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We made a Mind Mangler out of a 555 timer chip, this creates a very high pitch humming sound that makes it very difficult to find and detect. It annoys the living life out of our victims a.k.a roomates. Visit our website at www.hm-innovations.com for additional projects.
Much more fun with a pot at R3 for amplitude control and a 10k pot at R2 for frequency control...you can produce a truly annoying sound by playing with these two pots!
this would be a lot more annoying, if it only makes sound in the dark. <br>LDR + traNsistor perhaps` <br>
I like this circuit, but I wanted to a feature to it. <a href="https://www.instructables.com/id/555-Timer-Variable-Loud-Buzzer-Based-on-the-555-M/" rel="nofollow">https://www.instructables.com/id/555-Timer-Variable-Loud-Buzzer-Based-on-the-555-M/</a>
I built it with a .22uf capacitor and the buzzing was a higher pitch. I also tried the 1uf cap but I liked it better with the .22uf cap.
I also took out R3 and it was incredibly much more louder! Next I will try a potentiometer there.
Will this also work on 5V? and 3V?
I have to agree with the ads, i got as far as the 3rd page, lost interest and shut the window down!
I checked out your site. It would be really cool if it didn't have ads all over. Every time you click on something you get some sort of ad. Very annoying!<br /> <br /> Projects are cool though.<br />

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Bio: We are a group of Engineers, Tinkerers, Designers, Programers, and Nerds ! ---- and Since April 2011 We also have a Cupcake Maker
More by HM-Innovations:Cupcake PushPops Super Mario Mushroom Cupcakes How to make Decorative Cupcakes 
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