Fox 40 Electronic Whistle -DS

Product Information

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. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. 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.

WHISTLE | Fox 40 International ELECTRONIC WHISTLE | Fox 40 International

Original Assignee Individual Priority date (The priority date is an assumption and is not a legal conclusion. 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.The first coil La is then activated to induce the second coil Lb for producing the induction voltage corresponding to the audio control signal. 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. For example, the selection pin K 1 corresponds to the long beeps, the selection pin K 2 corresponds to the short beeps and the selection pin K 4 corresponds to the whistle ringing. Because there are fewer passive devices used, the electric whistle of the present invention is compact and the manufacturing cost is relatively low. 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.

Xflyee Electronic Whistles 4 Pack, Loudest Electric Whistles

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. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list. An electric whistle has a power circuit, an inductor, an electric switch, a buzzer, a tone-set resistor and a sound IC. When the electric switch is activated, the inductor produces an induction voltage to activate the buzzer.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. 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. Out of hours and same day deliveries available please contact our sales office for more information.

Electric whistle - Google Patents US8760272B2 - Electric whistle - Google Patents

Then the second coil Lb senses the magnetic field and generates an induction voltage to activate the buzzer 20. The electric whistle is more sanitary than a conventional whistle which is put into the mouth because the electric whistle can buzz loudly without being blown.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.

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We are a premier online security products industry directory that delivers the most comprehensive guide to the latest in security products. With respect to the electric whistle of the present invention, the sound IC has sound tracks installed as original equipment.The oscillation frequency of the oscillation signal is determined by the capacitor C 1 and the resistors R 2, R 3. For example, when the selection pin K 4 is grounded, the oscillation unit 32 generates the audio control signal of the whistle ringing. The oscillation frequency of the audio control signal is completely determined by the single tone-set resistor without a capacitor. The audio control signal comprises multiple high potentials and multiple low potentials changed alternately. Therefore, the electric whistle of the present invention is compact and can be manufactured at low cost.