Long lasting terrible tone generator

169

02:37:17

Creates an approx 10khz tone in short pulses to save the battery and provide long lasting pranking fun at the expense of someone you dont like very much. Resistor and series inductor are the speaker. Inductance of the speaker is a total guess so you just have to experiment with different parallel cap values to get the tone you want.

published 12 years ago

faceblast

12 years ago

hah, I like this

thebugger

12 years ago

The inductor is useless. I mean there is a simpler way to get 14khZ with lets say phase shift oscillator. I just really dont like inductors.

hurz

12 years ago

But with some changes it suppose to make drum sounds like a machine gun. Reminds me to build some tomtom, and snare sound circuits ;-)

atlaswalkedaway

12 years ago

The inductor was just to simulate the fact that a speakers driving element is in fact an inductor. How exactly can you get acurate results in simulating a speaker if you dont include its inductive properties and instead view it as a non dynamic linear system?

hurz

12 years ago

2mH is far to big i think. Just calculate 20kHz x 2mH x 6.28 and you get a inductuive blind resistor of about 250Ohm which is much to high. So a real loudspeaker must have a much lower inductivity to make current to sound which can only happen at a pure resistive value were current is transformed into mechanical energie and some heat.

atlaswalkedaway

12 years ago

While i agree that 2mh is an outrageous value, Its my understanding that any inductive load can never have a pure resistive value when subjected to ac and that generally speaking, its relative resistive value is largely dependant upon the frequency. I could, of couse be spouting outdated knowledge as I was only trained in troubleshooting and it was on the vietnam era communications equiptment we used. Full twent pace scematics that you wont find a single mosfet on. Lol

hurz

12 years ago

Btw, an inductor is a linear component

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