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.

Precision Electronic Whistle Precision Electronic Whistle

The capacitor C 1 is adapted to filter unstable noises to gain the stability of the electric whistle of the present invention. Out of hours and same day deliveries available please contact our sales office for more information. Then the second coil Lb senses the magnetic field and generates an induction voltage to activate the buzzer 20. We are a premier online security products industry directory that delivers the most comprehensive guide to the latest in security products. For example, when the selection pin K 4 is grounded, the oscillation unit 32 generates the audio control signal of the whistle ringing.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 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.

WHISTLE | Fox 40 International ELECTRONIC WHISTLE | Fox 40 International

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. 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. The selection pins K 1-K 4 respectively correspond to the sound tracks and respectively connect to switches S 1-S 4. When the electric switch is activated, the inductor produces an induction voltage to activate the buzzer.Compared with the conventional electric whistle, the electric whistle of the present invention has fewer passive devices. 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. Because there are fewer passive devices used, the electric whistle of the present invention is compact and the manufacturing cost is relatively low. 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. 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.