CN2260346Y - Portable alarming device - Google Patents

Abstract

The utility model discloses a pocket personal alarm device, which comprises a circuit and a resonant cavity. The pocket personal alarm device makes use of two No. 5 batteries as a power supply and adopts a sound chip to send out alarm signals. Through the amplification of a triode and the boosting of an autotransformer, the alarm signals are sent to a piezoelectric buzzing sheet, send out alarm sound, and achieve enough volume through a resonant cavity body. The utility model has the advantages of small size and low power consumption, which can be used for body defense and alarm in nights.

Description

Pocket alerter

The utility model relates to a kind of electronic alarm, the pocket alerter that carries in particular for the individual.

Pocket alerter is to send alarm sound to the external world under personal emergency, with the warning utensil of seeking to succour.Generally all small and exquisite body is light, be easy to carry, but in order to reach enough warning volumes, generally adopts the high energy high-tension battery to make power supply, and this just makes the use of this series products be restricted.

The purpose of this utility model provides a kind of pocket alerter that uses common batteries.

For achieving the above object, the utility model adopts following solution: pocket alerter comprises circuit and resonator two parts.Circuit is made up of jack, switch, direct supply, audio ic, resistor, triode, autotransformer and piezoelectricity singing piece.The positive pole of direct supply connects the source electrode of integrated circuit and 2,3 pin of transformer by switch and jack; The output of integrated circuit connects the base stage of triode, and the collector of triode connects 1 pin of transformer and a utmost point of piezoelectricity singing piece, and secondary coil 4 pin of transformer connect another utmost point of piezoelectricity singing piece; The grounding leg of integrated circuit connects the emitter of triode, and together is connected to the negative pole of direct supply; The other bipod cross-over connection resistor of integrated circuit; Piezoelectricity singing piece is bonded on the organ for resonance.

The utility model is to send alerting signal by acoustics circuit, amplifies through triode, and signal is added to the input end of autotransformer, and boosting through transformer outputs to piezoelectricity singing piece and send alarm sound.Because piezoelectricity singing piece is to be bonded on the special compound resonator, after the alarm sound process resonator sympathetic response that is exaggerated, can reach stronger volume.

Direct supply of the present utility model can use No. 5 batteries of two joints, and sound can reach about 100dB, sends 30 minutes continuously, and volume does not have obviously and weakens; Can have the function of electric torch concurrently; Volume is little, power consumption is low, is the ideal tools of people's walking along the street at night, self-defense alarming.

Further specify structure of the present utility model below in conjunction with drawings and embodiments.

Fig. 1 is an electrical schematic diagram of the present utility model;

Fig. 2 is the structural representation of organ for resonance;

Fig. 3 is Fig. 2 A-A cut-open view.

Among Fig. 1, direct supply B adopts No. 5 batteries of two joints, and K switch is in parallel with jack J to be for the double starting alarm switch is set, and the effect that key can not turn-off alarm sound of pulling up is arranged.K switch adopts three throw switches, and one of them contact can connect a bulb L, and the negative pole of another termination direct supply B of L makes alarm have the function of electric torch concurrently.Integrated circuit (IC) adopts sound equipment sheet 9561, and the resistance R of cross-over connection is 150K; Triode Q employing 9013 or 2SC2120; Autotransformer TR adopts step-up transformer, and at the beginning of it, the turn ratio of secondary coil is 1: 15-20.The circuit of alarm is contained in the small and exquisite box body, has resonator 5 on the box body, and piezoelectricity singing piece 6 is bonded on the resonator 5, and resonator 5 is the cavitys with circle or elliptic cross-section.

Claims (5)

1, a kind of pocket alerter, comprise circuit and organ for resonance, circuit is made up of jack J, K switch, direct supply B, resistor R, collection face IC circuit, transistor Q, autotransformer TR and piezoelectricity singing piece BU, it is characterized in that the positive pole of direct supply B connects the source electrode VDD pin of integrated circuit (IC) and 2,3 pin of autotransformer TR by K switch and jack J; The output OUT pin of IC connects the base stage of triode Q, and the collector of Q connects 1 pin of transformer TR primary coil and the utmost point of piezoelectricity singing piece BU, and 4 pin of the secondary coil of TR connect another utmost point of BU; The grounding leg Vss of IC connects the emitter of transistor Q, and together is connected to the negative pole of power supply B, the other bipod OSC1 of IC, OSC2 cross-over connection resistance R; Piezoelectricity singing piece is bonded on the organ for resonance.

2, pocket alerter according to claim 1 is characterized in that said direct supply B adopts No. 5 batteries of two joints.

3, pocket alerter according to claim 1 is characterized in that said K switch is three throw switches, and one of them contact connects a bulb L, and another utmost point of bulb L is connected to power cathode.

4, pocket alerter according to claim 1 is characterized in that said autotransformer TR is a step-up transformer, and the turn ratio of its primary and secondary coil is 1: 15-20.

5, pocket alerter according to claim 1 is characterized in that said organ for resonance is a cavity with circle or elliptic cross-section.

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