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Passive Piezo Buzzer
A buzzer or beeper is an audio signaling device, which may be mechanical, electromechanical, or piezoelectric. Piezoelectric buzzers, or piezo buzzers, are devided into 3 main types: passvie piezo buzzers, active piezo buzzers and self drive piezo buzzers.
Passive piezo buzzers, also known as piezo transducers, consist of a casing, a piezo element and a terminal, and you need external driving signal to operate the buzzer, therefore, with greater range of flexibility of frequencies when designing PCB circuit.
3 Terminal 22mm Self Drive Piezo Buzzer for Smoke Detector
Model:KDS-22SP-3.5 Brand:KD Dimension:22.5mm*11mm SPL:80dB min. at 12VDC
3 Terminal 85dB Self Drive Piezo Buzzer for Smoke Detector
Model:KDS-28SP-3.0 Brand:KD Dimension:28.5mm*11.5mm SPL:85dB min. at 12VDC
34.5mm Self Drive Piezo Buzzer for Smoke Detector with Wire
Model:KDS-34.5SP-3.2W50 Brand:KD Dimension:35.5mm*18.5mm SPL:100dB min. at 9VDC
3 Terminal 40mm Self Drive Piezo Buzzer for Smoke Detector
Model:KDS-40SP-3.4 Brand:KD Dimension:40mm*16mm SPL:90dB min. at 9VDC
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