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. 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 sound level of the buzzer 20 is directly proportional to the voltage across the second pin L 22 and the common pin L 33. 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.

Electric Whistle | Tiger Supplies

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.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. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list. 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. An electric whistle has a power circuit, an inductor, an electric switch, a buzzer, a tone-set resistor and a sound IC.

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

The oscillation frequency of the audio control signal is completely determined by the single tone-set resistor without a capacitor. 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. For example, when the selection pin K 4 is grounded, the oscillation unit 32 generates the audio control signal of the whistle ringing.With respect to the electric whistle of the present invention, the sound IC has sound tracks installed as original equipment.

Xflyee Electronic Whistle with USB Charging, 3 Tone

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. 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. The oscillation frequency of the audio control signal is determined by the single tone-set resistor without a capacitor.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. Then the second coil Lb senses the magnetic field and generates an induction voltage to activate the buzzer 20. 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. Out of hours and same day deliveries available please contact our sales office for more information.

Electric Whistle, Electric Whistle Manufacturers China Electric Whistle, Electric Whistle Manufacturers

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. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. The first coil La is then activated to induce the second coil Lb for producing the induction voltage corresponding to the audio control signal.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. Original Assignee Individual Priority date (The priority date is an assumption and is not a legal conclusion.