Measuring sound pressure level

[Bubba]

Greetings to all,

I was thinking about building low-cost analog sound level meter, however, 
i am not sure how to get the non electrical value of sound pressure and 
transform it in electrical value. I planned to display the level with 
(cascaded) LM3915s', but was wandering about ideas of how to obtain sound 
pressure level in the first place.

Thanks in advance!


-- 
Kupio sam pistolj od svercera na crno,
Na tebe cu rado da potrosim zrno...