CN203366728U

CN203366728U - High-loudness buzzer

Info

Publication number: CN203366728U
Application number: CN 201320484677
Authority: CN
Inventors: 何林
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-09
Filing date: 2013-08-09
Publication date: 2013-12-25
Anticipated expiration: 2023-08-09

Abstract

The utility model provides a high-loudness buzzer, which is characterized by comprising a 9V DC power supply, an astable multivibrator circuit and a buzzing output circuit, wherein the astable multivibrator circuit is composed of a time-base circuit IC1, a resistor R1, a resistor R2, a potentiometer RP and a capacitor C1, and the selected model of the time-base circuit IC1 is NE555. Though a commonly used weldable buzzer has the advantages of convenient use and wide application range, the buzzing output power is small, and the buzzing coverage area is very limited, thereby being inapplicable in some noisy occasions. In order to solve the problem of small power of the weldable buzzer, the high-loudness buzzer realizes the expected purpose by using a small amount of ordinary components through testing, analyzing and comparing of a plurality of schemes.

Description

High loudness hummer

Technical field

The utility model belongs to electronic technology field, relates to a kind of high loudness hummer.

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, and connecting direct supply can sounding.Although it is easy to use, applied widely that it has advantages of, its buzzer output power is little, and the buzzer coverage is also very limited, and some noisy occasion is inapplicable.

For solving little this problem of solderable hummer power, through kinds of schemes test, analysis and comparison, high loudness hummer described in the utility model only uses a small amount of common components and parts to realize the expection purpose.

The circuit that below illustrates high loudness hummer described in the utility model related correlation technique content in implementation process.

The utility model content

Goal of the invention and beneficial effect: although solderable hummer commonly used it have advantages of easy to usely, applied widely, its buzzer output power is little, the buzzer coverage is also very limited, some noisy occasion is inapplicable.For solving little this problem of solderable hummer power, through kinds of schemes test, analysis and comparison, high loudness hummer described in the utility model only uses a small amount of common components and parts to realize the expection purpose.

The circuit working principle: it forms the stable multi-oscillation circuit by time base circuit IC1 and resistance R 1, resistance R 2, potentiometer RP and capacitor C 1.After buzzer circuit is connected the 9V direct supply, because the voltage on capacitor C 1 is very low, the 3rd pin of time base circuit IC1 output terminal is high level.The 9V direct supply charges to capacitor C 1 through resistance R 1, resistance R 2 and potentiometer RP, 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 powers on and presses off the 7th pin electric discharge by time base circuit IC1 through resistance R 2 of beginning.Voltage drop on capacitor C 1 is 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 9V direct supply charges to capacitor C 1 through resistance R 1, resistance R 2 and potentiometer RP again, so goes round and begins again and forms vibration.

Technical characterictic: high loudness hummer, it comprises 9V direct supply, stable multi-oscillation circuit and buzzer output 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 RP 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 RP 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 RP with the 2nd pin, the 1st pin connection circuit ground GND of time base circuit IC1;

The buzzer output circuit: the 3rd pin of time base circuit IC1 connects the positive pole of electrochemical capacitor C2, and the negative pole of electrochemical capacitor C2 connects the end of piezoelectricity singing piece HA, the other end connection circuit ground GND of piezoelectricity singing piece HA;

The anodal VCC of 9V DC power anode connection circuit, the 9V DC power cathode is connected with circuit ground GND.

The accompanying drawing explanation

Accompanying drawing is the embodiment circuit working schematic diagram that the utility model provides a high loudness hummer; 9V DC power cathode in accompanying drawing is connected with circuit ground GND.

Embodiment

According to high loudness buzzer circuit fundamental diagram shown in the drawings and accompanying drawing explanation, and according to annexation between components and parts in the described each several part circuit of utility model content, and the components and parts technical parameter described in embodiment requires and the circuit production main points are implemented to realize the utility model, below in conjunction with embodiment, correlation technique of the present utility model is further described.

The selection of components and parts and technical parameter thereof

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 resistance R 1 is 6.8K Ω; The resistance of resistance R 2 is 2.2K Ω; The resistance of potentiometer RP is 12K Ω;

C1 is polypropylene capactive, and capacity is 0.022 μ F; C2 is electrochemical capacitor, and capacity is 1000 μ F/25V;

HA is piezoelectricity singing piece, diameter ￠ 42mm, and maximum sound intensity is 110dB, the diameter of piezoelectricity singing piece can not be less than 30mm, otherwise the responding range of frequency will be affected;

The operating voltage range of 9V direct supply is 9～12V, and the voltage of direct supply is higher, and the output power of buzzer is larger.

Circuit production main points and circuit debugging

Because of the circuit structure of high loudness hummer 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 utility model does not need to carry out any debugging substantially, and connecting the 9V 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 suggestion adopts the polypropylene capactive of stable performance; Because the capacity that is not easy to change capacitor C 1 changes the oscillation frequency of stable multi-oscillation circuit, so the resistance of potentiometer RP is adjusted in suggestion, to change the oscillation frequency of stable multi-oscillation circuit more convenient;

The adjustment of potentiometer RP: the resistance of potentiometer RP is larger, and the oscillation frequency of stable multi-oscillation circuit is just lower.The oscillation frequency that potentiometer RP and capacitor C 1 produce is about 2.1HzK to 2.5kHz;

The complete machine maximum operating currenbt is 110mA, because circuitry is discontinuity work, so average working current is less than 95mA, therefore can use general dry battery as the 9V direct supply.

Claims

1. one kind high loudness hummer, it comprises 9V direct supply, stable multi-oscillation circuit and buzzer output 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 RP 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 RP 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 RP with the 2nd pin, the 1st pin connection circuit ground GND of time base circuit IC1;

In described buzzer output circuit, the 3rd pin of time base circuit IC1 connects the positive pole of electrochemical capacitor C2, and the negative pole of electrochemical capacitor C2 connects the end of piezoelectricity singing piece HA, the other end connection circuit ground GND of piezoelectricity singing piece HA;

The anodal VCC of described 9V DC power anode connection circuit, the 9V DC power cathode is connected with circuit ground GND.