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Building a simple Alternator whine / ignition filter
- Thread starter Moleculo
- Start date
Exactly. That's kind of like saying if you don't like the noise the neighbor's party makes in the middle of the night then where earplugs. Sometimes you just have to cure the source of the noise and not just band aid it. Bonding and grounding works in some cases however in most cases it can be a LOT harder to do it properly than to simply install a single capacitor. I had fuel pump noise in a car at one time. Yeah it was a Ford. I bonded the doors. I bonded the hood. I bonded the trunk. Nothing cured the problem. I then pulled the back seat to get at the fuel pump wires and soldered a 0.01 uF capacitor across the leads and the problem went away.I should have spent that half hour days before.
hi everyone. i'm from the philippines, I came across this thread while desperately looking for a solution to cure the alternator whine of my portable lcd tv (chinese made). i use a fm transmitter to hook-up the sound to my car's stock audio system. the lcd tv is producing the annoying alternator whine (thru the cigar lighter socket). i even tried connecting the tv direct to battery but the whine is still there.
moleculo's post solved the problem, only, since i'm a cheapskate and a quick link costs more than 10USD here, so I just used tie wire rolled like a rope as inductor core, and a 4700 uF 25V capacitor (can't find a 35V) and it worked like a charm. that's why I signed up just to say THANKS!
here are the materials i used:
5 meters of tie wire .30$
4700 uF 25V cap .60$
6m gauge 14 wire 3$
project box .30$
electrical tape
super glue
total: less than 5$
Cost of filter.......$5
Cost of running over someone crossing the street because you are watching TV while driving...........priceless
Best answer: If the noise isn't coming in via the antenna (see several earlier posts), build one and see.
The original poster apparently hasn't been to Radio Shucks in quite a while. One 20 foot roll of 14 guage red hookup wire is ten bucks. You can buy a whole 500 foot roll of 14 guage stranded wire from Lowes for a little more than two small rolls from The Shack and build a whole lot more for less. On the other hand, you can't beat their price on project boxes.
Take another look at the original post date. It was made in 2008. You cannot hardly expect prices to stay the same or for posters to constantly update all their posts to reflect changes in prices can you?
Just got this to take Care of electrical noise in my mobile
Just to let everyone know,this didn't work.
I have bought and used some ferrite chokes and a metal film cap and ground strap(exhaust pipe)
Not surprised. It has been my experience that about 95% of noise in a mobile installation comes in from the antenna.
It's an older post and the original pics may no longer be hosted. You'll just see a dead image link instead.