The Big Brained Superheroes Club has issued a challenge to build a noise meter, and so I thought I would give it a try. Hence I looked up a web page at the arduino site for building a noise meter. Note the schematic on the page, which I tried to implement here:

As you can see from the checklist and the circuit itself, I’m about halfway finished and need to connect to the Arduino board, load in the sketch from the web page, and away we go.

— One tiny little problem, though. The aforementioned circuit diagram uses an LMV324 op amp, and the only one I could get on short notice was an NTE823. So I may have to tweak things a bit. That won’t break anything, will it?