CN202394318U

CN202394318U - Induction doorbell

Info

Publication number: CN202394318U
Application number: CN2011205185010U
Authority: CN
Inventors: 陈子杨; 黄勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-12-10
Filing date: 2011-12-10
Publication date: 2012-08-22
Anticipated expiration: 2021-12-10

Abstract

The utility model relates to an induction doorbell. The induction doorbell consists of a 4.5 V direct current power supply, a power supply switch, an induction type switching circuit, a music circuit and an audio amplification circuit; the induction type switching circuit consists of an induction electrode M, NPN-type transistors V1 to V2 and a trimmer potentiometer RP; and the music circuit and the audio amplification circuit respectively consist of a music integrated circuit IC1, a resistor R1, an NPN-type transistor VT3 and a speaker BL. According to the utility model, the door music bell is triggered to emit sound by human body induction without pressing a doorbell switch with a finger; when a visitor comes around, the doorbell can automatically emit music sound to notify an host to open the door and welcome the visitor; as long as the set height and the position of the induction electrode of the induction doorbell are suitable, the phenomenon that children do hoax can be basically avoided; and the induction electrode of the doorbell can also be placed at a suitable position such as a warehouse door, a window and the like to be used as an anti-theft alarm.

Description

Induction door bell

Technical field

The utility model belongs to electronic technology field, relates to a kind of induction door bell.

Background technology

The ordinary electronic doorbell is general many by being arranged on the outer keyswitch control doorbell of door.This traditional doorbell be difficult to avoid children mischief ground disorderly by, thereby just given it up after having many electronic door bells with a period of time; Two hands are held a lot of article when running into you and going home, and finger can't be rung a doorbell and let the household open the door for you, needs most and informs when the household opens the door, and common doorbell has but become ornaments.

Induction door bell during its position before having the guest to come door, through the induction of human body, makes electronic switching circuit start the electronic door bell circuit automatically and sends elegant music, in time notifies owner to open the door and welcome the guest in.Also can the induction electrode of this doorbell be placed on appropriate locations such as warehouse gate, window, use as burglar alarm.

Cannot see, can not touch because of induction electrode outside door, can stop the generation of children's mischief phenomenon basically.Show through on probation: the installation of this induction type electronic doorbell and use, no matter still family is felt convenient, warm especially per capita to the guest is visiting.

Through the test and the comparison of several kinds of schemes, the utility model uses a small amount of common components and parts to realize that doorbell circuit is simple in structure, cheap, the requirement of dependable performance.Below specify the correlation technique of this induction door bell in manufacturing process.

The utility model content

Goal of the invention and beneficial effect: the utility model comes trigger gate music bell sounding through human body sensing, and moving doorbell switch no longer need press...with one's finger.When the guest was visiting, doorbell can send musical sound automatically, notifies owner to open the door and welcome the guest in.If height and position suitable that the induction electrode of induction door bell is set, the generation that can stop children's mischief phenomenon basically.Also can the induction electrode of this doorbell be placed on appropriate locations such as warehouse gate, window, use as burglar alarm.

The circuit working principle: induction door bell is made up of induction type electronic switch, music circuit and audio amplifier circuit.The induction type electronic on-off circuit is made up of induction electrode M, NPN transistor V1～V2 and trimmer potentiometer RP; Music circuit and audio amplifier circuit are made up of music integrated circuit IC1, resistance R 1, NPN transistor VT3 and loudspeaker BL.

Behind the closed connection of the power switch SW of induction door bell 4.5V direct supply, the induction type electronic on-off circuit gets into holding state.As the people during near induction electrode M; The induced signal of human body is after NPN transistor VT1, the compound amplification of VT2; Make NPN transistor VT2 conducting; 2 pin of music integrated circuit IC1 are triggered and start working, and the music electrical signal of its output carries out power amplification through NPN transistor VT3, drive loudspeaker BL sounding.

Technical characterictic: induction door bell, to form by 4.5V direct supply, power switch, inductive switch circuit, music circuit and audio amplifier circuit, its characteristic comprises:

Inductive switch circuit: form by induction electrode M, NPN transistor V1～V2 and trimmer potentiometer RP; Induction electrode M connects the base stage of NPN transistor VT1; The emitter of NPN transistor VT1 connects the base stage of NPN transistor VT2 and the end of trimmer potentiometer RP; The other end of trimmer potentiometer RP and lever arm connection circuit ground GND thereof; The anodal VCC of the 1 pin connection circuit of the collector of the collector of NPN transistor VT1 and NPN transistor VT2 and music integrated circuit IC1, the emitter of NPN transistor VT2 connects 2 pin of music integrated circuit IC1;

Music circuit and audio amplifier circuit: form by music integrated circuit IC1, resistance R 1, NPN transistor VT3 and loudspeaker BL; Resistance R 1 of cross-over connection between 7 pin of music integrated circuit IC1 and 8 pin; 3 pin of IC 1 connect the base stage of NPN transistor VT3; The anodal VCC of connection circuit behind the collector series connection loudspeaker BL of NPN transistor VT3, the 5 pin connection circuit ground GND of the emitter of NPN transistor VT3 and music integrated circuit IC1.

4.5V the positive pole of direct supply connects the end of power switch SW, the anodal VCC of the other end connection circuit of power switch SW.

Description of drawings

Accompanying drawing 1 is the circuit working schematic diagram of induction door bell; The model of music integrated circuit IC1 in the accompanying drawing 1 is KD9300 or CW9300.

Embodiment

Technical requirement according to the components and parts of the induction door bell fundamental diagram shown in the accompanying drawing 1 and description of drawings and the following stated is implemented, and can realize the utility model.

The selection of components and parts and technical parameter

VT1～VT3 selects 2CS9013 or 2CS8050 type NPN transistor, enlargement factor β >=150 for use;

The music integrated circuit IC1 number of selecting for use is KD9300 or CW9300, and packing forms is soft encapsulation; The pin of the rectangular indentation both sides in the soft encapsulation is 7 pin, 8 pin, and large tracts of land Copper Foil connection circuit ground GND is printed with the positive pole of the pin connection circuit of VDD or VCC printed words, is printed with IN, the OUT printed words are respective pins;

Resistance R 1 is selected 1/4W carbon resister or metalfilmresistor for use, and the resistance of resistance R 1 is 68K Ω;

RP selects trimmer potentiometer for use, and its resistance is 5.6K Ω;

BL selects 0.25～0.5W, 8 Ω D.sp.s for use;

The SW power switch is selected small-sized one pole ship type switch for use;

4.5V direct supply selects for use No. 5 alkaline batteries of 3 joints to form electric battery, also can use other 4.5V D.C. regulated power supplies.

Circuit production, debugging and installation

Induction door bell should be selected the intact components and parts of performance for use; After the annexation of components and parts is welded shown in the circuit working schematic diagram in the accompanying drawing 1; After wiring concerned conscientious confirmation to physics, doorbell circuit need not debugged basically, and connecting the 4.5V direct supply can operate as normal;

The resistance of adjustment trimmer potentiometer RP can change the sensitivity of electronic switching circuit action; Human body is confirmed apart from resistance or the sheet metal area of adjustment induction electrode M or the length of bonding jumper that the distance of door can be through adjusting trimmer potentiometer RP repeatedly;

Induction electrode M uses the scale copper of 15mm * 65mm or length to make greater than the bonding jumper of 300mm, increases the area of sheet metal or the length of bonding jumper and helps to improve the sensitivity that doorbell is responded to; When induction door bell is installed; Can induction electrode M be placed in the position of the about 1.4m of doorframe inner height; The interference that the too low child of being vulnerable in induction electrode M installation site plays and misoperation require both to cannot see, also can not touch for good with induction electrode M in the door outside.

Claims

1. an induction door bell is made up of 4.5V direct supply, power switch, inductive switch circuit, music circuit and audio amplifier circuit, and its characteristic comprises:

The inductive switch circuit is made up of induction electrode M, NPN transistor V1～V2 and trimmer potentiometer RP; Induction electrode M connects the base stage of NPN transistor VT1; The emitter of NPN transistor VT1 connects the base stage of NPN transistor VT2 and the end of trimmer potentiometer RP; The other end of trimmer potentiometer RP and lever arm connection circuit ground GND thereof; The anodal VCC of the 1 pin connection circuit of the collector of the collector of NPN transistor VT1 and NPN transistor VT2 and music integrated circuit IC1, the emitter of NPN transistor VT2 connects 2 pin of music integrated circuit IC1;

Music circuit and audio amplifier circuit are made up of music integrated circuit IC1, resistance R 1, NPN transistor VT3 and loudspeaker BL; Resistance R 1 of cross-over connection between 7 pin of music integrated circuit IC1 and 8 pin; 3 pin of IC 1 connect the base stage of NPN transistor VT3; The anodal VCC of connection circuit behind the collector series connection loudspeaker BL of NPN transistor VT3, the 5 pin connection circuit ground GND of the emitter of NPN transistor VT3 and music integrated circuit IC1.

2. induction door bell according to claim 1 is characterized in that: the positive pole of 4.5V direct supply connects the end of power switch SW, the anodal VCC of the other end connection circuit of power switch SW.