
the next, merrily up and down, relating to one
another in a mysteriously harmonious way. Your
circuit is playing not just any pitches but musical
notes!
How mysterious indeed! What could be
animating such a device? Well, we’ll tell you...
Right after these hot tips!
VARIATION 1: THE ATARI PUNK CANDLE
If you’re the experimental type, now would be a
good time to swap out pot 3 for an LDR, aka light-
dependent resistor. This way, you can control
the transitions between notes with changing
light intensity! Grab a candle, enter a dark room,
and see if you can find the sweet spot where
the candle’s flickering makes your Undertoner
arpeggiate like a