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- - Variable-pitched frequency generator -
- - or -
- - How to annoy your techers! -
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- - Written By -
- - -
- - ::: Captain Quieg ::: -
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- - -
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- In the fast paced world of education one often finds oneself with a burning
- hatred towards one or more teachers or fellow students. This article will
- describe how to build a little device that will emit a very high freqency that
- is -extrememly- annoying to most people and it will wreck concentration and can
- cause some nasty headaches.
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- Parts needed:
-
- R1: 100k ohm Trimmer potentiometer
- R2: 47k ohm resistor (5% tolerance)
- C1: 4.7 uF Polarized electrolytic capacitor
- C2: small disc capacitor (.001 uF or less)
- SP: 8 ohm speaker. Piezo buzzers work best but you can use most any speaker
- for this job.
- IC: 555 timer Integrated Circut.. Availible at Radio shack or any decent
- electronics store
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- Let's start with a schematic of the device..
-
- ! V+ (9 volts)
- ! R1 :
- V :
- ^^^^^-----------------
- : :8 :4
- : !------------------!
- : 7! !3
- :------! !-------------
- : ! ! :
- : ! IC ! --- /!
- \ ! ! ! !/ !
- /R2 ! (555) ! SPKR ! ! !
- \47k 6! ! ! ! !
- / ---! ! ! ! !
- : ! ! ! ! !\ !
- : ! 2! ! --- \!
- :------! ! :
- : !------------------! + :
- : :1 C1 ---
- : : ---
- : :----- V- (9 volts) - :
- : : :
- : : :
- : ! !C2 : :
- :-----! !-------------------------------
- ! !.001uF :
- -----
- ---
- - GND
-
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-
- Okay
- Now that we have the schematic out of the way we can discuss construction..
- It's best to use an 8-pin socket for soldering before you put the IC in.. You
- can put it on a small PC board or perfboard.. Use R1 (the potentiometer) to
- adjust the frequency from a high whistle to an instant migrane. If you find
- that the freqency is not as high as desired use a smaller capacitor for C2.
- The Idea here is to bring the frequency just below the highest frequency that
- can be perceived by the human ear. You will definetly know when you have
- acheived this! Once finished mount it in a project case with an on/off switch
- and you're ready.
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- Use
- ---
-
- One particularly nice thing about this device is that if you set it to a high
- enough frequency it is almost impossible to locate once hidden.. So once
- you've found a suitible location put it anywhere were it can't easily be seen
- and turn it on.. Guaranteed results! .. One little problem with this thing
- is that some teachers don't seem to hear it (generally older teachers).. but
- anyone with a good set of ears will be driven crazy by it!! Including you if
- you place it in a room that you are planning to be in for any length of time..
- So DONT. If you have any questions about this thing I'll be happy to answer
- inquiries.. Have fun!
-
- ::: Captain Quieg :::
-
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