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Call the exterminators

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ReneCardenas
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re: Call the exterminators
ReneCardenas   7/14/2011 8:01:20 PM
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Michael, Thanks for the idea, I might have some laughs at the DMV office next time.

David Ashton
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re: Call the exterminators
David Ashton   7/14/2011 10:18:47 PM
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Someone gave me one of these devices recently. It has a photocell that cuts it off when light falls on it, which makes it almost impossible to find. It's somewhere near my workbench - when I find it I'll try and post the schematic.

HTSI Hitzeman
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re: Call the exterminators
HTSI Hitzeman   7/15/2011 7:01:47 PM
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I built a similar device when I was in the Navy back in 1969. It was an electronic drip noise maker. I put it in the electronics shop on top of a light fixture. It drove people nuts but it didn't bother me a bit, I knew what it was.

Polyspace
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re: Call the exterminators
Polyspace   7/15/2011 8:04:12 PM
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You wouldn't happen to remember the Title/Author of that book, would you? ;-) I would love to show my son the self-igniting airplanes!

john_#3
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re: Call the exterminators
john_#3   7/15/2011 10:34:26 PM
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I had a great time with "drip" circuits! An article I posted about them to sci.electronics in 1988: http://groups.google.com/group/sci.electronics/msg/d71d22473f28ecba?&dmode=source The magazine I mention was in fact Popular Electronics. I used one of these as retribution against my brother once when he annoyed me. He had a bunkbed with verticals made of large-diameter tubing, with 1/2" holes along the length to attach the bedframes at different heights. I made one of these circuits with cells smaller than 9V batteries so it would fit through one of the holes, and dropped in it. There was no getting it out even after he found it...

CECR
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re: Call the exterminators
CECR   7/15/2011 10:39:28 PM
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In high school we had a pager / pa system that wold make an annoying beep to which the teacher of the room being beeped would always respond yes or what ever. Each room had a box with two circular opening containing a clock and the speaker for the pager / pa system. I noticed that the beep sounded almost exactly like a 9V buzzer I had at home. I took an LMC555 and wired it for a long delay short duty cycle output so the buzzer sounded like a page about every 5 minutes. My math teacher was a real moron and the inspiration for the prank. Drove guy nuts. Every time he tried to communicate with the buzzer for the entire class. After class I was hanging around waiting for an opportunity to retrieve the device and was busted by the next teacher. He knew me and after hearing the first beep figured out I was probably behind it. He got up on a chair after the math teacher left and retrieved the device. He said I know this is yours and if I find another one in this school you again you will be in big trouble. He knew I hated the math teacher and he did not particularly like him ether. He gave me back the device. I used the same buzzer in collage on a control systems professor who would always pace back and forth in the front of the classroom and two or three times each class he would catch the pencil sharpener knocking off shaving holder. By the end of the second class I decided he cold probably be trained. So I took a mercury switch the buzzer and 2 batteries to make it really loud. Hi missed it on the firs pass, second pass, the anticipation is killing me. 4th pass he hits it and it makes a racket so loud that he jumps, looses his glasses, drops his chalk and fumbles several times while he straightens the shaving holder causing a few more small beeps. He never hit the shaving holder again. I did not retrieve that system until after dinner.

JDWexler
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re: Call the exterminators
JDWexler   7/18/2011 5:59:54 PM
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A friend of mine hid a noisemaker to annoy management but it was trickier than most, two ways: 1)it only made noise when stimulated by certain outside sounds and 2)it was buried in a piece of office furniture, with only a small aperture for sound to exit. It ran for about 2-1/2 months before someone figured out how to find it and managed to locate it. The lithium coin cell was still pretty healthy, probably because it only made noise when triggered by outside sounds.

ffr2822
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re: Call the exterminators
ffr2822   8/4/2011 7:20:03 PM
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alas no. But I do remember the method - and it's doubtful you can get the materials the way things are these days. Pretty simple - dissolve phosphorus in carbon tetrachloride. when the CCl4 evaporates, it leaves the phosphorus behind. *poof*

sharps_eng
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re: Call the exterminators
sharps_eng   12/13/2011 8:40:20 AM
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The exhuberance of youth, eh! I hope you guys progressed to making stuff that spread a little happiness instead of grief? I know I did.

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