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All electronics are susceptible to electrical noise. Some more than others. Where does this noise come from? Nearby electronics, cables/wires acting as antennas for noisy equipment, atmospheric disturbances (thank you mother nature), the power utility and even switching on and off lights in the home.

What will electrical noise do? It can make sensitive equipment produce erroneous results, static in audio outputs, decrease your wifi signal strength and also increase electronic equipment power consumption.

Read on for a very easy, non invasive way to reduce electrical noise.

Step 1: The Ferrite Core!

Ferrite is a wonderful material to trap electromagnetic energy in the form of heat.

Snap on ferrite cores are readily available and very low cost. They come in a range of sizes and making as many loops possible in a ferrite core will give higher attenuation of electrical noise.

Step 2: Examples of My Application.

I put ferrite cores on as many cables as possible. USB, cat5e, DC power, AC power, even right below my WiFi antenna. Remember, even the shield on a coax cable will leak electrical noise into your equipment.

Simply put, a system with cables going in and out should have ferrite cores. Every little bit helps.

In my case I reduced erroneous reading from my labjack u3 which is part of my home automation system. Also the signal strength of my DIY WiFi antenna mod has become much stronger. All in all, those low cost ferrite cores have paid off. Give them a try!
<p>Tried that in my cars back camera(I've put that myself) but doesn't really work</p><p>To be honest I'm searching everywhere and no one has ever solved my <br>problem, I do get noise to my android head-radio unit(replaced my <br>factory one) but not that much, if I touch the brakes? well I hear a <br>tiny buzz(as long as I hold the brakes-and the android unit is powered on) from the speakers and the rear camera signal is lost.</p><p>The last solution I could think of is to put a relay-switch and use an extra battery in the trunk so when I put reverse gear it would get a signal from the reverse light and get power from the extra battery(no noise at all)</p><p>If you just wondering what brand is my car, it's a Seat Ibiza 1.2 SC TDI E-ecomotive(2012/03)</p><p>P.S.<br> The electrical noise is also a problem for a mini sub I've tried to put<br> under the passengers seat(drawing power from the cigarette lighter) <br>...you can hear the rpm's of the engine from the subwoofer(which is rather annoying)</p>
<p>Dude just change your alternator!</p>
<p>Thanks.<br>This is too easy (and cheap) not to try.</p>
It worked for my home automation system!
<p>Thankz</p>
<p>Thanks for the advice, I'll try that</p>

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Bio: As of April 2017 I have decided to no longer post on instructables. The fact that several of my published works have been removed without ... More »
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