CN103413546A

CN103413546A - Five-watt buzzer

Info

Publication number: CN103413546A
Application number: CN2013103480913A
Authority: CN
Inventors: 黄月华
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-12
Filing date: 2013-08-12
Publication date: 2013-11-27

Abstract

The invention provides a five-watt buzzer. The five-watt buzzer is characterized by comprising a 12V current power source, a non-steady-state multi-vibrator circuit and a buzzing power amplifying circuit; the type of a time-base circuit IC1 in the non-steady-state multi-vibrator circuit is NE555; the buzzing power amplifying circuit is composed of an NPN type transistor BG1, a potentiometer RP2 and a horn type loudspeaker YS. A common weldable buzzer is an active sounder which comprises an oscillating circuit and a piezoelectric ceramic piece, and the weldable buzzer can produce a sound when connected to a direct current without being additionally provided with a voice frequency driving circuit. Even though the common weldable buzzer has the advantages of being convenient to use, wide in application range and the like, most output power of the buzzing is lower than 0.1W, the buzzing coverage area is very limited, and the common weldable buzzer is not suitable for occasions where many people are crowded and noises exist. The purpose of solving the practical problem that the output power of the weldable buzzer is low is achieved by installing a small number of ordinary components on the five-watt buzzer.

Description

Five watts of hummers of power

Technical field

The invention belongs to electronic technology field, is about five watts of hummers of a kind of power.

Background technology

Its parameter of solderable hummer commonly used is that ￠ 10, operating voltage are 3～15V, working current≤7mA, electronic circuit is contained in hummer inside, as: the CPB14A12-4.0 type carries source of sound minisize dc piezoelectric buzzer, it contains the active acoustical generator of oscillatory circuit and piezoelectric ceramic piece, it does not need additional audio drive circuitry, connects direct supply and gets final product sounding.Although it has the advantages such as easy to use, applied widely, its buzzer output power majority is less than 0.1W, makes the coverage of buzzer also very limited, inapplicable in some how noisy occasions.

For solving little this practical problems of solderable hummer output power, through multiple production program test, analysis and comparison, five watts of hummers of power of the present invention only use a small amount of common components and parts namely to realize purpose.

The circuit that below describes five watts of hummers of power of the present invention in detail related correlation technique content in implementation process.

Summary of the invention

Goal of the invention and beneficial effect: it contains the active acoustical generator of oscillatory circuit and piezoelectric ceramic piece solderable hummer commonly used, and it does not need additional audio drive circuitry, connects direct supply and gets final product sounding.Although although it has the advantages such as easy to use, applied widely, its buzzer output power majority is less than 0.1W, makes the buzzer coverage also very limited, inapplicable in some how noisy occasions.For solving little this practical problems of solderable hummer output power, through multiple production program test, analysis and comparison, five watts of hummers of power of the present invention only use a small amount of common components and parts namely to realize purpose.

The circuit working principle: five watts of hummers of power form the stable multi-oscillation circuit by time base circuit IC1 and resistance R 1, resistance R 2, potentiometer RP1 and capacitor C 1.After buzzer circuit was connected the 12V direct supply, because the voltage on capacitor C 1 is very low, the 3rd pin of time base circuit IC1 output terminal was high level.The 12V direct supply charges to capacitor C 1 through resistance R 1, resistance R 2 and potentiometer RP1, voltage on capacitor C 1 progressively rises, when the voltage on capacitor C 1 rises to 2/3 direct supply voltage, the upset of time base circuit IC1 internal trigger, the 3rd pin output low level of time base circuit IC1, the internal discharge pipe conducting of time base circuit IC1 simultaneously, capacitor C 1 power on to press off and begin through the 7th pin electric discharge of resistance R 2 by time base circuit IC1.When the voltage drop on capacitor C 1 during to 1/3 direct supply voltage, time base circuit IC1 internal trigger overturns again, the 3rd pin output high level of time base circuit IC1, internal discharge pipe cut-off simultaneously, the 12V direct supply charges to capacitor C 1 through resistance R 1, resistance R 2 and potentiometer RP1 again, so goes round and begins again and forms vibration.Smaller because of the buzzer output power, increase one-level buzzer power amplification circuit, finally drive horn loudspeaker YS sounding.

Technical characterictic: five watts of hummers of power, it comprises 12V direct supply, stable multi-oscillation circuit and buzzer power amplification circuit, it is characterized in that:

The stable multi-oscillation circuit: it is comprised of time base circuit IC1, resistance R 1, resistance R 2, potentiometer RP1 and capacitor C 1, the model that time base circuit IC1 selects is NE555, the anodal VCC of one termination circuit of the 4th pin of time base circuit IC1 and the 8th pin and resistance R 1, the 7th pin of time base circuit IC1 is connected with the other end of resistance R 1, an end of resistance R 2, the end of another termination potentiometer RP1 of resistance R 2, the 6th pin of time base circuit IC1 is connected with the other end and the movable end thereof of potentiometer RP1 with the 2nd pin, the 1st pin connection circuit ground GND of time base circuit IC1;

The buzzer power amplification circuit: it is comprised of NPN transistor BG1, potentiometer RP2 and horn loudspeaker YS, the base stage of NPN transistor BG1 connects the end of potentiometer RP2, the 3rd pin of the other end of potentiometer RP2 and activity termination time base circuit IC1 thereof, the collector of NPN transistor BG1 is by the anodal VCC of horn loudspeaker YS connection circuit, the emitter connection circuit ground GND of NPN transistor BG1;

The anodal VCC of 12V DC power anode connection circuit, the 12V DC power cathode is connected with circuit ground GND.

The accompanying drawing explanation

Accompanying drawing is the embodiment circuit working schematic diagram that the invention provides five watts of hummers of a power; 12V DC power cathode in accompanying drawing is connected with circuit ground GND.

Embodiment

According to five watts of buzzer circuit fundamental diagrams of power shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in embodiment requires and the circuit production main points are implemented to realize the present invention, below in conjunction with embodiment, correlation technique of the present invention is further described.

The selection of components and parts and technical parameter

IC1 is time base circuit, and the model of selecting is NE555 or LM555, and packing forms is dual inline type 8 pins; Each pin function: 1 pin is circuit ground GND; 2 pin are trigger end; 3 pin output terminals; 4 pin preset ends; 5 pin are for controlling voltage; 6 pin thresholdings (threshold value); 7 pin are discharge end; 8 pin are positive source VCC;

The resistance of potentiometer RP1 is 12K Ω; The resistance of potentiometer RP2 is 4.3K Ω;

The resistance of resistance R 1 is 6.8K Ω; The resistance of resistance R 2 is 3.3K Ω;

C1 is electric capacity, and capacity is 0.022 μ F, and the polypropylene capactive of stable performance is adopted in suggestion;

NPN transistor BG1 selects the middle power tubes such as 2SC2073, requires enlargement factor β >=80;

YS is horn loudspeaker, and impedance is 16 Ω, and rated power is 10W.

Circuit production main points and circuit debugging

Because of the circuit structure of five watts of hummers of power fairly simple, as long as the electronic devices and components performance of generally selecting is intact, and the components and parts annexation in accompanying drawing is welded to specifications, physical connection line and welding quality are after careful inspection is correct, circuit of the present invention does not need to carry out any debugging substantially, and connecting the 12V direct supply can work;

The electric capacity of capacitor C 1 is crucial, and it has determined the oscillation frequency of stable multi-oscillation circuit, most ceramic disc capacitor work less stable, and error is about 20%, and the polypropylene capactive of stable performance is adopted in suggestion; The capacity that changes capacitor C 1 because be not easy changes the oscillation frequency of stable multi-oscillation circuit, and to change the oscillation frequency of stable multi-oscillation circuit more convenient so the resistance of potentiometer RP is adjusted in suggestion;

The adjustment of potentiometer RP1: the resistance of potentiometer RP1 is larger, and the oscillation frequency of stable multi-oscillation circuit is just lower.Potentiometer RP1 coordinates the generation oscillation frequency to be about 2.1HzK to 2.5kHz with capacitor C 1;

When using the 12V direct supply, when if test buzzer output power does not reach 5W, the resistance that can suitably reduce potentiometer RP2 is tried it, but the resistance minimum value of potentiometer RP2 requires to be not less than 510 Ω, otherwise likely affects the stability of buzzer power amplification circuit work or make the buzzer distortion.

Claims

1. five watts of hummers of a power, it comprises 12V direct supply, stable multi-oscillation circuit and buzzer power amplification circuit, it is characterized in that:

Described stable multi-oscillation circuit is comprised of time base circuit IC1, resistance R 1, resistance R 2, potentiometer RP1 and capacitor C 1, the model that time base circuit IC1 selects is NE555, the anodal VCC of one termination circuit of the 4th pin of time base circuit IC1 and the 8th pin and resistance R 1, the 7th pin of time base circuit IC1 is connected with the other end of resistance R 1, an end of resistance R 2, the end of another termination potentiometer RP1 of resistance R 2, the 6th pin of time base circuit IC1 is connected with the other end and the movable end thereof of potentiometer RP1 with the 2nd pin, the 1st pin connection circuit ground GND of time base circuit IC1;

Described buzzer power amplification circuit is comprised of NPN transistor BG1, potentiometer RP2 and horn loudspeaker YS, the base stage of NPN transistor BG1 connects the end of potentiometer RP2, the 3rd pin of the other end of potentiometer RP2 and activity termination time base circuit IC1 thereof, the collector of NPN transistor BG1 is by the anodal VCC of horn loudspeaker YS connection circuit, the emitter connection circuit ground GND of NPN transistor BG1;

The anodal VCC of described 12V DC power anode connection circuit, the 12V DC power cathode is connected with circuit ground GND.