Sound level meter

zafranax

what ICs can u suggest to be used in my sound level meter for outdoor speakers in order to have an accurate measurements. power amplifier to be used will be 50, 70, 100 watts power out put.

vk6kro

Analog make a wonderful logarithmic amplifier chip, the AD8307 which would be great.

But, seriously, go and buy a sound level meter. They are cheap and come already calibrated and in a nice case with a guarantee.

This is an example:
http://www.frys.com/product/2965325?...H:MAIN_RSLT_PG
You can get better ones, too, but this one looks fine for general use.

f95toli

Even if you build you still still have to calibrate it, which can only be done using another sound level meter....

Calibrating sound level meters is actually quite tricky. Even commercial ones are often quite limited and only really useful for "noise", they are often very inaccurate at e.g. low frequencies (the one I have at home is useless below about 100 Hz).