In the project given here, we can
measure the value of resistance(0ohm to 10me) by hearing sharpness of the
sound. Connected the probes at the two ends of a resistances and listen to the
sound produced by the circuit. Particular values of resistances produce a
particular sound by which we can identify the approximate value of the
resistances.
PARTS LIST
IC:555
Heater Rod,small size Fan
Resistance: 100k,LDR,control 5m
Capacitor: 100MF,12V,0.001
Diodes: IN4001
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