Active piezoelectric buzzer parameter:
| TYPE | NORS30K39P15V12 |
| Min. Sound Output at 10cm(dB) | 90 |
| Rated Voltage VDC | 12 |
| Operating Voltage VDC | 3~24 |
| Resonant Frequency(Hz) | 3900±500 |
| Max. Current Consumption(mA) | 12 |
| Tone Nature | Single |
| Operating Temperature(°C) | -30~+70 |
| Storage Temperature(°C) | -40~+85 |
| Weight(g) | 8 |
Dimension:
buzzer dimension drawingThe difference between the driving circuit of an active buzzer and a passive buzzer is mainly that the passive buzzer is essentially an inductive element, and its current cannot be transient, so there must be a freewheeling diode D1 to provide freewheeling.
Otherwise, there will be a back-induced electromotive force at both ends of the buzzer, resulting in a spike voltage of tens of volts, which may damage the driving transistor and interfere with other parts of the entire circuit system.
If the working voltage in the circuit is large, a diode with a larger withstand voltage value should be used, and if the working frequency of the circuit is high, a high-speed diode should be used.
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