sound meter

[Jason Allen Finnigan]

Network Blitz
hi can some one tell me how i could build a sound level meter that can be
hooked up to a home theater system using a led readout as well as 3 7seg led
to give me an exact numerical readout i want it to measure dB output from
the receiver on all 7 channels on separate displays

thanks
Jason

 

[Dr Engelbert Buxbaum]

Network Blitz
hi can some one tell me how i could build a sound level meter that can be
hooked up to a home theater system using a led readout as well as 3 7seg led
to give me an exact numerical readout i want it to measure dB output from
the receiver on all 7 channels on separate displays

Sound level from entertainment systems tends to fluctuate quite fast, so
the precission of a 3 figure display is pretty much wasted. All you
could measure would be signals averaged over several seconds, and the
reading would be almost meaningles.

Use an LED bar graph display instead. There are driver ICs for output in
db.