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Reply With QuoteWell, if it is at 30KHz, then no one will hear it. Human hearing tops out at around 22KHz. However, all the dogs in the neighborhood would know someone was taking your player...
Simple but effective alarm??
How about mounting one of these in the MP3 case, so when something from the back of the player is unplugged, the siren goes off?? You could have a small battery in the player to power it... No-one is going to run off with a screeching box under one arm, are they??
It runs off 6-12volts at 250ma, and is rated at 108dB @ 1m, 3000Hz
[ 08-30-2001: Message edited by: SkinnyBoy ]
Well, if it is at 30KHz, then no one will hear it. Human hearing tops out at around 22KHz. However, all the dogs in the neighborhood would know someone was taking your player...
Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
"If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."
I think it's 3000hz and at that level, it's one hell of an anoying sound...
Raas - The Netherlands
ME: VIA epia m10000, lilliput 7', opus 150w, 80gb<br>
GF: IBM Thinkpad 380, ext. 3.5 80gb, 40x4, PB-IR
Well, SkinnyBoy,
I think that was a good idea!
I figure if everyboddy is going to rant about your posts then someone should also compliment you when you post something good!
(Sorry for the *off-topicness* of my post)
1983 BMW 733i
Cyrix 166 32MB with MPXPLAY And no display. Player sits on the back seat with a keypad in front. Someday I'll mount this thing for good...
*****************************
Gathering parts for carplayer v2.0!
TYPO...
corrected...
is 3000Hz lowish?
good idea ..
(my car just got broken into the other day ..)
how would you trigger it? and how would you keep it from going off if you where to take out your computer?
perhaps have it triggered if the power supply is disconected and have a key to arm / disarm it?
[SIZE=1]'91 Nissan Stanza
[XXXXXXXXXXXXXXXXXXXX] XX% Completed -
Car Totaled and i bought a 20G mp3 player
http://machs-fuel.tk
a DIY video projector page
key to arm/disarm, and triggerd when you unplug something, anything...
my friends car got robbed of his computer and the jackass who did it didnt unplug the Cables he/she cut them.
Even if the cables were cut or snapped, it would still go off because the circuit would be broken...
No, it's almost the same tone we speak at, maybe a bit higher..is 3000Hz lowish?
But it's really loud as as the sound-volume Doubles with each 3dB..
(and so to say that a sound-volume is almost 10x as hard when it increase by 10db)
I think it's a good idea, but you may want to take a siren that is a little more louder.. (say like 115db or maybe even 120db.. distance 1m)
This way they really can't take it under their arms because it hurts their ears) (but at this frequency. it's a really anoying noise)
I think with 108dB you're still able to take it and run away.. Face it.. How many people react to a car alarm these days...
Just make it so loud that they really can't run away with it...
Greetz..
Raas - The Netherlands
ME: VIA epia m10000, lilliput 7', opus 150w, 80gb<br>
GF: IBM Thinkpad 380, ext. 3.5 80gb, 40x4, PB-IR
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