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Old 21st November 2005, 05:46 AM   #11
sangram is offline sangram  India
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You could probably use linear regulators since you have a 12V input.

Remember that in PC systems that old, the CPU etc. drew power from 3.3 V rails. So you have to have a very robust regulator/series pass on that rail, at least 15 amps current draw.

Check out www.mp3car.com they have links to some nice 90 watt SMPS supplies for car PC. May suit yyour requirement, some of them are so small they'll plug into the ATX connector directly!!
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Old 21st November 2005, 06:25 AM   #12
tom_73 is offline tom_73  Germany
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hi,

there are great differences in that converters output sine wave, look into eBay descriptions (for example) and dont buy the cheapest, better the most expensive .
Be sure that you get much overhead, for example your PC (in this case) take about 70-80 watts input, get an inverter with 600 watts.
Also try a very good Power Supply like heavy-weight/great quality Fortron Source (FSP).

As you dont need so big PSU you can also look for FSP 145 (i.E. 145-50 NI on eBay), these are Mini or Micro ATX PSUs with short cables and different mounting, but save space. I drove an Athlon Barton 2400 XP + GF2 GTS + 4 Harddrives + more (full load 170 Watts) with this without any Problems (but gets warm) on a PSU-test setup.
http://img516.imageshack.us/my.php?image=fsp12yn.jpg

To save more energy you can change the ATI to a 2D-only Matrox PCI Card, i.E. "Matrox Millenium" if you dont need 3D.

have fun,
tom
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Old 21st November 2005, 07:21 AM   #13
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Here's a linear setup I tossed together for an AT style motherboard.
For ATX you'd need to add the 3.3V regulator,and a constant +5V For "standby".

http://www.users.qwest.net/~ptaylor/...er_supply.html
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Old 22nd November 2005, 03:08 AM   #14
AJT is offline AJT  Philippines
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there was a thread here about a pc psu being converted to run on 12volt car batteries, but now i can not find it! wonder where is could have been.
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Old 22nd November 2005, 07:09 PM   #15
MaXiZ is offline MaXiZ  Italy
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Quote:
Originally posted by mflorin
In my opinion, inverter doesn't like the input capacitors of the pc power supply. I think that at the first moment, they look like a short circuit for the inverter's output and probably a current protection acts.

Connect a resistor between the inverter's output and pc power supply and try again. If it works you can bypass then the resistor with a relay or a triac.

Regards,
Florin
Of which value should be the resistor? Thanx
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Old 22nd November 2005, 07:18 PM   #16
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What happens if you plug in both the lamp AND the computer PS (use a power outlet strip if the inverter has only one outlet)?

Does the lamp go off when you try to switch the computer on?

Does it dim significantly?

If the computer comes on while the lamp is plugged in, will it remain on if the lamp is unplugged?
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Old 22nd November 2005, 11:18 PM   #17
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Maxiz, some pc power supplies needs a load to work properly (because they are regulated and regulation at light loads is sometimes difficult), maybe that's your problem, you can load for example a 5-10ohm resistor to the 5 volts output and see what happens.


Cheers
Juan Carlos
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Old 28th November 2005, 08:38 AM   #18
MaXiZ is offline MaXiZ  Italy
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What's the easyest way to obtain +3,3v?
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Old 1st December 2005, 12:11 AM   #19
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http://www.mp3car.com/store/index.ph...c9caf41cc624e2

lot of dc/dc atx mini xtx power supplys
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Old 17th December 2005, 11:54 AM   #20
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Default design a power switch with UC3842

I would like to design a power switch with UC3842,
220vac input , 150W,
flyback structure,
multi output of +/-5v, +/-12V,15V,all are 3A.
from the datasheet of UC3842,
there are some reference circuit,
but if I want to design a novel circuit so as to get better performance.
what should i do ,a novel voltage sample circuit or other new idear about this design.
anyone who are familiar with UC3842,please give me some suggestion,
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