is the circuit of frequency meter. It measures the frequency of the
input signal in terms of current passing through an ordinary ammeter.
The main component of this circuit is the 555, a versatile,
general-purpose timer IC. In this circuit, the 555 is configured as a
monostable multivibrator that outputs a single pulse at pin 3 every time
the input signal at pin 2 goes low.The
width
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