A More Annoying Noise Maker (Version 1.0)

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Anything is possible with the 555 Timer IC. You can pick one up from Radio shack and all of a sudden a whole range of new micro projects open up. Most of which make lights flash or make noise....annoying noise......very annoying noise. It is for that application most people buy a 555 Timer, to annoy someone! In this Instructable I will show you how to build " A More Annoying Noise Maker". Using this circuit you will be able to not only make annoying noises, but be able to change the pitch and tone using two variable resistors. So in theory we are really creating a really cheap, annoying, cool noise generator. So lets get started!

Materials

555 Timer IC
Variable Resistors or a Adjustable Power Resistor, you will need two (your choice, choose one with only two pins if possible)
0.1 uF capacitor, you will need two (the ID number on the side is 104)
100 uF Capacitor
A speaker around 4 ohms to 16 ohms
A regular switch
solder
wire
9 Volt battery
a 9 volt battery clip
& A project box / case

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Step 1: Building the Circuit

Follow the diagram provided at the bottom. if you wire every thing together and remember your polarity and connect every thing to the right pins on the IC you should be set to test it out. Once completed the circuit (if fitted with a small speaker) can fit into a mint tin or another small case. FYI: The fourth pin on the IC is not used in this project.

Circuit Diagram Legend

C1: 0.1 uF Capacitor (marked "104")
C2: 0.1 uF Capacitor (marked "104")
C3: 100 uF Capacitior
Spk 1: Speaker of your choice
Sw 1: On/Off Switch
+/- 9 volts: 9 volt battery Terminals

REMEMBER TO CHECK THE POLARITY!

Step 2: How the Circuit Works

The timer acts as a switch controlled by the resistors on pins 6, 7, and 8. The resistors basically control the pulse, timing of pulse, and even the pitch and tone of the pulses (only in audio circuits). The capacitors are basically there to control the pulsing current so it does not do any harm to other components. Once a power source is connected the timers internal circuit starts to pulse, the variable resistors control that pulse right away and that signal is sent to the speaker. So instead of having to try out multiple resistors, you only really need to do is simply turn the dial of the variable resistor and set it to the sound you like; and if you don't like it a day or two later you can change it with absolutely no solder. Just a screw driver or your fingers!

Step 3: The Annoyance

Time for a test! Take it to your workplace or school and drop it in your emenys desk or garbage pail. If all works as planned you should hear them screaming and trying to find out where that noise is comming from. Another option is to just hold on to it and annoy others around you in a movie theather. Exactly what you do is up to you! Just remember to get a good battery so the sound lasts along time!

The video below is the actual circuit in use.

Step 4: Troubleshooting

If you don't hear a thing coming from your speaker its time to adjust or check the following:

-Too strong variable resistor.
-Short's Ex: two wires should be separate are touching.
-Solder bridges.
-wrong components.
-Too much or too little supply voltage.
-If you used a metal box to house the circuit I suggest you cover the inside with paper or plastic.
-Your components are damaged or really old.
-And you could have just followed the circuit diagram wrong.

If you still have trouble getting it to work leave a comment and I will try to assist you as soon as possible.

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44 Discussions

Is it possible to use this configuration to project a sound that is audible 100 meters distance? Would adding a larger speaker, amplifier and directional cone help to achieve this?

very nice instructable. Haven't built it yet, but I believe I can. No mention was made of the volume. Is it full volume or variable. How can you get more volume. Thanks again.

What about pin 7? Those arrows on the diagram dont really make it clear.

My apologies the arrows are what i thought would be a good representation of the variable resistors. the Arrow is the input, and the resistor par is the output. NOTE: project works best with variable resistors with two pins not three.

I made this as a first electronic  project to build and learn from and it's worked great. **Thanks for featuring this build** - I've tried other projects(with no luck)  and this is the first one I've had success with and have learned a little about the 555 in the process. So thank you for that.  Now I'm going to try fixed value resistors to set it to permanent tone/rate before turning it loose on the world! (also 2  variable resistors are too expensive to lose - or at least here in the UK - though it's also set me to thinking of starting to recover these from old equipment being thrown away) Can anyone who has made this make comment on how long it would last with a button cell?

Wow, Tytanium had my same questions. Didn't see that. Sorry for taking up space in your comment box for repetition. But can I use a 8 Ohm Speaker, because these are extremely common? But seriously, THANK YOU TXTCLA55!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I LOVE this Instructable. I haven't attempted to build it yet because I just found it but this is cool and simple and hopefully easy. I just am not an experienced solderer because I don't own a soldering gun so I will have to use my schools as I don't have any bread board. Ah, well. THANKS AGAIN!!!!!!!!!!!!!!!!!!!

2 replies

provided you don't exceed 200ma of current (you'll burn the ic if not).

Can this thing go to high frequencies? If not, how can I change the values of the resistors and/or capacitors to make it really high frequency? Your instructable ROCKS!!!!!!!!!!!!!!!!! I'm not kidding. Beautiful diagram. Simple too. And you use commonly available parts, no Igntion Coils or Plasma Pulse Tube Resonator Thingers in sight! Oh, and if I use a variable resistor with three prongs, which ones do I use? Can I use a photoelectric cell (aka photo resistor)?

2 replies

Woa you wrote all lot! Thanks by the way for the very nice comments. OK, for this comment. You are using photo resistors. First off yes it can do extremely high frequencies, just choose a low resistor. Secondly Well have I got news for YOU! I actually built a light theremine using them and I hope to get the ible finished writing a couple of hours so if you want you can use them in that project. as for the 3 prong variable resistors (if ya got em) just connect or test two pins. hope this helped!

actually you should always connect the 3, two of them provide full resistance and the other one is for the wiper, low resistance will always proveil but in the case of a failing whiper, your circuit won't fail, it'll just work at the maximum rated resistance for that specific variable resistor.

Great generator! I've actualy been looking for a 555/556 tone generator more along these lines. Thanks for posting.

Not to be snooty, but the capacitor's (C3) bottom side was drawn upside down. The curls should be going downward.....

Luckily, pretty much every resistor I own ends in a gold band, but some have five bands. However, for the HIGHER FREQUENCIES, what is the BEST resistance value? Thank you!

4 replies

OK, low resistance equals higher sound. Capacitors don't matter. All the caps are doing is simply controlling the current. Hope this helps.

Thank you for the help. Just one thing I don't get. HOW low should the resistors be? I feel kind of stupid, but is low resistance 100 ohms? Or is is 10K? OR it 220 ohms? Or is it 1K? I don't understand HOW LOW is low. If I use 100 Ohms, will it be inaudible to all humans, or will it just be a high-toned beep? Will it be 17 Hz so that some humans hear it and others don't??????????????? I feel like I am being annoying, but I am not good at soldering and I don't have a soldering gun (i use my schools) and I can't retake the circuit apart. Thank you!!!!!!!!!!!!!!!!!!!!!!!!!

well look at it this way... the "K" means 000 three zeros. so 10k is actually 10 000 ohms, thus a 100 ohm resistor would be lower than a 100k ohm resistor. Some place around 10 ohm and 10k ohm should be your high tone beep. As for your solder problem. try a bread board, from a store or online. this will allow you to plug in components and take them out again, no solder!

Alright, GOT IT!!!!!!!!!!! THANKS!!!!!!!!!!! YOU ROCK!!!!!!!!!!!!!!!!!!!!!

Please help me, though. I am not sure about the High Frequencies because I have never used 555 timer ICs before and I just bought two of them. If you know how to get to high frequencies, I would LOVE it if you would tell me. Thanks!!!!