CN2177265Y

CN2177265Y - Sound control anti-theft alarm and door bell multipurpose device

Info

Publication number: CN2177265Y
Application number: CN 93246367
Authority: CN
Inventors: 郑克强
Original assignee: HUAZHONG ELECTRIC DEVICE FACTORY CHANGSHOU CITY
Current assignee: HUAZHONG ELECTRIC DEVICE FACTORY CHANGSHOU CITY
Priority date: 1993-12-03
Filing date: 1993-12-03
Publication date: 1994-09-14
Anticipated expiration: 2003-12-03

Abstract

The utility model relates to a sound control anti-theft alarm and doorbell multipurpose device. The utility model is composed of a signal picking amplifying circuit, a delay circuit, an alarm sounding circuit, a doorbell sounding circuit, a power supply, a power supply switch and a selection switch. The sound pressure is utilized to trigger an alarm to sound or a doorbell to sound, and wires are not needed to be connected with a window or a door; so the easy use can be realized.

Description

Sound control anti-theft alarm and door bell multipurpose device

The utility model relates to a kind of acoustic control burglar alarm, doorbell multi-purpose device, triggers alarm sound or doorbell sounding by acoustic pressure.

Usually used warning device is magnetic control, line traffic control or light-operated mostly, also has heat to release infrared alarm recently.All need install control line or power lead additional, heat is released Infrared intrusion detector to the false alarm sometimes of other thermal source in the room.Also can on doorframe, dig a hole when general doorbell is installed, button is placed on outdoors, very inconvenient by dress.

The purpose of this utility model provides a kind of acoustic control burglar alarm, doorbell multi-purpose device, and it is easy to use, without wiring, utilizes door or window to be tunked or when clashing into, when acoustic pressure surpasses regime values, sends alerting signal or doorbell sound.

The utility model is made up of picking up signal amplifying circuit, delay circuit, warning phonation circuit, doorbell phonation circuit, power supply E, power switch K1 and selector switch K2, its picking up signal amplifying circuit is by piezoelectric ceramic piece SP1, coupling capacitance C1, C2, filter capacitor C3, triode BG1, BG2, BG3, resistance R 1, R2, R3 and R4 form.

Fig. 1 is an electrical schematic diagram of the present utility model.

Below in conjunction with Fig. 1 to utility model is further described below.

The picking up signal amplifying circuit, by piezoelectric ceramic piece SP1(or microphone MIC, the dividing potential drop of then will connecting) converts acoustical signal to electric signal with resistance R 0, when impacting acoustic pressure, piezoelectric ceramic piece SP1 voltage increases, pass to the base stage of amplifying triode BG1 by coupling capacitance C1, base current is increased, because the electric current amplification of triode, the collector plate electric current also increases, and collector voltage descends, making triode BG2(through coupling capacitance C2 again is PNP pipe) base voltage descend, make triode BG2 conducting, collector voltage increases, and at triode BG2 collector two paths of signals output is arranged.One the tunnel removes to trigger the doorbell phonation circuit, and another road increases triode BG3 base current to the base stage current-limiting resistance R3 of triode BG3, triode BG3 conducting, and collector voltage is near zero, and this low level signal is triggered delay circuit.Capacitor C 3 is filter capacitors, mainly plays anti-interference effect.Resistance R 2 is the biasing resistor of triode BG1, and the quiescent point of triode BG1 is provided.Resistance R 1 is the collector resistance of triode BG1, and resistance R 4 is the collector resistance of triode BG3.

Delay circuit is made up of 555 time-base integrated circuits, charging resistor R5 and charging capacitor C4.Main effect is the trigger pip of picking up signal amplifying circuit, overturns to be steady-state signal and time-delay, and time-delay is turned into the triggering state for the treatment of after finishing automatically.It is trigger ends that 1 pin of 555 o'clock bases connects power cathode 2 pin, and directly the collector by triode BG3 triggers, and 4 pin are reset terminal, need not reset when constituting chronotron, so this is connected to high level, if end directly powered-down of time-delay.5 pin are control ends, and delay circuit has from turn over function, need not control, are dead end in this circuit.6 pin are the threshold values upset, and 7 pin are discharge ends, and 6,7 bipods are connected together, and connect a capacitor C 4 to negative pole, connect a resistance R 5 again to anodal.The principle of work of delay circuit is: before the triggering, base 2 pin input ends were high level in 555 o'clock, and output terminal 3 pin are low level, and 7 pin are low level, and capacitor C 4 is to the discharge of 7 pin, and capacitor C 4 two ends are 0 volt.After the triggering, 2 pin become low level by high level, and the upset of output terminal 3 pin is high level, control warning phonation circuit sounding, and 7 pin are high-impedance state simultaneously, and capacitor C 4 slowly rises by 0 volt by resistance R 5 chargings, and the rise time is by resistance R 5 and capacitor C 4 decisions.6 pin are the threshold voltage end, when capacitor C 4 rises to threshold voltage, and the circuit upset, output terminal 3 pin become low level by high level, and the warning phonation circuit quits work.

The warning phonation circuit is made up of a slice KD-9561 integrated package and oscillation resistance R6, promotion triode BG4.Its principle of work is that resistance R 6 is formed the RC oscillator with the KD-9561 internal circuit, its frequency is relevant with resistance R 6, KD-9561 inside is provided with frequency dividing circuit, oscillation frequency is divided into various required frequencies, triode BG4 is that sounding promotes pipe, by collector output, and be connected in series a loudspeaker between positive source.

The doorbell phonation circuit, integrated package KD-253, triode BG5, BG6, resistance R 7, R8, R9 and capacitor C 5, C6 form frequently by double-tone.Resistance R 7 is made the inner frequency division of oscillation resistance and KD-253, tell sting, rub-a-dub two audio frequencies, sting, rub-a-dub sound and time of finishing is by resistance R 8, capacitor C 6 and resistance R 9, capacitor C 5 and charging and discharging circuit decision.BG5 is the NPN pipe, and BG6 is the PNP pipe, and triode BG5, BG6 form composite amplifier, and sound signal is had bigger enlargement factor and promotion ability.

Power supply E, power switch K1 and selector switch K2, power supply E adopts battery, and capacitor C 1 is done filtering and is used.This device work after the power switch K1 closure.K2 be report to the police, the doorbell selector switch, on two points in centre with a double-break switch K2 of loudspeaker SP2 two terminations, if these two contacts are connected with the doorbell phonation circuit when triggering, loudspeaker SP2 can hear sting, rub-a-dub.Otherwise selector switch K2 is connected with the warning phonation circuit, and loudspeaker SP2 then sends chimes of doom.

The utility model utilization door or window tunk or when clashing into, when acoustic pressure surpasses regime values, make piezoelectric ceramic piece or microphone convert acoustical signal to electric signal, send alerting signal or doorbell sound, and be without wiring, easy to use during therefore by dress.

Claims

1, a kind of acoustic control burglar alarm, doorbell multi-purpose device, form by picking up signal amplifying circuit, delay circuit, warning phonation circuit, doorbell phonation circuit, power supply E, power switch K1 and selector switch K2, it is characterized in that the picking up signal amplifying circuit is by piezoelectric ceramic piece SP1, coupling capacitance C1, C2, filter capacitor C3, triode BG1, BG2, BG3, resistance R 1, R2, R3 and R4 form.