Fox 40 Electronic Whistle -DS

Product Information

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. The tone-set resistor R 1 is used to determine the oscillation frequency of the audio control signal to time the tone of the whistle ringing. We are a premier online security products industry directory that delivers the most comprehensive guide to the latest in security products. The second coil is connected between the second pin and the common pin and coupled to the first coil.

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The audio control signal comprises multiple high potentials and multiple low potentials changed alternately. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Then the second coil Lb senses the magnetic field and generates an induction voltage to activate the buzzer 20. 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. com is the complete industry guide and your ultimate sourcing platform for security products, including but not limited to cheap electronic whistle, discount promotional items, promotional gift.

The oscillation frequency of the audio control signal is completely determined by the single tone-set resistor without a capacitor. 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. A user can choose one sound track of interest by pressing the switch S 1-S 4 to connect a corresponding selection pin K 1-K 4 to the ground G. With respect to the electric whistle of the present invention, the sound IC has sound tracks installed as original equipment.

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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. 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 provide you with the absolute best protection and ongoing support in the security industry today.The oscillation frequency of the oscillation signal is determined by the capacitor C 1 and the resistors R 2, R 3.

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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.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. 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. Because there are fewer passive devices used, the electric whistle of the present invention is compact and the manufacturing cost is relatively low. Compared with the conventional electric whistle, the electric whistle of the present invention has fewer passive devices.

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an oscillation unit connected to the oscillation frequency set pins, the power pin, the audio output pin, the database and the selection pins, generating an audio control signal based on the selection pin which is grounded and sending the audio control signal to the electric switch via the audio output pin, wherein an oscillation frequency of the audio control signal is determined by the tone-set resistor. 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. 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.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. An electric whistle has a power circuit, an inductor, an electric switch, a buzzer, a tone-set resistor and a sound IC. 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. Therefore, the electric whistle of the present invention is compact and can be manufactured at low cost. The capacitor C 1 is adapted to filter unstable noises to gain the stability of the electric whistle of the present invention.