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Important: Turn the power “OFF” immediately if the circuit does not
work. Leaving power on could damage or overheat the battery or Micro.
When you’re ready, turn the power “ON”. What happens? You’ll know your circuit is
working when the you hear a tone! This means that power and speakers work.
If nothing happens, don’t worry! Just turn the power “OFF” and check for mistakes,
a process called troubleshooting. With a bit of looking you’ll find what to fix.
Let’s think about what’s going on. Right now, I’m connected to a
speaker, a battery, and a capacitor. The battery gives me power, and
the capacitor stores extra energy for when I need it most.
With this power, I create an electrical signal that I send to the speaker. When the
signal changes, the magnet inside the speaker moves. This creates sound that you can
hear. I’m only playing a single note now, so let’s add parts to build a real theremin!
Power
Signal
131 Hz
5V
