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Noise Maker

What makes this thing tick, is it the black dot in the pic and if so where can a person by this or at least make it louder on 9volts.

Topic by wisconsinjimmy    |  last reply

Noise or Music?

The "Bose" sound system is based on chamber resonance like that of musical instruments. This is the difference between a whistle and a flute. The mouth piece of a trumpet is raw without its additional plumbing. The noise of a piezo-electric sounder is raw, but chambered to resonate...better. A trumpet is basically an acoustical waveguide device. Consider this and lets see if you can "WOW!" the crowds with your sounds. The trumpet mellows the sound of the mouth piece by reflecting the sound repetitively off the inside walls of the horn. The angle is low so the acoustic wave reflects many times along the length. What works for you?

Question by robertgrist    |  last reply

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?

Question by Soumojit    |  last reply

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

Topic by wolf35nine    |  last reply

Relay causing noise

I have an Arduino Due switching some relays and one display lcd 20x4 connected on Due I/Os too, and when the relays are switched shows some noise characters in the lcd, how to reduce or to end with it? I tried to use 100nF but didn't work.

Topic by MPinhoCODE    |  last reply

Bird scarer - with noise

I'm looking for any ways of building a repurposed material bird scarer. Not a visual scare (scarecrow, CDs/foil, silhouette) but something that makes a bit of noise. I know a keen allotment owner who has purchased an air gun to shot into the air and scare parakeets ! He would hate to actually hurt a bird - and I feel there has to be a better way. Rattles - tape recorders that can be set outside, wind powered stuff ? Anything that might stop my friend eventually hurting himself (I'm also concerned about the effect air gun pellets could have on the soil). Thanks for any suggestions. Victoria J

Topic by Victoria J    |  last reply

Oscilloscope PSU whining noise?

My oscilloscope is a Philips PM3055. It's a CRT type with a modular internal design, one PCB is the PSU, one is the front panel, a few are TTL, etc. When I try to turn it on the screen is blank and the PSU makes a whining/whistling noise, and does not function. The whining persists regardless of connection to other boards and mains ground. (mains ground is normally not connected to the PSU, but there's a connector) I have found no bulging/leaking capacitors (though I have no way of testing capacitance) or other visible damage, except for cracked plastic on the front panel. But that's merely cosmetic. Replacing the PSU is not an option, since the scope is old and obsolete. Neither is buying a new scope. I am broke. All help greatly appreciated! If you help me fix it, I might just send you one of those fancy patches. I can only provide cellphone-camera quality pictures at the moment, and for that I am sorry. [Edit / update] I contacted Advance Product Services, And they sent me the complete service manual for the scope, free of charge. Those guys are awesome!

Question by Tinker_Tom    |  last reply

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

Question by Balls of Kevlar    |  last reply

I want the background noise!

I have a recording of a conference call I have to transcribe. Unfortunately the recorder was placed near a noisy co-worker, who has become the main sound during the recording. Is there some way to pull out and enhance what is now the background noise, my important call?

Question    |  last reply

Shure Noise Isolation Phones

I have Shure e2Cs. But i've always wondered what the difference was between the g (gaming) series, and the c series. EG. The difference between the e2C and the e2G. I though someone here could tell me. -Regards

Topic by evy-wevy    |  last reply

Noise filter on iPod dock

I recently completed a project where i made my own iPod Touch charging dock for a set of PC speakers. While testing it out i noticed there is some background noise/feedback coming through the speakers any time the iTouch is actually charging. Is there any way i can shield against this interference? Or is the proximity of the headphone jack to the iPod connecter to much of a problem to overcome without alterations to the iTouch itself? I've notice this problem before while listening to my iTouch through it's speaker or headphones when it was plugged into a wall charger or PC.

Topic by mpilchfamily  

Something is making a mysterious noise.

So it's been awhile! Between school, homework, work, and playing with gadgets and such, I haven't gotten the time to post or make an instructable for quite a long time. But now, I'm back with a question. I see lots of new users here, and to them I say welcome to the community! You are going to love  it here, everyone is helpful, and you'll find answers to just about everything. I also see some members here that were around when I still used instructables. Remember me? How are things? :P Ok, so now for my question. A few weeks ago, after flushing the Toilet, a strange noise began behind our refrigerator. It was king of like a rattling, but not so much that as say, a prize wheel at a gameshow spinning and hitting something heavy. It's really quite odd. The refrigerator is a model with the built in water and ice dispenser. I googled it, and many seem to say it is something called "Pipe Rattling", but I don't think that is what it is, because it only started a couple of weeks ago and we have had this fridge for a year. I have drawn a diagram of the first floor of our house to help you get a better understanding of where the fridge is in comparison to the bathroom and the toilet. Like I said before, the noise only occurs after we flush the 1st floor toilet. Another odd thing about it is when the noise occurs. It can make this rattling as the toilet is flushing, directly after the toilet has flushed, and it has happened up to a minute after the toilet is finished flushing and refilling the bowl. The noise goes for about 5-8 seconds each time, and it only sounds once after each flush. We have not made any additions to the house before or since it started, have npt experienced any severe weather, and have not modified any plumbing in the house in quite a while, and never in that area of the house. In the incredibly bad sketch I made, you can see the bathroom, and the incredibly bad drawing of a toilet. The fridge is indented in the wall so there are cabinets surrounding it. Any thoughts on what this noise can be?

Question by kcls    |  last reply

Noise Pollution B-Gone?

I liked the TV-B-Gone Instructable, it was entertaining and informative. Now I wonder if one could "snipe" one's neighbors' stereo set while they are playing Slipknot full blast at 3 am? (Calling the cops only does so much, I'd rather hit a button and go back to sleep.) I only have the most vague understanding of EMP technology, is that a possible/plausible implement for a solution? Or is there something else?

Topic by V-Man737    |  last reply

Signal-to-Noise Ratio Not Good

Dear Look, I respect's right to make a buck as much as that of any other site that proffers user-supplied content, so please don't misunderstand this comment.  I'm not decrying the presence of ads on I'm bothered nonetheless.  Until recently, when I landed on the home page, I would see two columns of fascinating, deliciously creative projects.   When I visit the site now, I find that the page is dominated by ads.   Dominated?   Yes.  Now I have to scroll before I see *any* actual Instructables.  Now in the interests of full disclosure, I'll confess that I've got a mere 800 pixels of vertical resolution to work with, but come on folks, no Instrucables above the fold?  Really?  And I've noticed with some dismay a growing number of featured projects from external commercial sources like This Old House (of which I am a *huge* fan, btw). I'm not calling for a moratorium on ads on Instructables, or anything absurd like that, but I do feel that the kind of projects that make this site truly great (those from individual makers, crafters, and builders) is beginning to get crowded out.  Keep the ads, by all means, but please keep the spirit of personal creativity in focus as this amazing site evolves. Thank you.

Topic by jdtwelve12    |  last reply

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

Question by Melara    |  last reply

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!

Question by lpm    |  last reply

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.

Topic by ydeardorff    |  last reply

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?

Question by pochsp    |  last reply

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.

Topic by CameronSS    |  last reply

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

Topic by computerwiz_222    |  last reply

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

Question by bobdabiulder    |  last reply

Window A/C Making Bubbling Noise

We just got window air units for our house. Mine appears to work fine, yet it's making a strange bubbling/gurgling noise. It is tipped and draining. Any idea fellas?

Topic by mikesty    |  last reply


I just finished rebuilding my Audi 80, 1.8 engine in which I removed the Valves, removed all stuck carbon, watch with petrol and reset in orderBut when I started the engine, I noticed unwanted noise from the cylinder. I hate this noise from the valve, please what can I do again?

Question by degosh    |  last reply

electromagnet gauge makes buzzing noises?

Hi, i've been working on a project that involves reusing the electromagnetic needles commonly used in 90's era ford gauges. i can get it to work fine, but it seems to cause a buzzing noise as it is doing the work. there are three pins, ground, power, and signal. right now i just have it working off of 5v. when i have it going, and you hold the needle with your finger, you can feel it vibrating. i'm using an arduino nano, a npn transistor, and the gauge with a PWM output. do i just need to put a capacitor in? or how do i keep it from buzzing like it does? its not a loud buzz, but you'd notice it if you were in a quiet room.

Question by zack247    |  last reply

How to eliminate noise in FM transmitter? Answered

I had made a FM transmitter using IC NE555. When i power the circuit with 9V battery,the transmitted audio is clearly received in my radio receiver.The problem is the battery will soon drain out and also as the battery starts to drain the transmitted frequency changes without my knowledge.So as the battery voltage decreases the frequency is also changing.To eliminate this problem i used transformer powered source with 9V Regulator 7809.When i power the circuit with transformer the received audio signal on my radio receiver has so much of noise added.The audio quality which i transmitted is completely lost.Anyone Help me to resolve this problem.

Question by Rajkumar2506    |  last reply

Digital noise in battery powered system Answered

Hello, while building a Bluetooth speaker based on this instructable, I ran into some problems regarding noise. There already exists a question regarding this problem here, but it is a few years old, and it gave me no solution. The power source for this project is a self constructed battery pack consisting of 4 18650 battery's soldered to a battery protection circuit (just like in the instructable). The PAM8610 (black version) amplifier board, however, can't take 16.8 volts so a voltage regulator is placed in between set to 12 volts. Same story for the Bluetooth receiver board (KRC-86B V4.0), but with a voltage of 5 volts. All fine and dandy till there. The KRC-86B has an input for a 3.5mm jack connection and an output. The output is a pass-trough of the 3.5mm input unless a Bluetooth connection is present, then the Bluetooth signal will overwrite. Here's the problem: whilst the connection using the 3.5mm jack works fine, creating a Bluetooth connection results in a very annoying digital noise. This noise is there instantaneously and is the same on all volumes of the host/transmitter. If no music is being played by the host for around 15-20 seconds the device seems to enter a power saving mode and the noise changes to a regular beep. This is way less bad, but of no use because it is replaced again by the bad noise when the music starts again. I have tried a diversity of things, listed here with their effects: Action: wrap the Bluetooth receiver in electrical tape and aluminium foil. Result: nothing much, it didn't even block the music. Signal was only blocked by three layers, a few meters distance and my body in between my phone and the receiver. Action: lift ground in signal between Bluetooth receiver and amplifier. Result: noise gets slightly worse, no change in tone, only amplitude. Action: moved away from my computer, as to avoid interference. Result: nothing at all. Action: tried another Bluetooth transmitter, PC instead of phone. Result: - Action: broke the previous board at the start of this project by heating it too much in the attempt to change a wire. Result: noise was also present at the first board which I did test by hooking it up to the line-in of my computer. Though that could also have been by the ghetto set up I used. The 3.5mm cable was poorly connected, trough a breadboard. Taking my multimeter and measuring the difference between negative of the battery and GND of the voltage regulator for the amp gave a 6.0 mV reading. The same result is achieved when measuring between battery and GND of the regulator for the KRC-86B. The potential between GND of the signal and the GND of one of the regulators was 0.1 mV. I understand that you might want to hear the noise, so I recorded it: link. It is very soft, but audacity doesn't read .m4a files, and turning up the volume works just as well. Please let me know if you have any idea's on what could solve it and/or if you need more info. Thanks in advance.

Question by arduinefier    |  last reply

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 ?

Question by Squibo    |  last reply

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

Topic by fungus amungus    |  last reply

cutting sound from noisy neighbor

How to stop noise coming thru adjoining wall from noisy neighbor

Question by boss44    |  last reply

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?

Topic by AJRimmer    |  last reply

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.

Question by rodsteryz    |  last reply

My pc Speakers make a buzzing noise? Answered

My speakers have always made a weird noise it is more of a patting noise. And it really gets on my nerves when I try to listen to music and the noise is louder then my music? I know it is not a louse wire because I opened up the speakers and checked all the wires. But the  weirds part is when my cell phone is beside the speakers, if someone sent me a text my speakers will make a loud buzzing noise before my cell phone even rings? The are just basic speakers made by CA. Some one please help :)    

Question by Aaamazzara    |  last reply

How to reduce signal noise in a circuit (for Amplifier)?

I am building a sound reactive RGB light. Using a LM386 and a 16f88's AdC. I got it to work great with just 1 RGB LED on a breadboard, powered from a 7805 I then built it on perfboard, watched the amp's output on my O-Scope, worked fine. this schematic for LM386Once I hooked up 3 Constant current regulators with 3x 3 watt LEDs(red-green-blue) through 3x MOSFETS, the Amp's output signal becomes blurry/chaotic and the light malfunctions. The regulators negative output must be connected to logic GND, which i know to be where the interference is coming from.How can I reduce the noise coming out of the Amp? Even if I gotta use different type of Amp. I don't know to much about them.

Question by PuffMag1cDrag0n    |  last reply

Fix Noise in usb mp3 player kit

I recently buy a usb mp3 player kit I search internet about its connection and I connect all thing correct to my amplifier .  My  amplifier s good but there is lot of noise in the song I cant hear it properly So what  I do?

Question by Soumojit    |  last reply

Noise in Amp from LED Strip & servo

Hi, I am working on a project in which TL072 is amplifying an audio signal which is going to speakers & arduino analog input. Amp is powered by a wall wart with 12V 2A output. The same 12V is also regulated to 5V and used to power an AVR. The AVR is being used to PWM, using a power transistor(TIP120), an LED strip taking 1A from the same 12V supply. There  1) Now the rapid switching of current for LED strip is messing up the amplifier output. It's working fine with LED Strip off but when using PWM, there is a high frequency noise in the amplifier output. I have a 0.1uF and 10uF caps near power inputs for both AVR and amplifier. This is probably due to insufficient decoupling. Can someone please help me make it better? 2) There is another independent source of noise I'm finding which I'm unable to explain. The audio is going into Arduino which is controlling a servo as well. As soon as the servo is connected, there is a constant loud noise in amplifier output. This remains even after powering the arduino and servo using seperate USB supply(only ground connected). I placed audio setup and servo data wire far apart since they may be interfering due to PWM used for servo, but it wasn't of any use. Since in both cases, amplifier is producing noise, I think my amplifier diagram might be at fault. If I remove the amplifier, the audio stream reaches arduino without any noise . Anybody got any ideas how to remove these 2 noises? Attached images: amplifier schematic, graph of audio input in Arduino analog pin. -Antzy

Topic by Antzy Carmasaic    |  last reply

Could you convert noise pollution into energy? Answered

Since Microphones turn sound energy into electrical energy, you think you could generate any usable amount of electricity from an array of dynamic or piezo microphones near a noisy intersection or metropolitan area?

Question by action_owl    |  last reply

why wont my computer make noise? Answered

My computer(windows 7 laptop) is 3 or 4 years old and recently YouTube did not work we fixed that but now there is zero sound coming out of it speakers headphones you name it and windows media player says something like this:  Windows Media Player cannot play the file because there is a problem with your sound device. There might not be a sound device installed on your computer, it might be in use by another program, or it might not be functioning properly. Any help appreciated!

Question by FarmerKJS    |  last reply

Noise cat scarer device with with motion detection

I need a cat/pet scarer device.  Main problem: Indoor housecats scratch bedroom doors during the night.  Observations: I''ve had partial success with a comercial product called "Ssscat Cat Spray Control System". It uses motion detection and a bottle of compressed air, shooting a burst of air on detection. The concept is good, but it's not easily available anymore and was a bit expensive. It seems that cats are more scared of the sound it makes than the burst of air.  Ideas: I was hoping to use a "Pyroelectric Infrared IR Motion Sensor Detector Module" and a small audio speaker to make a static sound (white noise) to accomplish a goal similar to commercial solution. A sound loudness slightly above normal talking sound would be enough.  The sound legth should be about one second. Maybe two LEDs lighting at the same time would also help. I would need about 2-5 such devices. They would have to be battery operated with an on/off switch.  Could such devices be easily built from components? If so, I would need on finding the right components and instruction on building the device. I have only basic skills like soldering and tinkering, but I don't know how to design electronic devices more complicated than simple LED projects. 

Topic by Vesa Seppänen    |  last reply

Arduino/ESP8266/servo noise when idle

Hello everyone My project involves a robot with LEDs, servos and an Arduino with a Sparkfun ESP8266 shield on top. Everything else works fine, I send web requests to the robot and LEDs are blinking or the servos are moving. The problem is that when idle I have noise on the servo. I have tried  1. Pull-up and pull-down resistors 2. Providing external power to the servos 3. Putting an aluminium foil between Arduino and the shield and the problem persists Commenting out parts of my code I isolated that the noise appeared upon uncommenting this part of my code void serverDemo(){ ESP8266Client client = server.available(500); } but I cannot understand why.  Could you please propose me any idea? Below I have the entire code #include #include #include const char mySSID[] = "xxxx"; const char myPSK[] = "xxxx"; ESP8266Server server = ESP8266Server(80); Servo myservo1; Servo myservo2; int pos = 0;    // variable to store the servo position int pos2 = 180; int led1 = 12; int led2 = 13; const String html = "HTTP/1.1 200 OK\r\n" "Content-Type: text/html\r\n" "Connection: close\r\n\r\n" "\r\n" "\r\n" "\r\n"; void setup(){ Serial.begin(9600); initializeESP8266(); connectESP8266(); displayConnectInfo(); serverSetup(); myservo1.attach(11);  myservo2.attach(10);  pinMode(led1, OUTPUT);     pinMode(led2, OUTPUT); //testing myservo1.write(45);   delay(15); myservo1.write(80);       } void loop(){ serverDemo(); } void initializeESP8266(){ int test = esp8266.begin(); if (test != true) { Serial.println(F("Error talking to ESP8266.")); errorLoop(test); } Serial.println(F("ESP8266 Shield Present"));} void connectESP8266(){ int retVal = esp8266.getMode(); if (retVal != ESP8266_MODE_STA) { retVal = esp8266.setMode(ESP8266_MODE_STA); if (retVal < 0) { Serial.println(F("Error setting mode.")); errorLoop(retVal); } } Serial.println(F("Mode set to station")); retVal = esp8266.status(); if (retVal <= 0) { Serial.print(F("Connecting to ")); Serial.println(mySSID); retVal = esp8266.connect(mySSID, myPSK); if (retVal < 0) { Serial.println(F("Error connecting")); errorLoop(retVal); } }} void displayConnectInfo(){ char connectedSSID[24]; memset(connectedSSID, 0, 24); int retVal = esp8266.getAP(connectedSSID); if (retVal > 0) { Serial.print(F("Connected to: ")); Serial.println(connectedSSID); } IPAddress myIP = esp8266.localIP(); Serial.print(F("My IP: ")); Serial.println(myIP);} void serverSetup(){ server.begin(); Serial.print(F("Server started! Go to ")); Serial.println(esp8266.localIP()); Serial.println();} void errorLoop(int error){ Serial.print(F("Error: ")); Serial.println(error); Serial.println(F("Looping forever.")); for (;;) ;} void serverDemo(){ ESP8266Client client = server.available(500); if (client) { String req; while (client.connected()) { if (client.available()) { String c = client.readStringUntil('\r'); req += c; Serial.println(req); if (req.indexOf("hands") != -1){ hands_up(); } if (req.indexOf("leds") != -1){ leds_flash(); } } } client.print(html); delay(1); client.stop(); } } void leds_flash(){ digitalWrite(led1, HIGH); digitalWrite(led2, HIGH); delay(200); digitalWrite(led1, LOW); digitalWrite(led2, LOW); delay(200); } void hands_up(){ for (pos = 0; pos <= 30; pos += 1) { pos2 = 180 - pos; myservo1.write(pos2);             myservo2.write(pos);             delay(15);                      } for (pos = 30; pos >= 0; pos -= 1) { pos2 = 180 - pos; myservo1.write(pos2);             myservo2.write(pos);             delay(15);                      } } Thank you!

Topic by ManosZ1    |  last reply

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 :)

Topic by VytasŽ    |  last reply

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!

Question    |  last reply

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.

Question by Rasheeday    |  last reply

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?!?!

Question by jayman242    |  last reply

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.

Topic by VikasS6    |  last reply

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

Topic by Poppa Chubby    |  last reply

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!!!!

Question by ToggleSwitch    |  last reply

Help! Magnetron in microwave oven makes jackhammer noise.

My microwave oven was out of order, it kept blowing up the power fuse; finally the trouble was traced to the power capacitor that was shorted. So, the power capacity was changed and the oven worked again, but now the magnetron becomes noisy with a jackhammer noise when it is working. This noise starts when the magnetron starts working, but it stops after some two minutes while it continues to work up to the time adjusted for it to finish its operation. What has happened to the magnetron? Is it possible to fix it? On the other hand, it is my best suspicion that it is the magnetron that is making the noise and not the transformer. What is your experience in this situation? This is exactly the sound (click on the link below) I am getting from my microwave oven, but it does not go and on until the machine turns off; the sound stops some two minutes into the operation, and the remaining time there is no longer the sound or noise – for the remaining time it keeps ‘quiet’ up to the completion of the time period it has been adjusted to operate, or I turn the switch knob to off. Thanks for any help or information.

Topic by Marius de Jess    |  last reply

My computer keeps making annoying beepy noises.

And has been doing so for the past 6 months. I have been able to deal with it for this long, but it has finally gotten to me. The computer is a HP Pavilion dv7 running Windows 7 Home Premium. It is not coming from the speakers, I think it is coming from the circuit board. I am sure it isn't coming from the speakers because 1) When the headphones are plugged in, the sound still comes, but not from the headphones (all sound reroutes to the headphones when they are plugged in) and 2) The sound still comes when the volume is turned all the way down. Please help, it is SO annoying. Thanks!

Question by kcls    |  last reply

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.

Question by MrFish7    |  last reply