12 volt regulator

**Kd7jmy** · 10-12-2005, 07:55 PM

OK i have the Snapon 200 watt powersupply for the EPIA motherboard. I need a 12 volt regulator that can handle at least 7 amps of draw so i dont light something on fire. Can some one please post a circuit or an inexpencive product to help me. Im very anoyed with this. I figured that i could just plug it in and have it work. But that is not what happens. So im looking for a 12 volt like 8 amp power regulator circuit or product. Thanks much Tyler

**Bugbyte** · 10-12-2005, 09:21 PM

Carnetix 1290 will handle 90 watts and should work. The 1260 will handle 60 watts and is cheaper. Or return the 200 watt power supply and purchase an Opus.

When you say "it doesn't work" do you mean that it isn't regulated, or the computer actually doesn't work when you hook it up to the DC power supply?

**pRoFiT** · 10-12-2005, 09:22 PM

hahaha, welcome to the crowd!

You should of researched online before buying something. I built a 14 amp regulator cost me about 40 bucks in parts. Might of been able to build it for less but i didn't ebay anything. And I still need more current from it.

If you

on here you should find the mod for that power supply so you only have to regulate the 12volt circuit.

I used this
http://www.mitedu.freeserve.co.uk/Ci...er/1230psu.htm
Then I modified it for 12volt in and 20 amps out and ran short one TIP2955 so it only came out to about 15 amps.

Hope this helps. Should of bought the opus power supply! Or some of the higher end ones currently being designed through this websites users.

**Kd7jmy** · 10-15-2005, 04:43 PM

It works only if i have my voltage input to 13. somthing. How can i return it. just email minibox

**Bugbyte** · 10-15-2005, 08:59 PM

This is usually caused by using a cheap regulator like an ITPS but you said the power supply isn't regulated. Other causes are lengthy power cable runs with too thin a wire causing voltage to drop too low to run the PC except when the alternator is putting out 13.5 volts or thereabouts.

You should check the voltage at the battery and the voltage at the inputs to the power supply to make sure it isn't dropping off too much. If it is, you may need to recable it with lower gauge wire. If you only need 90 watts then 8 gauge will work. That's what I ran for mine.

In any case, returning the power supply and purchasing either an Opus or an M1-ATX will fix the problem. Or if they won't take it back, add the Carnetix 1260 as the regulator.

**Kd7jmy** · 10-17-2005, 12:11 AM

I have 8 gauge wire to it. so that is not the problem its that the voltage in it too High. and i dont know of a resistor that will take that ammount of watts.