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.
Add a Teacher Note to share how you incorporated it into your lesson.
Step 1: Without Further Ado: the Materials
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
Step 2: The Build.
Once all your parts are collected, build the circuit according to the schematic. I only have a few pictures of my build because you should come up with your own creative design. Post your pictures in the comments. If time permits, I will design a circuit board for you guys.
Step 3: And Now...You're Done.
It should give them quite a rough night although it won't be TOO long until they find it...I think...