Thread: engine wine know how its there but can't get rid of

Also I forgot to add that I tried not using the inverter just plugged the computer into the house power and the "wine" is still there.
Michael

Originally Posted by greenman100

plastic case

Hi, yes the inverter is a plastic case (the only one i could find that would survive crank)
The pc is a metal case.
Thanks
Michael

With all those components running, no matter what you do, your going to get different grounding resistances.

Best thing to do is ground as much as them as you can to one grounding block. For example, under my rear seat, I have a grounding block that takes like 4 inputs and goes to one 4 gauge wire to a big bolt that connects to my frame. I ground my PC PS to that, the Amps, and my Cap to that.

Also running a USB soundcard will help get rid of any noise that is created before the soundcard on the PC side.

Goodluck, sometimes it takes alot to get it to stop, but it's possible.

This is a great post - http://forum.sounddomain.com/ubb/ult...c;f=5;t=008251

its the inverter, ditch it and get an OPUS, problem solved.

maybe I could input my 2c.

the inverter you are using creates a 'modified sine wave' which unlike the electricity you get at home isnt a PURE sine wave, but is made up of a voltage being incrementally stepped up and down to make it look similar to a sinewave.

unlike a pure sinewave, a modified sine wave contains Harmonics. In plain terms, the signal you get from the inverter is composed of more than just the 60hz 120v signal you are looking for. its these additional harmonics that cause the interference.

you could seperate all the wires you want, but your computer is already being driven by this dirty power, and as they say 'garbage in = garbage out'

I only feel the external usb sound card might be able to help, unless you need to plug that into the inverter as well. give it a shot and see what happens. (post your results here)

your best bet would be to go for an opus or a PURE sine wave inverter.

a pure sinewave inverter would definitely set you back atleast a few hundred bucks though ...

I currently have exactly the same symptoms you just mentioned. i.e no buzz when power cable unplugged etc. I just dont have enough money to fix it...

Originally Posted by kirbycope

its the inverter, ditch it and get an OPUS, problem solved.

Originally Posted by anik321

you could seperate all the wires you want, but your computer is already being driven by this dirty power, and as they say 'garbage in = garbage out'

Originally Posted by michaelrj9

Also I forgot to add that I tried not using the inverter just plugged the computer into the house power and the "wine" is still there.
Michael

please read the man's posts.

thanx greenman. my apologies.

anyways, are you sure there no engine whine when you DONT ground the computer parts ? maybe the buzz is too overwhelming to hear the whine ?

if that is the case, why not remove that ground and then get a good inverter ?

do try other cheap solutions first.

giving a good ground is a big part of the battle, but you also need to eliminate the engine (alternator and/or ignition) noise from the supply voltage as well.

some of this may not help, since you said it still whines on house power... but it couldn't hurt to try.

radio shack sells an interference blocking kit... it consists of a large inductor, and a capacitor. since you are using an inverter instead of a DC-DC, the inductor may not help much (you'd want to put it on the 12v input to the inverter... however, it may not have a high enough current rating for your inverter)

but they give you instructions for installing the capacitor on your ignition coil, which is supposed to reduce ignition noise (if that is indeed what's causing the whine, rather than alternator noise)

if you really want to get fancy, you could cut the 5v wire in the USB line going to the USB sound card (or buy a couple connectors and make a little plug-in inline device) and add an LC filter (inductor in series, cap to ground) to remove high-frequency noise from the power source of the sound card, and also run a wire from the ground wire of the USB cable to a solid chassis ground as close as possible, to give the sound card itself the best possible ground reference and power source. the inability of the sound card to block interference on its power input seems like the only real difference that would cause it to experience whine, while the head unit does not.

here's a thought, if you have a laptop (or can borrow one), try running the USB sound card from that instead. if it whines, you'll know it's a problem with the sound card and/or the wiring from there to the amp/head unit/however you have it wired up. and if it doesn't whine, you know it's got to be something with the computer and/or PSU, since you already showed it whines without the inverter... trying to narrow it down further sounds like a good bet at this point.

Originally Posted by anik321

thanx greenman. my apologies.

anyways, are you sure there no engine whine when you DONT ground the computer parts ? maybe the buzz is too overwhelming to hear the whine ?

Hi, you might be correct that the "buzz" is too overwelming to hear the wine but as much as I try to listen, I do not hear anything else except the "buzz". Correct me if I am wrong but I would think I would still hear a little bit of the "wine".The buzz is very anoying but not to where I would not be able to hear the "wine" I don't think.Then you would think if the wine is there under the "buzz" noise it would change the noise of the "buzz" a little if I rev the engine and it does not change at all.
Thanks
Michael