99 lines
3.6 KiB
Plaintext
99 lines
3.6 KiB
Plaintext
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-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-
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- -
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- Variable-pitched frequency generator -
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- or -
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- How to annoy your techers! -
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- -
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- Written By -
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- ::: Captain Quieg ::: -
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- -
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- -
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In the fast paced world of education one often finds oneself with a burning
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hatred towards one or more teachers or fellow students. This article will
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describe how to build a little device that will emit a very high freqency that
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is -extrememly- annoying to most people and it will wreck concentration and can
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cause some nasty headaches.
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-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-
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Parts needed:
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R1: 100k ohm Trimmer potentiometer
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R2: 47k ohm resistor (5% tolerance)
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C1: 4.7 uF Polarized electrolytic capacitor
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C2: small disc capacitor (.001 uF or less)
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SP: 8 ohm speaker. Piezo buzzers work best but you can use most any speaker
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for this job.
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IC: 555 timer Integrated Circut.. Availible at Radio shack or any decent
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electronics store
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-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-
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Let's start with a schematic of the device..
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! V+ (9 volts)
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! R1 :
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V :
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^^^^^-----------------
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: :8 :4
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: !------------------!
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: 7! !3
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:------! !-------------
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: ! ! :
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: ! IC ! --- /!
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\ ! ! ! !/ !
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/R2 ! (555) ! SPKR ! ! !
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\47k 6! ! ! ! !
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/ ---! ! ! ! !
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: ! ! ! ! !\ !
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: ! 2! ! --- \!
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:------! ! :
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: !------------------! + :
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: :1 C1 ---
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: : ---
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: :----- V- (9 volts) - :
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: : :
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: : :
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: ! !C2 : :
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:-----! !-------------------------------
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! !.001uF :
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-----
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---
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- GND
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-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-
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Okay
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Now that we have the schematic out of the way we can discuss construction..
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It's best to use an 8-pin socket for soldering before you put the IC in.. You
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can put it on a small PC board or perfboard.. Use R1 (the potentiometer) to
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adjust the frequency from a high whistle to an instant migrane. If you find
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that the freqency is not as high as desired use a smaller capacitor for C2.
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The Idea here is to bring the frequency just below the highest frequency that
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can be perceived by the human ear. You will definetly know when you have
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acheived this! Once finished mount it in a project case with an on/off switch
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and you're ready.
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-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-
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Use
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---
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One particularly nice thing about this device is that if you set it to a high
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enough frequency it is almost impossible to locate once hidden.. So once
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you've found a suitible location put it anywhere were it can't easily be seen
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and turn it on.. Guaranteed results! .. One little problem with this thing
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is that some teachers don't seem to hear it (generally older teachers).. but
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anyone with a good set of ears will be driven crazy by it!! Including you if
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you place it in a room that you are planning to be in for any length of time..
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So DONT. If you have any questions about this thing I'll be happy to answer
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inquiries.. Have fun!
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::: Captain Quieg :::
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-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-[]-
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Call The Works BBS - 1600+ Textfiles! - [914]/238-8195 - 300/1200 - Always Open
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