Buzzer with electronic integrated oscillation circuit

摘要

A buzzer comprises a vibration unit, an electromagnet transducer for applying an electromagnetic excitation to the unit, and an electronic oscillation circuit for driving the transducer. The oscillation circuit includes a group of electrical components which constitute a blocking oscillator together with the coil assembly of the transducer and which are contained on a bipolar integrated circuit module. The module is mounted on the coil bobbin of the transducer.