Frequency Meter Circuit

This
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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Sensitive Audio Power Meter

As a follow-up to the simple audio power meter described in [1], the author has developed a more sensitive version. In practice, you rarely use more than 1 watt of audio power in a normal living-room environment. The only time most people use more is at a party when they want to show how loud their stereo system is, in which case peaks of more than 10 W are not uncommon.

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