I deassembled a digital wall clock to see a temperature sensor. I saw little unusual another thing there. There was a piezo transducer plate as beeper. Exactly on the plate there was a 5mm thick inductor was added in parallel (I don't know its inductance).
What is the purpose of the inductor there? Maybe that is high value inductor otherwise audio signal would be attenuated. Seems unusual to me. Google shows same thing I found today inside the clock: http://www.mbedded.ninja/wp-content...isc/piezo-drive-circuit-parallel-inductor.jpg
What is the purpose of the inductor there? Maybe that is high value inductor otherwise audio signal would be attenuated. Seems unusual to me. Google shows same thing I found today inside the clock: http://www.mbedded.ninja/wp-content...isc/piezo-drive-circuit-parallel-inductor.jpg