how do you build a decibel meter?

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Whatr kind of range ? A VU meter is a "decibel meter".

cuteblondchick (author)  steveastrouk6 years ago
what is a VU meter
Google and Wikipedia can both tell you. They can also tell you how you could build a sound-level meter (as Jack has already pointed out).

It would be useful, as Steve has noted, for you to state the problem you are trying to solve, rather than asking how to build what might or might not be the correct solution to that problem.
cuteblondchick (author)  cuteblondchick6 years ago
the buzzer i am using is a 75dB Piezo Electric Buzzer for a science project.
Tell you what. What question are you trying to answer ?

cuteblondchick (author)  steveastrouk6 years ago
i was replying to the range.
So you want to measure 75 dB. What range ? +/- 10dB ? 20 ?
I am guessing you want to measure the intensity of sound, in air, and that you want to build some apparatus to do this.  Another guess is that the usual way this is done is by way of a transducer (e.g. electret microphone), followed by an amplifier, followed by some sort of power measuring circuit.  The following search might return something you can use.