![]() ![]() The above picture shows a bare piezoelectric sounder element. ![]() The piezoelectric sounder element consists of a metal disc that has a special ceramic materialīonded to it that physically bends when voltage is applied to it. 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. Operation of Piezoelectric Audible Alarms If you need to wash the alarms after a soldering operation, it is strongly recommended to use an alarm that comes with a wash label that keeps the washing fluid from getting inside of the front cavity. ![]() However, fluid sitting inside the front cavity can obstruct the operation of the device causing the sound level to decrease significantly. If the back of the alarm is sealed with epoxy or other material, the “guts” of the alarm (including the circuit board and components) are protected against fluid intrusion. The above picture can be interpreted to represent a board mount package with pc pin terminations, but the same concept is used when building audible alarms in other mounting configurations such as SMT, Flange Mount, and Panel Mount alarms. If the alarm is an indicator that contains a circuit board, the circuit board is attached to the piezoelectric sounder element via soldered wires. The area in front of the transducer element including the front hole opening forms an acoustic cavity that lets the sound radiate out with the most efficiency (i.e.
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