Passive buzzer on ESP32

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01:22:56

The passive buzzer is represented by a light bulb. It runs on 5 V, while the ESP32 pin drives the base of the transistor with 3.3 V. The base resistor protects the GPIO pin from a short circuit and limits the base current. The series resistor before the buzzer limits the current through the transistor and also affects the buzzer’s volume. A flyback diode must be placed in reverse polarity across the buzzer to suppress inductive voltage spikes.

published 2 months ago

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