
MAKE:
READERS BECOME
MAKE:
AUTHORS!
UNDERSTANDING A CIRCUIT
“Pitch Perfect” (Make: Volume 85, page 52) is
exactly my kind of project, using a few simple
parts in a creative way, with no microcontroller in
sight. I got quite excited as I started reading it. But
I can’t understand how the circuit works. Maybe
more diagrams would be helpful. I desperately
needed a schematic, and/or a flow diagram, so I
could visualize what’s happening. —Charles Platt,
author of Electronics Fun & Fundamentals column
Author Kirk Pearson replies:
Here’s a schematic of The Undertoner circuit (see
full size at makezine.com/go/undertoner) that we
prepared for our upc