FIRST POST!! wowz. ;

Posted at 9:53 am on Sep 9th, 2005 by dan

Why can’t an inverter chip like a 7404 be used to invert the sound waves picked up by the microphones? When the two sound waves were combined they would cancel each-other and remove the unwanted sound.

Posted at 11:42 am on Sep 9th, 2005 by jcl236

Wow. A truly useful hack. Thank you Hack-a-day. This is what i need for my electronics course and will be great for killing the jetengines on my computer (AKA 6*80mm fans that were my brothers adding)

The only recommendation that i would have would be to combine the two projects and USE Cat5 wiring. Its perfect. 4 twisted pairs in one cable.

With the right combonation you could end up with some headphones I can now hear that idiot sneek up behind me in battlefiled vietnam.

Posted at 1:03 pm on Sep 9th, 2005 by Hal Hockersmtih

Yeah…I shouldn’t have any problems walking onto an airplane with one of those strapped to my belt. ;)

Posted at 1:18 pm on Sep 9th, 2005 by hwyman

jcl236:
The 7404 is digital instead of analog.

Posted at 2:15 pm on Sep 9th, 2005 by craash420

i made my speakers into ones that use cat 5 patch cables for added length, a week ago. this is a nice project but doesnt it seem to drift into making a listening device, lol.

Posted at 12:59 am on Sep 10th, 2005 by mikeroq

Excellent, that’s what I’ve been looking for for ages!

Posted at 5:51 am on Sep 10th, 2005 by t3h

is there a software version of the circuit so I can use my computer to generate the cancelling noise?

Posted at 9:42 am on Sep 10th, 2005 by george

I’ve built these headphones using the Ryckebush circuit before. (about 4 years ago…) They worked great initially, but the battery life was horrendous, the box was ugly and HUGE (not fun in airports, I never tried to use the headphones on an airplane again after 9/11 happened, since I wanted to actually be able to get through security.), and after 2 airplane flights it stopped working reliably.

It cost me over $40-50 for the parts IN ADDITION to a pair of headphones themselves and went through $3-4 of batteries every 2-3 hours.

When I first built them, ANC headphones available on the market were all extremely expensive, and the homemade ones were cheaper. This is no longer true.

It’s a far better idea to buy a pair of Philips HN100s or HN110s off of eBay – I bought mine for $15 *including* shipping, and they blow away my homemade ones in every regard. Battery life off of a single AAA (instead of a pair of 9vs) is insanely long, the cancellation is better, and the unit is far more compact.

Posted at 12:21 pm on Sep 21st, 2005 by andy

Hi, was wondering if anybody here could help me modify my current Skullcandy Skullcrusher to add some noise cancellation technology.

I love em for the bass, but I can hear everything. I have some old Sony MDR NC 20 I don’t like and wouldn’t mind dismantling.

My skullcrushers have a compartement for 1AA battery already for the subwoofer technology.

Could anybody help me with figuring out how to hack my current skullcrushers with the noise cancellation technology from my sony’s to make the ultimate pair of headphones?

thanks for the help!!

write me back with a relevant email title (so I know it’s not junk mail)
cool_jessica@hotmail.com

Posted at 12:02 pm on Oct 29th, 2007 by Jessica

Incredible… what an idea! A DIY pair of noise canceling headphones! To be honest i’d stick with a pre-built pair of noise cancelling headphones from sennheiser or Audio echnica.

It seems like a LOT of hassle to build them yourself! :)

Posted at 6:31 pm on Dec 10th, 2007 by Erik

Incredible… what an idea! A DIY pair of noise canceling headphones!

To be honest I’d go with a pre-built pair of noise cancelling headphones from Sennheiser (http://www.hifiheadphones.co.uk/sennheiser-man-17.html) or Audio Technica (http://www.hifiheadphones.co.uk/audio-technica-man-18.html)

It seems like a LOT of hassle to build them yourself! :)

Posted at 6:59 pm on Dec 10th, 2007 by HiFi Headphones

I’m looking for cancellation of industrial noise coming from outside the house. I envision a microphone outside picking up the source noise, connected to a pc in the house running software to cancel the noise. The inverse noise would be broadcast by speakers in the room — so I could sleep without earplugs or headphones. The source noise is from compressors or diesel engines and is very constant/unchanging. Any ideas? The scenario seems identical to noise cancelling headphones: The mic is external, the cancelling noise is produced in an area isolated from the source. (My room is equivalent to the inside of the earphones.) I would think this could be a useful and popular application.

Posted at 7:42 am on Apr 9th, 2008 by william m

William – did you get anywhere with this? I could do with a set up EXACTLY the same as you’re after – any hints?

Posted at 8:28 am on Oct 24th, 2008 by andy

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Posted at 1:01 am on Dec 22nd, 2008 by Ruhande Mohammad