them at different speeds but seems overkill (although I understand about noise frequency/speed relationship of each fan).


Using these http://tinyurl.com/yh4qdcb
PDF of StepDown http://www.sureelectronics.net/Temp/PT-PC031_Ver1.0_EN.pdf

[Nashou66]

Paul I don't think those Enermax fans have enough H2o/mm pressure for the belly's unless you go with the 4 fan method that was posted over on AVS somewhere a few years ago. But those did not use any step down transformer or resistors since the way they were wired created the proper resistance
for all four fans. However they were Nocturas I think, so different fans different resistance. Id go with the method tim mentioned somewhere, just leave the original belly fans isolate them and add a resistor to slow them down a bit.

One think I have always wanted to try was to have the fans run at different speeds so no one frequency is multiplied by 3.

Athanasios

[PaulB]

I've misled you, I have the Enobals for the LVPS and the ThermalTakes for the Belly.

Talking of fans, did you catch this that I posted in another thread http://www.bit-tech.net/hardware/cooling/2009/09/28/what-s-the-best-case-fan/1 ? Some good interesting stuff there.

[Nashou66]

ok, i would use only three in the belly and lower the voltage more than 12 volts, I thing those when i tested in the tray while out of the Pj were ok but once i put them in they were actually louder pitch wise(higher pitch than originals but lower DB in effect louder overall ), i know I mentioned that somewhere and I also stated i wanted to try the different speeds with them . I did not try it yet maybe you could do that for us Paul, add a resistor in series to two of the fans, maybe a 22 ohm to one and a 33 ohm to the other so all three are different speeds, But first id try it with the enire tray out of the PJ and use the LVPS 24 volt pin to test the tray fan as its the easiest way out of the PJ. do this also keep the originals in and listen to them, then put in the new fans with all the same power factor(12 v), you'll see what I mean about the pitch, these are faster spinning fans, that is why i think they need to be slowed down to quite them further.

Athanasios

[Sparky015]

Paul, just curious, but any reason you didn't go with the PAPST being in the UK? They are readily available from Farnell.com. Just wondering what your decision process was.

Thanks!

Paul

[PaulB]

[dturco]

Paul, do you ever watch movies, or do you just tweak like Nashou?

All kidding aside I am going to see Mike Parker tomorrow to do the LVPS and HVPS. And to fix the Moome card I got which isn't exactly what I was told it was...

I wish I could solder.

[Nashou66]