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Self Drive Piezo Buzzer
Self-drive piezo buzzer has three terminals, for which the piezo effect works both ways: if you apply a voltage the piezo element stretches, and if it stretches it creates a voltage. This principle is used to create a feedback signal which drives the oscillator.
The advantage of the self-drive piezo buzzer is that the piezoelectric diaphragm inside has a feedback electrode, it will auto-magically work at its resonance frequency, where it produces the loudest sound. Self-drive piezo buzzers are mostly utilized in various alarms such as smoke alarms and access control, etc.
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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