Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1974-05-15
1978-02-21
Pitts, Harold I.
Communications: electrical
Audible indication
Ultrasonic pest control
340384R, G08B 300
Patent
active
040756246
ABSTRACT:
An electronic siren including yelp and wail oscillators, means for mixing the signals from the yelp and wail oscillators, and an amplifier output circuit for broadcasting the mixed yelp and wail signals. The wail oscillator is adapted to operate automatically or may be operated manually by means of a push button or from remote switching means. The wail oscillator may also be switched to operate with a siren sound or a horn sound having a variable pitch. The amplifier output circuit is also utilized as an output circuit for a variable volume microphone or radio input signal thereto. Additional amplifier structure for increasing the output of the electronic siren is also provided in accordance with the invention.
In operation, the electronic siren will provide a microphone or radio output, a manually selected automatic siren or horn sound output from the wail oscillator, the output of both the wail and yelp oscillators simultaneously, or the output of the yelp oscillator. The manually selected horn or siren sound output of the wail oscillator may also be initiated manually and under control of a remote switch. Optionally, the yelp oscillator may be remotely operated also.
REFERENCES:
patent: 2910688 (1959-10-01), Kelley
patent: 3378773 (1968-04-01), Jeffers
patent: 3718987 (1973-03-01), Carver
patent: 3747092 (1973-07-01), Smith
patent: 3810169 (1974-05-01), Locke
patent: 3868684 (1975-02-01), Nunn
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