Fox 40 Electronic Whistle -DS

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Therefore, the electric whistle of the present invention is compact and can be manufactured at low cost. 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. When the electric switch is activated, the inductor produces an induction voltage to activate the buzzer. 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.

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The oscillation unit which is connected to the oscillation frequency set pins, the power pin, the audio output pin, the database and the selection pins, generates an audio control signal based on the selection pin which is grounded and sends the audio control signal to the electric switch via the audio output pin.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. 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.

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Compared with the conventional electric whistle, the electric whistle of the present invention has fewer passive devices. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. 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. 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.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. 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 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.

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Original Assignee Individual Priority date (The priority date is an assumption and is not a legal conclusion. With respect to the electric whistle of the present invention, the sound IC has sound tracks installed as original equipment. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed. 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 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. 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.