CN202711430U - Earthquake alarm circuit - Google Patents

Abstract

The utility model discloses an earthquake alarm circuit. The earthquake alarm circuit comprises a power supply, a wire ring, a wire, a sash weight which is vertically hanged through the wire and passes through the wire ring, a first resistor, a second resistor, a first capacitor, a second capacitor, a PNP type transistor, a NPN type transistor, and a loudspeaker. The anode of the power supply, the first capacitor, the first resistor, the second resistor, the second capacitor and the collector of the NPN type transistor are connected successively. The anode of the power supply, the loudspeaker and the collector of the NPN type transistor are connected successively. The wire ring and the emitter of the NPN type transistor are connected with the cathode of the power supply separately. The emitter of the PNP type transistor is connected with the anode of the power supply, the base of the PNP type transistor is connected with the connected end of the first resistor and the second resistor, and the collector of the PNP type transistor is connected with the base of the NPN type transistor. The wire is connected with the connected end of the first capacitor and the first resistor. According to the utility model, advantages of simple structure and easy implementation are realized, and an intermittent alarm sound can be generated.

Description

A kind of earthquake alarming circuit

Technical field

The utility model relates to a kind of earthquake alarming circuit.

Background technology

Earthquake is the attendant phenomenon in a kind of earth movements change procedure, therefore also is referred to as earthquake, is recurrent a kind of sudden spontaneous phenomenon.When earthquake arrives, if the local resident can know earthquake information in time, take rational measure, the protection of their lives and properties there is epochmaking meaning.Yet at present China and in the world many countries the research of earthquake is mainly concentrated on the departments of large-scale national structure such as State Seismological Bureau, seismic centre.Earthquake information is compiled by these institutional sectors first, sends at last again, has great retardance.Therefore, need a kind of small-sized earthquake alarming equipment, in real time seismic monitoring is carried out in its location, when earthquake occurs, send warning near people, remind people to take certain safeguard procedures at once.But the most cost of this class earthquake alarming device is high, and mechanism is complicated, and sensitivity is low, and the alarm song that sends is too dull, is difficult for attracting much attention.

Summary of the invention

The purpose of this utility model be to provide a kind of simple in structure, be easy to make, with low cost and can send the earthquake alarming circuit of the interrupted chimes of doom that pipes.

The technical scheme that realizes above-mentioned purpose is:

A kind of earthquake alarming circuit, comprise power supply, conductor loop, wire, by described wire vertical hanging and pass sash weight, the first resistance, the second resistance, the first electric capacity, the second electric capacity, positive-negative-positive triode, NPN type triode and the loudspeaker of described conductor loop, wherein:

The collector of the positive pole of described power supply, the first electric capacity, the first resistance, the second resistance, the second electric capacity and NPN type triode connects successively;

The collector of the positive pole of described power supply, loudspeaker and NPN type triode connects successively;

The emitter of described NPN type triode connects the negative pole of described power supply;

Described positive-negative-positive triode, its emitter connects the positive pole of described power supply, and its base stage connects the end that joins of described the first resistance and the second resistance, and its collector connects the base stage of described NPN type triode;

Described wire connects the end that joins of described the first electric capacity and the first resistance;

Described conductor loop connects the negative pole of described power supply.

Above-mentioned earthquake alarming circuit, wherein, described wire is silver-coated copper wire.

The beneficial effects of the utility model are: the utility model, attracts much attention so that produce the interrupted chimes of doom that pipes easily by adding oscillatory circuit.Simultaneously, the utility model is simple in structure, be easy to make and with low cost the delay issue of seismic study mechanism issue earthquake information when greatly having remedied earthquake.

Description of drawings

Fig. 1 is the circuit diagram of earthquake alarming circuit of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

See also Fig. 1, earthquake alarming circuit of the present utility model, comprise power supply V, conductor loop 2, wire 3, by wire 3 vertical hangings and sash weight 1, the first resistance R 1, the second resistance R 2, the first capacitor C 1, the second capacitor C 2, positive-negative-positive triode Q1, NPN type triode Q2 and the horn in H of passing conductor loop 2, wherein:

When sash weight 1 was static, wire 3 was not touched with conductor loop 2;

The collector of the positive pole of power supply V, the first capacitor C 1, the first resistance R 1, the second resistance R 2, the second capacitor C 2 and NPN type triode Q2 connects successively;

The collector of the positive pole of power supply V, horn in H and NPN type triode Q2 connects successively;

The emitter of NPN type triode Q2 connects the negative pole of power supply V;

The emitter of positive-negative-positive triode Q1 connects the positive pole of power supply V, and the base stage of positive-negative-positive triode Q1 connects the end that joins of the first resistance R 1 and the second resistance R 2, and the collector of positive-negative-positive triode Q1 connects the base stage of NPN type triode Q2;

Wire 3 connects the end P that joins of the first capacitor C 1 and the first resistance R 1;

Conductor loop 2 connects the negative pole of power supply V.

In the present embodiment, wire 3 is silver-coated copper wire.

Principle of work of the present utility model: conductor loop 2 is fixing, and the top of wire 3 is fixed on wall or roof etc. and is difficult for being moved and difficult place of being run into by the people by wind.The P point is the end that joins of the first capacitor C 1 and the first resistance R 1 among the figure.The first resistance R 1, the second resistance R 2, the second capacitor C 2, positive-negative-positive triode Q1 and NPN type triode Q2 form oscillatory circuit.When earthquake occured, sash weight 1 swung, and wire 3 is collided with conductor loop 2, made power supply V to 1 charging of the first capacitor C, the oscillatory circuit starting oscillation, and horn in H is sent interrupted chimes of doom.In oscillatory circuit when vibration,, the lower oscillation frequency of P point voltage is higher, and the P point voltage high oscillation frequency of healing is lower.When earthquake occured, wire 3 whenever bumped once with conductor loop 2, and power supply V fills once electricity to the first capacitor C 1, when just being full of electricity, the P point voltage is minimum. and oscillation frequency is the highest, along with the vibration of circuit, the first capacitor C 1 is discharged gradually, and the P point voltage raises gradually, and oscillation frequency also descends thereupon.During earthquake, horn in H send always " tick ... toot ..., tick ... toot ... " chimes of doom, megaphonia.After the seismic event, sash weight 1 amplitude of oscillation reduces, and wire 3 is no longer collided with conductor loop 2, when the first capacitor C 1 is discharged, and the oscillatory circuit failure of oscillations, automatic stop alarm.

Above embodiment is only for illustration of the utility model, but not to restriction of the present utility model, person skilled in the relevant technique, in the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.

Claims (2)

1. earthquake alarming circuit, it is characterized in that, comprise power supply, conductor loop, wire, by described wire vertical hanging and pass sash weight, the first resistance, the second resistance, the first electric capacity, the second electric capacity, positive-negative-positive triode, NPN type triode and the loudspeaker of described conductor loop, wherein:

The collector of the positive pole of described power supply, the first electric capacity, the first resistance, the second resistance, the second electric capacity and NPN type triode connects successively;

The collector of the positive pole of described power supply, loudspeaker and NPN type triode connects successively;

The emitter of described NPN type triode connects the negative pole of described power supply;

Described positive-negative-positive triode, its emitter connects the positive pole of described power supply, and its base stage connects the end that joins of described the first resistance and the second resistance, and its collector connects the base stage of described NPN type triode;

Described wire connects the end that joins of described the first electric capacity and the first resistance;

Described conductor loop connects the negative pole of described power supply.

2. earthquake alarming circuit according to claim 1 is characterized in that, described wire is silver-coated copper wire.