[Atlplasma]

A friend, Steve Lafferty, has just completed a detailed article on how to construct a seriously good Audio Level Meter. Steve is an excellent engineer and life-long audio enthusiasts.

If you'd like to read his how-to article, go to http://www.tronola.com/ and click on the Audio Level Meter link. Even if you're not interested in building the ALM, the article is worth reading as an excellent example of technical writing.

[mgalusha]

Very nice. That would be a handy gadget to have, might have to add that to the someday project list.

[Speedskater]

I thought that this was about a cal mic and an SPL meter, but it's not!  It's like a VU meter connected to the output of your amplifier.
Steve also has a neat sine wave tone generator.