CN1025387C

CN1025387C - Induction door bell

Info

Publication number: CN1025387C
Application number: CN 91100556
Authority: CN
Inventors: 郭湘泗
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-02-01
Filing date: 1991-02-01
Publication date: 1994-07-06
Anticipated expiration: 2006-02-01
Also published as: CN1053316A

Abstract

The present invention relates to a photosensitive induction door bell. The photosensitive induction door bell is composed of a photosensitive resistor, an amplification circuit, a voltage stabilizing circuit, a music integrated block, a driving circuit and a sounding element, wherein the photosensitive resistor is connected with the base electrode of a first triode transistor of the amplification circuit; the voltage stabilizing circuit comprises a triode transistor which is connected between a fourth triode transistor and a fifth triode transistor of the amplification circuit; the output of the amplification circuit is transmitted to a triggering pin of the music integrated block; the output of the music integrated block drives the sounding element through a triode transistor to generate sound. Therefore, the present invention indicates guest visits or prevents crashers from entering rooms by using photosensitive induction.

Description

Induction door bell

The present invention relates to a kind of induction door bell, particularly a kind of photosensitive formula induction door bell.

In order to point out the guest to come to visit or to prevent that undesirable people from entering the room, doorbell or warning device have been installed on the gate of many dwelling houses, these doorbells overwhelming majority is made up of outdoors pushbutton switch and indoor sounding component, do not possess anti-theft alarm function, and that warning device is placed in more is indoor, does not possess the function of common doorbell.

The objective of the invention is to provide a kind of photosensitive formula induction door bell, when owing to the people near make be contained in that door is gone up or door near light activated element receive a light intensity sudden change time, this doorbell just sends the sound.

For realizing above-mentioned purpose of the present invention, the induction door bell that the present invention proposes is by photoresistance, amplifying circuit, mu balanced circuit, music-integrating block and the driving circuit that links to each other and sounding component constitute, photoresistance is connected on the base stage of first transistor, second links to each other by the collector of capacitor with first and second transistors respectively with the base stage of the 3rd transistor, the base stage of the 4th to the 6th transistor links to each other by the collector of resistance with the 3rd to the 5th transistor respectively, the collector of the 6th transistor links to each other with the triggering pin of music-integrating block, the output signal of integrated package drives sounding component through the 8th transistor, first to the 6th transistor is formed amplifying circuit, the 7th transistor is connected between the collector of the 4th and the 5th transistor, it and the Resistor-Capacitor Unit that is connected constitute mu balanced circuit, so that make the working point of amplifying circuit keep stable.During use photoresistance is installed in that door is gone up or door near, when the people is in the door inlet chamber, will inevitably cause the sudden change of the received light intensity of photoresistance, thereby cause the variation of circuit working point, producing a pulse triggers integrated circuit, and the amplification sound of the music signal that sounding component is sent stored in the integrated circuit, when the light intensity that receives when photoresistance was not suddenlyd change, entire circuit was in cut-off state.

Induction door bell of the present invention does not need other switch to trigger, and it can point out the visiting of guest, can prevent illegally entering the room of robber etc. again.

The present invention will be further described below in conjunction with embodiment and accompanying drawing.

Fig. 1 is the electrical schematic diagram of induction door bell of the present invention.

As shown in Figure 1, triode BG ₁-BG ₆Constitute amplifying circuit, BG ₇And other Resistor-Capacitor Unit formation mu balanced circuit, integrated circuit (IC) is a music-integrating block, photoresistance R _gBe connected on triode BG ₁Base stage and emitter between, triode BG ₂And BG ₃Base stage pass through capacitor C respectively ₃And C ₅With triode BG ₁And BG ₂Collector link to each other triode BG ₄-BG ₆Base stage pass through resistance R respectively ₁₂, R ₁₄And R ₁₈With BG ₃-BG ₅Collector link to each other triode BG ₆Collector link to each other the output pin of integrated package and triode BG with the triggering pin of ic chip ₈Base stage link to each other, and drive and be connected on triode BG ₈The loudspeaker Y of collector, K switch ₁Be used to regulate the volume of loudspeaker Y, K switch ₂Be power switch, triode BG ₇Emitter and collector pass through resistance R respectively ₁₃And R ₁₇With triode BG ₄And BG ₅Collector link to each other.At photoresistance R _gWhen the light intensity of last reception does not have sudden change, triode BG ₆Be in cut-off state, loudspeaker Y is sounding not; Work as R _gWhen the light of last reception suddenlyd change, the variation of the circuit working point that this sudden change causes made triode BG ₆Conducting also triggers ic chip, and loudspeaker Y sends the sound equipment of the characteristic frequency of storing in the ic chip.Thereby realize the effect of light-inductive.

Claims

A kind of induction door bell, it is characterized in that, it is by photoresistance, amplifying circuit, mu balanced circuit, music-integrating block, driving circuit and sounding component constitute, photoresistance is connected on the base stage of first transistor of amplifying circuit, second links to each other with the collector of the first and second transistor triodes respectively by capacitor with the base stage of the 3rd transistor, the base stage of the 4th to the 6th transistor links to each other with the collector of the 3rd to the 5th transistor respectively by resistance, the collector of the 6th transistor is connected to the triggering pin of integrated package, the 7th transistor is connected between the collector of the 4th and the 5th transistor and constitutes mu balanced circuit, driving circuit is the 8th transistor, its base stage is connected to the output pin of integrated package, and its collector is connected to sounding component.