Speaker activation control by microcomputer

Details Speaker activation control by microcomputer Speaker activation control by microcomputer

1983-01-24

1987-05-26

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Ultrasonic pest control

340384E, G08B 300

Patent

active

046689370

ABSTRACT:
A microwave oven includes a piezo-electric speaker for audible announcement purposes and a microcomputer for controlling operations of the microwave oven. The mocrocomputer always develops a frequency signal for activating the piezo-electric speaker. A gate signal is developed from the microcomputer so that the gate signal and the frequency signal are commonly applied to the base electrode of a switching transistor. When the gate signal bears the logic "L", the switching transistor repeats the ON/OFF operation in response to the frequency signal applied thereto. The piezo-electric speaker is connected to the switching transistor, whereby the piezo-electric speaker generates the sound whenever the gate signal bears the logic "L".

REFERENCES:
patent: 4164735 (1979-08-01), Salem
patent: 4334280 (1982-06-01), McDonald
patent: 4349715 (1982-09-01), Mariyama
patent: 4488145 (1984-12-01), Katsuma et al.

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