Piezoelectric electronic audible alarms work by converting the user input voltage to an appropriate oscillating signal that is applied to a sounder element that is mounted in a housing. This piezoelectric sounder element consists of a metal disc that has a special ceramic material bonded to it that physically bends when voltage is applied to it.
|Operating Voltage||30Vpp Max.|
|Resonant Frequency||750 ±250Hz|
|Capacitance||70nF ±30% @ 120Hz|
|Current Consumption||1.5mA Max. @ 5V⎓|
|Sound Pressure Level||Min. 87dB @ 5V⎓, 10cm|
|Dimensions||14 × 60mm (44mm Wide w/o Mounting Ears)|
|Mounting Centers||52mm (Hole Diameter 3.5mm)|
|Wire Gauge||28 AWG|
|Operating Temperature||-20° to 70°C (-4° to 158°F)|
Direct drive transducer devices do not have any included DC circuitry, so the user must apply a sine or square wave with the appropriate rated frequency. A square wave will typically result in more sound level than a sine wave. The higher the peak-to-peak voltage applied (up to the maximum rated voltage), the higher the resulting sound level.