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Cellular Phone calling Detector


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How was the value of L1 calculated?
A commercial 10mH miniature inductor, usually sold in the form of a tiny rectangular plastic box, can be used satisfactorily but with lower sensitivity. Which other value can give better sensitivity?
The circuit is monostable, can it be made astable?
Can more tha 1 LED's be connected? Smaller sized LED's but more than 1.

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