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Sound level circuit

Hi experts,

I need a circuit to measure engine noise. At the moment I have a electret mic and some simple analogue filtering to give me the frequency range but I then have to do a lot of processing on the microcontroller.

I've seen LM3915 type ICs that give 10 outputs over a range of dBs, is there a simple way or other ICs that can give me better resolution.

I'm using the mic to monitor if the engine in running and need an output that gives a range of about 1000 steps resolution.

Thanks in advance

Mark.

Reply to
Medic
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10 bit ADC?
Reply to
John Fields

Maybe you want a precision rectifier, LPF and analog log circuit? It's not entirely clear to me what you are up to.

Best regards, Spehro Pefhany

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Reply to
Spehro Pefhany

Why?

1db is typically inaudible, so 100 steps would usually be just fine.
Reply to
Ian Stirling

you can buy a sound level meter at radio shack for $50

Mark

Reply to
Mark

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