How do I build a noise cancelling box?

I have a small water pump in the basement that creates a lot of noise that can be heard in most of the house. Is there a way to at bulid a 4 side + top box that really works to cancel out at least some of the niose? What materials works best as noise cancelling? Thanks!

Asked by lpm 7 years ago

Cheap Chinese Audio Amp: How can I reduce the noise? Answered

I have a $2.50 audio amp from China.  It's what you'd expect: some rusted components, some scratches on the PCB, and yet it still works.  I use it with a 9v battery, my phone, and a big, repurposed car speaker.  It get's loud enough I think it can easily destroy the speaker with that 9v.   My question: At any volume worth using that amplifier for, there's noticeable noise.  What can I do to remove this?  Some research shows that a capacitor may help, but where would it go?  Thanks

Asked by bobdabiulder 1 year ago

Make some noise with 110v sensor

I have a presence sensor 110v (lights a lamp) and I need make some noise too. I already insert one ac adaptor 12v with a resistor anda a pc speaker and make a irritant noise, anyone have othe idea thanks

Asked by mouserock 8 years ago

Is there a cheap way to reduce noise from workshop ? Answered

Hi all, I was wondering what the cheapest way is to reduce the noise coming from my workshop, which is basically a tin shed. Im using it as a small forge and appreciate that the sound of hammer on anvil is not blockable (think thats a word) but i also use a belt sander, power tools etc, so would like to try and minimise the noise heard outside. Any ideas ?

Asked by Squibo 6 years ago

Thingamakit - Make a Kit Then Make Some Noise

Put together this kit and you'll be making all sorts of noises by turning knobs and playing with light! Looks like a fun kit to put together and at a cost of $55, $65 with an enclosure, it's another good entry point for soldering. Thingamakitvia Make blog

Posted by fungus amungus 9 years ago

cutting sound from noisy neighbor

How to stop noise coming thru adjoining wall from noisy neighbor

Asked by boss44 8 years ago

Phase Cancellation to Prevent Feedback

The Grateful Dead's wall of sound prevented feed back by having two mics for each vocalist with one of the mics 180° out of phase of the other. Then mixing both mics on the same channel. So the only information that wasn't canceled was the voice.  This gave me an idea. I took a handset and added a mic facing backward from the existing mic. Then wired the second mic out of phase. Apparently there's more to it electrically then just wiring the other mic backwards because the handset went dead. Is this possible with just parts salvaged from old phone equipment?

Posted by AJRimmer 5 years ago

LEDs are putting static on my stereo?

I wired a outlet so I could plug in a strip of LED lights that are able to run in different modes (flash, fade, different colors, etc) When I turn the LED lights on, the stereo, that is plugged into a different circut, has static that goes with the tempo of the lights. When I turn the lights off there is no static. What gives? Here is what I got. I used them in another part of the basement and they work good with no problem. i also checked the outlets with the 3 light tester and it says it is wired correctly.

Asked by rodsteryz 6 years ago

Active Noise Cancellation for cars not equipped

I am playing with an idea. Higher end cars come with active noise cancellation systems to make the drive quieter and more enjoyable. However compact and subcompact class cars do not. With the noise canceling technology is available on every shelf for headphones, I am wondering if this could be hacked and repurposed to reduce road noise in a car. The system (Im presuming) would require one microphone, one noise canceling circuit board, and one speaker per wheel well. So it would require two pair of noise canceling headphones to accomplish. The idea is to improve the cabin noise quality in an off the shelf kind of way. Currently there are no aftermarket systems within the normal financial reach of most people. Only a hand full of aftermarket systems out there are available and priced @ 4K USD or more. If this works, it could be marketed at around 100 USD per unit. And provide a much nicer driving experience to the compact and subcompact cars.  By placing the microphones under the carpet and on the wheel wells metal surface the system should ignore the stereo, and correct road noise transmitted from the wheels to reduce cabin noise. Stereo interference is a common problem with cabin mounted microphones on OEM systems. So, your mission if you choose to accept it, is to devise a way to reduce road noise in a compact or subcompact car using off the shelf noise cancellation circuitry available to the average person. If your successful this should be a very easy way to upgrade most cars not equipped with such a system. Having a noise canceling system in a car reduces noise fatigue, and improves the driving experience for all of us.

Posted by ydeardorff 4 years ago

removing power supply noise from my bluetooth speaker

Hello guys, so i made this bluetooth speaker and when i hook everything up and runing i get this weird noise from it im pretty sure it has something to do with the voltage step up but im not sure how to remove the noise would be great if you could help :)  yeah yeah i know the schematic is pretty epic, lets pretend that the two amp audio input and bluetooth dongle audio output are connected, and ignore the fact that there are no switches and stuff like that pretty sure thats not hwat causing the noise.   i know that theres a way to remove noise by using capacitors but i dont really know how to use them. thanks for tips :)

Posted by VytasŽ 1 year ago

Does anyone know of a noise that can annoy my neighbors while they are in their backyard?

Every single day my next door neighbors go out to their back yard and make alot of noise ( screaming children, adults yelling and talking very loud, etc.) They know that this bothers all of the surrounding neighbors but they just don't care. I can't take anymore and before I move I want to see if there is a way to annoy them with some kind of high pitched noise so they will be forced to go inside. Help! Thanks!

Asked by 8 years ago

How to reduce noise like baby crying in my home office so I can work on the telephone from home?

I will begin telecommuting and I have a 2 month old baby and a 2 yr old.  A noise cancelling mic will reduce some sound but I want to make sure customers can't hear my household noise coming from other parts of the house.  What can I do to reduce sound to the home office I set up in the extra bedroom?  I am in a rental property and cannot make permanent structural changes.

Asked by Rasheeday 5 years ago

How does this mysterious noise work?

There’s an elementary school on the next block about 100 feet away from our house. Everyday from monday until friday, the noise coming from this school wakes me up about 6.30 am. What puzzles me is how could the noise reach me when our house is inside our block and the school isn’t even facing our block! -also how the noise could be ignored by the school’s nearest neighbors when it’s so loud at 100 feet away. Another thing is the voices I hear are too big and loud for elementary age students but I don’t see any high-school aged teeners at the school. And the greatest mystery is that I only hear the noise inside my room -never outisde! I know there’s a scientific or audiological explanation for this but I also know that getting the answer would take a lot of time and I just don’t have that. Can anyone give me the explanation for this?

Asked by pochsp 7 years ago

Active Noise Reduction as Software--possible?

While on vacation last week, I was trying to watch a sophisticated, complex movie (something with Muppets) on a laptop and was having trouble hearing the audio through headphones, due to the general loudness of my family.Is it possible to actively reduce noise through computer software? I assume that the programming itself would not be too complex, but I don't know if the time taken to process microphone input and use it to modify audio output would be too slow. The only place I found through Google that discussed this was a forum wherein the members couldn't get past the concept of attaching a microphone to a headset. I also found a schematic with instructions for building headsets, but I would prefer a .exe file.

Posted by CameronSS 9 years ago

my sisters old stereo system seems to be making a 'ttit' noise when i listen to a song with bass. Please help!

it sounds sorta like a small piece of meatal rataling (or a spark jumping through the air) . the speakers are nice sony speakers but are old and have been out in an OLD barn. the speakers connect bye a wire in a clamp. there are two different rows that have a red and black wire ports, but only one row works. please help?!?!

Asked by jayman242 5 years ago

Noise cancelling megaphone

Hello all:) I was wondering if I could get some help and advice about a project I've had in mind for a while. The idea is to use a modified electronic megaphone to produce sound that's antiphasic of the microphone input. I want to keep the execution as simple as possible to retain signal quality and keep it something I might be able to do myself with a little studying up. I got the idea when I noticed if you incorrectly wire a couple speakers one can produce output that's 180 degrees out of phase, cancelling most of the sound emitted. Ultimately I'd like to use the device to help quiet the sounds of the power tools I use as a favor to my neighbors and to save my hearing a bit:) This should be doable since I could keep the megaphone near the source. Thanks a bunch for any help, Pete

Posted by wolf35nine 5 years ago

Job - Silence your neighbour

I want someone who can actually create the setup described here -  My neighbour is very noisy and they don't decrease it no matter what. If someone can build the setup or come with their plan to achieve the goal, I can pay whatever you demand.  My neighbour has 3 loudspeakers and 2 big-box speakers. He uses an amplifier with a CD in it. He also uses few mics sometimes for his band to sing. they sometime sing for 24 straight hours.  Please help and advice.

Posted by VikasS6 3 years ago

60 cycle hum in a power supply

I recently scavenged a 5 VDC phone charger to use as a power supply for my small FM transmitter. I have the transmitter plugged into the computer so I can listen to my favorite internet radio station on the stereo in the living room, rather than only in the office. The whole thing works really well, except that during quiet songs or in between songs, I can hear that 60 cycle hum coming from the radio. Does anybody have any suggestions (cheap, free, or re-purposed parts are a plus) on how to minimize this? I don't want to spend money on this, and simple is my favorite adjective with electronics projects. Can I put a capacitor across the + and - wires to smooth out the power? If so, what size would be good? Thanks for your help! ~PC

Posted by Poppa Chubby 8 years ago

Fix noise in amplifier?

 recently make a lm386 amplifier  test it with battery and my eleminator power supply it is working fine. i also add a filtering capacitor. But when I connect it to a 12v adapter it marking some hum noise .So how can I repair it?

Asked by Soumojit 2 years ago

How do I obtain a noise permit or discretionary license in Phoenix?

I can't seem to find how to obtain one of these two documents from the city of phoenix (or maricopa county, as this might be a county issue). 

Asked by A_of_s_t 8 years ago

Is it possible to cancel out sound using hi-fi speakers? Answered

I know that noise cancelling headphones exit but is it possible to scale that up and have the out-of-phase noise played through speakers?  If so, and the microphones were against the wall of the offending neighbour and the speakers were to be aimed at that wall, would the noise be noticeably reduced? Thank you.

Asked by FriendOfHumanity 8 years ago

How do I make a noise-detecting traffic light?

I am not sure how many people have seen these, but they are used in Elementary school alot. Basically, when the light is green the noise level is at the right level, if it is yellow it is getting a bit too loud and red is WAY too loud. I want to use this type of idea in my classroom. It doesn't have to be a traffic light but a series of light. I just don't know much about wiring.

Asked by MrFish7 9 years ago

Slowing a noisy handheld fan?

I am trying to slow a battery-powered (two AA batteries) handheld fan. It's obnoxiously loud for my project, but slowing it to about half speed will help cut the noise. I think running a resistor somewhere in the circuit will do it (planning to lengthen the wires anyway, so physically adding in isn't the issue,) but frankly there's a reason I'm in art instead of engineering. I've looked at the online calculators, but they want the amperage of the motor, which I don't know. What kind of resistor do I need?  Or is there another way to slow or quiet it down?

Asked by jblanc 4 years ago

How can I fit a Semi Truck horn onto a bike or a Vespa? Answered

Infmom on Lifehacker had an idea here - - and personally I think it might safe a few lives. I'd love to hear anyones' thoughts on this.

Asked by Aquilla 8 years ago


How could I sound proof my room? Particularly against the "bass" end of the spectrum? I know you can use foam panels that are cheap enough but would they also help absorb the bass too? I'm getting tired of my parents yelling at me whenever I play music. I don't nessesarily play it loud, but with my subwoofer on, it goes low enough to rattle through the whole house even at low levels. I'd like to make this a competition, the best idea I will pick out and do to my room, I may even think of a prize.

Posted by Punkguyta 10 years ago

Ground loop question? Answered

Hello , im making a little guitar amp with ROG tonemender as preamp and tda2003 power amp.This is my schematic , can you check it for me please!. Will it get ground loop problem ?? My English is bad so i can't understand clearly some documents about ground loop. i have 2 seperate board (a power amp based tda2003 and a ROG tonemender as preamp).They will use the same power supply .some thing like this picture and this is schematic Thanks!

Asked by login721 6 years ago

I have built the "Sweet Portable Guitar Amp" but there is a very load hiss.? Answered

I have built this and its working fine, except there is a very load hiss along with the audio. I have only made 1 modification: I have connected the negative terminal of the battery to the 2nd signal of my stereo 1/4 inch socket, and the ground to the ground circuit ground. This causes the circuit to turn on when a mono jack is plugged in. Any ideas why I am getting this hiss? It sounds a bit like static on a TV but I have used shielded cable. Thanks

Asked by geniass 7 years ago

Sounds with electronics

So here goes, I am trying to figure out how to make basic sound generating machines. Preferably generating a sound that can be modified with a potentiometer or something of the sort. The principle is simple, these will be for messing around, possibly, if the result is good, using in some random recordings of mine, so most of the machines will have a jack out plug. Anyhow I was wondering, what, in a circuit, actually makes sound, what is the base of all sound generating electronic devices (synth, analog stuff, beepers) what actually creates the wave, the current that is sent to the speakers? Have I just answered my own question by saying current? Is it just the electrical current, and putting random resistors, capacitators, potentiometers and stuff changes the sound that is generated? Any help is more than welcome! and if anything good comes of it, I'll post some sound clips!

Posted by gavox 6 years ago

How can I make a mechanical white-noise generator (sound conditioner)?

I would like to be able to make a white-noise generator like this one but I do not know how I would start.  If anybody has any suggestions, that would be fantastic.   If you do not know how to make a mechanical version but do know how to make an electronic one, that would still work, but mechanical would be preferred.  

Asked by j626no 7 years ago

Can any (Physicist) explain this laser-weirdness that I'm seeing? Answered

I've got some cheap-o red-lasers. Up close on surfaces I see what looks like old-fashioned monochrome TV static in miniature* (and red). Other people see it too, I think it's some kind of "Quantum-noise" but would like other opinions. L *I don't like looking at it - it reminds me of this.

Asked by lemonie 6 years ago

how do you PROGRAM a batch file to make sound?

I think it is time we all knew how to do this long asked Question if someone posts a good batch i will test it and post my comments

Posted by Laserman595 8 years ago

Does anyone know how to make a dynamic normalizer? Answered

I need to make one for my parent's TV so that the commercials don't deafen them! A dynamic normalizer smooths the volume levels between commercials, songs, etc. so you don't have to change the volume.

Asked by Argon27 8 years ago

Need help with change value of capacitor in tone control?

Hello .im making a TubeScreamer TS808 clone. In the original schematic they use 2 0.22uF Tantalum capacitors, but i don't have them, so i replace with 0.22uF Mylar capacitors.The result is when i turn the tone pot up, i get noise and loud hiss. Can i replace the 0.22uF Tantalum with 1uF Tantalum then change the value of some resistors to make the tone pot to work ?This is the original schematic and my modified version .I not tested it yet because i have to order parts to build it.Can you check it for me please! Im beginner and i dont know what part i have to replace if i replace 0.22uF capacitors with 1uF capacitors. Thanks! and sorry for my bad English!

Asked by login721 6 years ago

how to kill the loud annoying boom boom from cars?

i am wondering is there a way of over riding speakers to play my own music or just stop the boom boom coming out the car in front at traffic lights? i remember a broad band am frequency was mentioned once at one place of work but need your knowledge.?

Asked by patternbill 7 years ago

Sound effect button?

I'd like some instructions on how to make a button that plays the same 2-3 second audio sound when it is pressed. It should be able to last for a pretty long while if you know how to do that. I want it to look like it's DIY and not from a factory but also good enough that someone would put it on their desk.  I need the cheapest possible way to do this as well as instructions for a dummy who doesn't know much about technology. Thanks to anyone who can help!!

Asked by Tofus 11 months ago

I'm selling build your own mini synth kits

Hi, I'm selling kits of an Instructable I made to build your own synth. The EM-Tronic: This kit provides you with the components and instructions that you need to build a small handheld digital synth. All you need to do is build the kit and find an enclosure to fit it into. I'm selling them on Etsy: Here is the Instructable if you want to build your own: Cheers, Brian

Posted by rarebeasts 6 years ago

Cell Phone Noise in FM Transmitter

I have recently built a dock for my HTC touch for use in my car. The dock is basically a holder with a cheap FM transmitter in the back. The FM Transmitter and cell phone are connected in parallel to a 5 volt USB car charger. For some reason, the FM transmitter is picking up noise from the cell phone. It is digital noise, different frequencies and beeps that vary depending on what I am doing on the phone. The noise is very quiet, but still there. Is there any simple solution to filtering out this noise? Will a simple capacitor do? Thanks Andrew

Posted by computerwiz_222 8 years ago

Piezo buzzer won't work? Answered

I have a couple of Piezo buzzers that I bought from the Adafruit shop, but when I connect them to a power source, they don't buzz or make any noise... Am I doing something wrong? Or am I not doing something?  Heres the link to the buzzers I have:

Asked by Zem 8 years ago

need help with using one power supply to power multi guitar pedal? Answered

Hello . i have two DIY guitar pedal , they work normal in a chain and each of them use they own power supply( 9v AC-DC adapter).Now i want to use one power supply to power both of them.So , i wire them like the picture bellow, and i get the 60hz noise. Can you please tell me how to get rid of that noise. Thanks in advance ! sorry for my bad English.

Asked by login721 6 years ago

air mattress pump silencer

I have a big air mattress that I use frequently, but the electric pump is so loud that the apartment neighbors complain.  It takes 3-5 minutes to inflate, which is an eternity of noise when you're setting things up at night.   I just wondered if there might be a way to dampen the sound without having to use a foot pump or just leave the mattress inflated it at all times. Any ideas, anyone? 

Posted by kennan 2 years ago

how to avoid ground loop when use one powersupply for multi guitar pedal? Answered

Hello . I going to buid a guitar pedal witch have 2 boards in a box and use a power supply to power both of them.But i dont know how to wire them to avoid groound loop problem.Normal i will do like the picture below .Do i need to cut any wire to avoid the noise ?? Thanks for advance! sorry for may bad English!

Asked by login721 6 years ago

Piezo Freebies?

I know there are lots of websites were you can get free electronic parts and sample. I am looking for some piezos and I was hoping I could find them on these sites, but I'm having trouble. Any suggestions? Any sites that have them?Any help appreciated.?

Asked by mkupps 9 years ago

Portable Guitar Amp Hiss

Hi all, I have built this design with a few modifications to accommodate for the parts that I already have. I used a stereo 1/4 inch stereo jack, but I connected the 2nd signal to the battery negative and the ground to the circuit ground. This way the circuit switches on when I plug in a guitar. I also used headphones only instead of a speaker, so I don't need a switch. Now the circuit works and it is amplifying the sound, except there is a very load hiss. I am assuming that a certain frequency in not being filtered out but this may not matter when using a medium quality speaker because of its low frequency range. However high quality earphones can play this sound. Is this correct? Does the headphone work for anyone with the hiss? Thanks in advance

Posted by geniass 7 years ago

Soundproof Sleeping Closure

Hello fellow instructables :) Right I need some help and advice on a design brief to help fix my problem. Problem - I live in a ground floor flat and there is 1 flat above me, 2 scum bags occupy it, a couple of 22 year olds and they have obviously never been taught consideration for others and they bang and thrash around all through the early hours of the morning. When they bang on their bare wooden floor it sounds like a heavy metal dumbbell coming through my ceiling and it wakes me abruptly and its ruining my life :( I've complained to the council the past 18 months but there not interested. They have not put any carpet down in their flat in the last 18 months and it looks like they have no intention of doing so (they can afford fags n booze tho), plus they have a baby due any day now, great.. so now there making their problems, my problem. Solution - The only thing I can think of is making a soundproof sleeping closure, a large box like a 4 poster bed but all sides solid made out of a layer of MDF then insulation then more mdf, but I have some questions before I start. How would I get adequate air in and out ? Would this even stop the banging on my ceiling waking me up ? or would it still penetrate the box ? How would I control the temperature, would it be too hot in there ? Something like the image below but more solid with a door. If anyone has any experience with this or input or any good ideas I'd be ever so grateful. Cheers in advance. Matt

Posted by mattdiy 3 years ago

Help with some noise filtering? Answered

I've attached a file of a project I will build, but should I need some noise filtering capacitors? Thanks, BoK

Asked by Balls of Kevlar 6 years ago

Why is my 555 timer keyboard starting with noise? Answered

Hi!!! :/) I have made a 555 timer keyboard using a tactile button series with resistors, but rather than staying silent until I press a button, it makes noise as soon as I start it. All the buttons function properly, raising the note in intervals but it starts with sound. I have thoroughly searched my button/resistor series for accidental bridges between joints but have found none. This is my first "real" soldering/perfboard projects, so mistakes could have been made! Could there be any other reason for this noise? I cannot find somewhere else where the circuit may be completing. I have included the schematic I am using. Any help would be appreciated ]:>)  Thanks!!!!

Asked by ToggleSwitch 10 months ago

Add simple tone control problem Answered

Hello , i have a problem when im making my portable amp.I use the little MK2 schematic , but i want to add a simple tone control , then i place the tone control between buffer output and power amp.But the problem is noise.When i turn down all knobs (treble,mid,bass) the noise decrease but still noticeable.When i turn up the Treble knoble the noise is very loud .I dont know why and how to fix it.Please help! Thanks very much ! sorry for my bad English.

Asked by login721 6 years ago

Do Nickel-Metal Hydride batteries make a quiet popping sound when recharging? Answered

          I am recharging my Ni-MH batteries today (Wii-motes eat them up fast!) and I was wondering if it is normal to hear a quiet popping noise coming from the batteries? it sounds like tiny bubbles popping--very similar to the sound carbonated drinks make after being poured out of the original container.         I believe this noise is a result of the reversing chemical reaction being created inside the battery. the batteries shown below are my exact brand and model.         Is anyone else experiencing this phenomenon? If so, do you think it is normal? Leave your thoughts, comments, and otherwise below!      =D

Asked by jensenr30 7 years ago