Radio Shack meter schematic
Try this link:
http://cygnus.ipal.org/mirror/www.people.Virginia.EDU/~edw3g/rs_spla.gif
If you build this there are also several sites that talk about how to make it accurate or better. A decent microphone will cost about as much as the commercial meter plus you need a calibrated source to get it all correct.
Good Luck
Try this link:
http://cygnus.ipal.org/mirror/www.people.Virginia.EDU/~edw3g/rs_spla.gif
If you build this there are also several sites that talk about how to make it accurate or better. A decent microphone will cost about as much as the commercial meter plus you need a calibrated source to get it all correct.
Good Luck
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