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[[Image:Urban-cricket-schematic-simply.gif|thumb|Sechematic]]<br>
[[Image:Urban-cricket-schematic-simply.gif|thumb|Sechematic]]<br>
= Schematic description =
= Schematic description =
The Urban Cricket consists of three simple oscillators, a piezo beeper with built in driver and a solar cell for powering the circuit. The piezo beeper has a built in driver which means that a voltage applied will cause the beeper to generate noise not only a short click. It generates a tone at about 2,000 to 3,000 Hertz witch sounds pretty annoying ("piiiiiiiiiiiii").<br>
The Urban Cricket consists of three simple oscillators, a piezo beeper with built in driver and a solar cell for powering the circuit. The piezo beeper has a built in driver which means that a voltage applied will cause the beeper to generate noise not only a short click. It generates a tone at about 2,000 to 3,000 Hertz witch sounds pretty annoying (''"piiiiiiiiiiiii"'').<br>
The first oscillator makes the beeper beep at a variable frequency of about 20-100 Hertz. The beeper controlled by the first oscillator sounds short 2-3khz bursts.<br>
The first oscillator makes the beeper beep at a variable frequency of about 20-100 Hertz. The beeper controlled by the first oscillator sounds short 2-3khz bursts (''"brrrrrrrrrrrrrrrrr"'')<br>
The second oscillator works much slower at about 1 to 3 Hertz. The functionality of the second oscillator is to stop the first one at some times. Now the cricket sounds "brrr brrr brrr brrr brrr brrr".<br>
The second oscillator works much slower at about 1 to 3 Hertz. The functionality of the second oscillator is to stop the first one at some times. Now the cricket sounds ''"brrr brrr brrr brrr brrr brrr"''.<br>
The third oscillator runs even slower than the second one causing the second one to stop at some times. Now the cricket sounds "brrr brrr brrr <pause> brrr brrr brrr <pause>" and so on.<br>
The third oscillator runs even slower than the second one causing the second one to stop at some times. Now the cricket sounds ''"brrr brrr brrr <pause> brrr brrr brrr <pause>"'' and so on.<br>
The the oscillator stages a coupled via diodes to make them influence the other only one way. All six not-gates a located on one ic-chip (74HC04 or 74HC14).<br>
The the oscillator stages a coupled via diodes to make them influence the other only one way. All six not-gates a located on one ic-chip (74HC04 or 74HC14).<br>
= Values =
= Values =