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Shake Flash Light using Faraday's law

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khaliil

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Hi there.
I'm doing Shake Flashlight which uses the principle of Faraday's Law (magnetic induction). My question is: How can i add a voltage sensor which can measure the voltage of the capacitor and than resets the resistor automatically which is connected 2V LED.
below is the circuit diagram...
i have done research about the voltage sensor but i couldnot find anything that is useful...i need to implement this VOLTAGE SENSOR...
i would real appreciate your help the sooner the better:cool:....
 
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