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Step 3Circuit Chunks
Hall Effect Sensor - A sensor that changes it's output voltage when it sees and changing magnetic field. They used to be expensive and complicated, but now they are simple and cheap.
VCO - Voltage Controlled Oscillator. A circuit that oscillates (makes a tone) at some pitch. The pitch changes when you feed it a changing voltage from the sensor.
Piezo Speaker - Changes the electric signal from the VCO to an annoying audible tone.
Battery, Regulator, and Switch - 9V battery power is reduced to 5V by the regulator because this hall sensor doesn't want to see more than 6V power. Pushbutton switch switches power like switches do.
VCO - Voltage Controlled Oscillator. A circuit that oscillates (makes a tone) at some pitch. The pitch changes when you feed it a changing voltage from the sensor.
Piezo Speaker - Changes the electric signal from the VCO to an annoying audible tone.
Battery, Regulator, and Switch - 9V battery power is reduced to 5V by the regulator because this hall sensor doesn't want to see more than 6V power. Pushbutton switch switches power like switches do.
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