System for controlling an electronic warning device

Details System for controlling an electronic warning device System for controlling an electronic warning device

1978-12-18

1980-11-04

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 310

Patent

active

042323053

ABSTRACT:
The invention relates to electronic warning devices. The control system includes means for supplying an accurate clock signal and a divider (CD1, CD2) for dividing the clock signal to obtain an audio frequency, adjusting the mark/space ratio of the audio frequency for application to a power transistor (T6), said transistor driving a loudspeaker (HP), providing a cyclic modulation for modulating the clock frequency; and timing the duration of the sound emission of the loud speaker. The timing functions can all be provided without the use of electrolytic capacitors as would otherwise have been necessary, thereby avoiding problems due to the lack of precision and drift in the values of such capacitors.

REFERENCES:
patent: 4090349 (1978-05-01), Takasie
patent: 4094140 (1978-06-01), Ohue
patent: 4100543 (1978-07-01), Stockdale
patent: 4147021 (1979-04-01), Kondo

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