Sound level circuit

Jan 25, 2006 4 Replies
M

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.



Vote
Twitter Facebook LinkedIn
S

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

"it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Vote
Twitter Facebook LinkedIn
I

Why?

1db is typically inaudible, so 100 steps would usually be just fine.
Vote
Twitter Facebook LinkedIn
M

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

Mark

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required