Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1978-01-23
1979-07-31
Pitts, Harold I.
Communications: electrical
Audible indication
Ultrasonic pest control
340388, 340384E, G08B 300
Patent
active
041632230
ABSTRACT:
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.
REFERENCES:
patent: 3950744 (1976-04-01), Stephens
Harakawa Mototaka
Mitumori Yoshio
Sato Yukio
Pitts Harold I.
Star Seimitsu Kabushiki Kaisha
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