Fox 40 Electronic Whistle -DS

Product Information

Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed. Because there are fewer passive devices used, the electric whistle of the present invention is compact and the manufacturing cost is relatively low. The sound IC 30 has a power pin VDD, two oscillation frequency set pins (X)(Y), multiple selection pins K 1-K 4, an audio output pin BZ, a database 31 and an oscillation unit 32.

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However, passive devices, such as the capacitor C 1 and the resistors R 2 which are necessary for determining the oscillation frequency of the oscillation signal, certainly increase the bulk of the conventional electric whistle. The oscillation frequency of the audio control signal is determined by the single tone-set resistor without a capacitor. Then the second coil Lb senses the magnetic field to produce an induction voltage to activate the buzzer 50. When the electric switch Q 1 is turned ON, the mobile power pack 11, the first coil La of the inductor L and the electric switch Q 1 form a current loop and a current flows through the first coil La.Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list. The sound level of the buzzer 20 is directly proportional to the voltage across the second pin L 22 and the common pin L 33. The audio control signal comprises multiple high potentials and multiple low potentials changed alternately.

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The inductor L has a first coil La, a second coil Lb, a first pin L 11, a second pin L 22 and a common pin L 33. When the electric switch Q 1 receives the audio control signal, the electric switch Q 1 is turned ON at the high potentials and is turned OFF at the low potentials. The first coil La is then activated to induce the second coil Lb for producing the induction voltage corresponding to the audio control signal. We are a premier online security products industry directory that delivers the most comprehensive guide to the latest in security products. We provide you with the absolute best protection and ongoing support in the security industry today.

In comparison to the conventional electric whistle, the oscillation frequency of the audio control signal in accordance with the present invention is simply determined by the tone-set resistor R 1 without a capacitor. When the transistor Q 1 is turned ON, a current flows through the first coil La and the first coil La induces a magnetic field. Compared with the conventional electric whistle, the electric whistle of the present invention has fewer passive devices. According to the selected audio control signal sent from the audio output pin BZ, the electric switch Q 1 is turned ON and OFF alternatively.

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The control IC 40 generates an oscillation signal and sends the oscillation signal to the transistor Q 1 via the first pin to activate the transistor Q 1.The use of those passive devices means that the bulk of the conventional electric whistle cannot be reduced, thus rendering the electric whistle inconvenient being taken around by the user. Download PDF Info Publication number US8760272B2 US8760272B2 US13/551,759 US201213551759A US8760272B2 US 8760272 B2 US8760272 B2 US 8760272B2 US 201213551759 A US201213551759 A US 201213551759A US 8760272 B2 US8760272 B2 US 8760272B2 Authority US United States Prior art keywords pin electric whistle control terminal electric whistle Prior art date 2012-07-18 Legal status (The legal status is an assumption and is not a legal conclusion.

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The oscillation frequency of the oscillation signal is determined by the capacitor C 1 and the resistors R 2, R 3. If the above Electric Whistle doesn't cover what you need, feel free to browse our catology for other products Ideas that provide modern, innovative defenses.

Then the second coil Lb senses the magnetic field and generates an induction voltage to activate the buzzer 20. and 2, a first embodiment of the present invention comprises a power circuit 10, an inductor L, an electric switch Q 1, a buzzer 20, a tone-set resistor R 1 and a sound IC 30. Original Assignee Individual Priority date (The priority date is an assumption and is not a legal conclusion.