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Active Piezo Buzzer (12.2 mm)
Small ACTIVE 12.2 mm piezoelectric buzzer with a built-in oscillator/driver IC. Two leads (polarized: + / -). When DC is applied across the leads (rated 3 V, usable 3-5 V across the common 12.2 mm active-buzzer family), the part self-oscillates at its mechanical resonance (~2.7-3.5 kHz, ~85 dB SPL @ 10 cm) and emits a continuous audible tone until DC is removed. This is NOT a passive piezo element / piezo speaker — the host MCU does NOT need to generate a PWM/AC drive signal. A simple digital_write(HIGH/LOW) on the connected GPIO is enough to gate the tone on/off. Used as the local audible alarm in the AquaSense residential leak-detector design (driven from a Heltec V3 GPIO; if the chosen SKU draws more than the GPIO's strong-drive limit, an NPN transistor gate driver is implied).
Category
Actuators
Subcategory
General
Interfaces
Buzzer DC Drive
Domains
electrical, mechanical, thermal
Summary
Small ACTIVE 12.2 mm piezoelectric buzzer with a built-in oscillator/driver IC. Two leads (polarized: + / -). When DC is applied across the leads (rated 3 V, usable 3-5 V across the common 12.2 mm active-buzzer family), the part self-oscillates at its mechanical resonance (~2.7-3.5 kHz, ~85 dB SPL @ 10 cm) and emits a continuous audible tone until DC is removed. This is NOT a passive piezo element / piezo speaker — the host MCU does NOT need to generate a PWM/AC drive signal. A simple digital_write(HIGH/LOW) on the connected GPIO is enough to gate the tone on/off. Used as the local audible alarm in the AquaSense residential leak-detector design (driven from a Heltec V3 GPIO; if the chosen SKU draws more than the GPIO's strong-drive limit, an NPN transistor gate driver is implied).
Tags
Domains
electrical, mechanical, thermal
Interfaces
Buzzer DC Drive