I just put together an MP3 player for my car using an EPIA-M10000 motherboard and the PW-70 power supply. I drove from Provo, UT to San Diego, CA and back last weekend and it performed flawlessly. The trip was 9-10 hours each way, plus a few hours of driving around while I was there. It didn't have any problem with the 14+ Volts coming from my car, though it would shut down when starting the car - a tank circuit should take care of that.
My power needs were modest - 1 2.5" hard drive, a USB joystick, and a CrystalFontz 4x20 LCD display.
Installation is simple - just plug it into the motherboard and give it a good ~12V supply. it's compact size and on-motherboard mounting allowed me to build a very small enclosure (carpeted to match my subwoofer).
Matt
P.S. You can get the PW-70 at http://www.mini-box.com/pw-70.htm for $49.95.
Originally posted by utahrc
P.S. You can get the PW-70 at http://www.mini-box.com/pw-70.htm for $49.95.
Yaa, any transients that come from your car into the power supply can damage your motherboards 12 volt systems. If you are usinga Laptop drive, that probably mitigates some of it.
Your fan speed will probably change as you rev your engine... (assuming it idles slow enough..)
MPEGBOX - Plexiglass Computer
www.mpegbox.com
Could someone post a close up picture of the power supply and read the numbers off the chips on it if they are not readable in the pics. I would like to get and idea of how that power supply is made and if it has any regulation on the 12V at all.
________________________________
Via Epia M9000, Opus, and a cool custom case. All in my Saabaru 9-2X Aero.
It doesn'tOriginally posted by Trottingwolf
Could someone post a close up picture of the power supply and read the numbers off the chips on it if they are not readable in the pics. I would like to get and idea of how that power supply is made and if it has any regulation on the 12V at all.
It connects a mosfet from the input to the output when the main rails are suppose to come on.
-Jeff
MPEGBOX - Plexiglass Computer
www.mpegbox.com
yeah thats what i thought but i would also like to know what regulators and mosfets are used
________________________________
Via Epia M9000, Opus, and a cool custom case. All in my Saabaru 9-2X Aero.
The mounting is such that I cannot easily remove the power supply - the hard drive mounting rails go right over the top of it. I can take a picture of the top side but, as I recall, most of the components are on the other side of the circuit board.
Regarding the lack of filtering, risk of transients, etc., I understand that damage is possible, but after seeing so many accounts of people using similar DC-DC supplies in their cars without problems, I figured I'd be willing to take the risk.
I'll post a follow-up if I end up with a fried motherboard or drive.
Matt
why not just spen $5 and build you one of these
2007 Honda Fit Sport 1.5L SOHC-VTEC
'Cause I'm not smart enough to figure it out on my own. :-) Looks like something easy enough to add when I build my tank circuit. Question though: What happens when Vin > 14V? As I recall, my voltage may go as high as 14.4 or so.
Matt
well, you already planned on the voltage to go that high, im assuming that the raised voltage will give a higher output(maybe something like 12.5 volts?) so its still less than the original 14.4
this circuit is said to handle up to 15VDC input, just an expansion on the first circuit i posted.
2007 Honda Fit Sport 1.5L SOHC-VTEC
The problem with those 12V regulators is that they have a votage drop of a little over a volt about 1.5V. When your car is above 13V every thing is fine, but if you turn the engine is off and your battery is at 12V then that regulator puts out about 10.5ish volts. So this means that this may not work when the car is off.
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