DC-AC Inverter

**badinstincts** · 01-17-2007, 04:28 AM

Ok, I got my 15" dell ultrasharp screen above the passanger seat glove compartment, a dell 4600c computer in the trunk, and the best buy 750W continuous power supply in the trunk. I finally got the sound hooked up today and tested everything out. The monitor is making a weird humming noise and so is the audio from the computer at high volume.

I figured I have to get a ground loop filter for the audio, but do I ground the power from the computer monitor? Can you ground a 120V device onto the car chassis?

I took the monitor home and tested it and it doesn't make noise at home... So it would be nice to have this fixed, the audio too.

Thanks

**psyrex** · 01-17-2007, 12:10 PM

no, do NOT "ground" as 120v device (powered from an inverter) to a car chassis. That is very very bad.

Humming is likely a power issue. Try a different inverter.

**liquid_smoke** · 01-17-2007, 12:22 PM

i thought humming was good

sorry i couldn't resist.

**badinstincts** · 01-18-2007, 02:56 PM

What are the good brand names? Which are the best? I'm using a vector from best buy and it makes my monitor and speakers buzzz.

**RedGTiVR6** · 01-18-2007, 03:12 PM

is there a reason you are using an inverter?

are you opposed to using a DC-DC power supply?

**Bizarro** · 01-18-2007, 06:04 PM

Inverter FAQ

**badinstincts** · 01-19-2007, 04:23 PM

well, i'm using a dell 15" ultrasharp and its humming with a regular inverter. so i need a better one. my carpc is a dell dimension 4600c... The audio buzzes at high volume. I connected my laptop to the inverter and the audio buzzes at high volume, off the laptop battery the audio is clear.

**badinstincts** · 01-19-2007, 04:36 PM

ok, so I guess I need a Pure Sine Wave inverter. Thank you Bizarro for the FAQ. Now what are the good brand names? I would need about 400-600W...

**badinstincts** · 01-19-2007, 04:50 PM

How do I go about using a DC-DC inverter with my monitor and computer?

**RedGTiVR6** · 01-19-2007, 05:07 PM

how to use a DC-DC PSU you mean?

You're not inverting anything, so it's not called an inverter.

How do you use it?

I think some reading is in order. You need to look at some work logs, some diagrams, and some PSU manuals to understand it.

Basically, the DC-DC PSU would replace your PSU for your PC that you're using now.