This dastardly little prank will have your victim screaming (or yelling) all night. I'm not a big prankster but this one is just plain fun.

I found this in More Electronic Gadgets for the Evil Genius by Bob Iannini  It was called the Mind Mangler. Just thought I'd credit such a great guy.

Here is a video:

So, let's get started.

Step 1: Without Further Ado: The Materials

You will need:
2 555 Timers
1 100K Resistor
1 1K resistor
1 4.7K Resistor
1 100 uF Capacitor (I used 33 for an awesome result...you should get some others in the range for your favored result)
2 0.01 uF Capacitors
1 0.47 uF Capacitor
1 1uF Capacitor
1 Photocell/Photoresistor (A phototransistor will work as well)
1 9 volt Battery Clip
1 Piezo Transducer (I don't know what to say...I found mine on accident. Try a few to get a favored result.)
1 Audio Transformer( I got mine here)
A few sockets if you like to socket parts such as photocells, transducers, resistors and capacitors.
1 Perf Board/ Breadboard
nice idea, i have heard of this before, clearer steps would be good.
The schematic does not have values for the parts. If you could include what value things like R1, R2, R3, C1, and so on that would be great.
Oops. I will work on it and get back to you. Thanks.

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Bio: I love building things and taking pictures. If you want me to build something...I'm open to ideas. My motto? "If you want something ... More »
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