Knock sensor question!

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i need 7 knock sensors project built them saw saw tutorial :http://www.learningaboutelectronics.com/articles/piezo-knock-sensor-circuit.php

my question why need 1 m ohm resistor?
and whats role of resistor?

"knock knock ..."

quote
my question why need 1 m ohm resistor?
absolutely not.
you can use  999,999 ohms or 1000001 ohms.



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