GB2156123A - Alarms - Google Patents

Abstract

In an environmental alarm (eg a fire or gas alarm, the speed of warning is in direct proportion to the intensity of the phenomenon being measured. Circuitry of an embodiment is given (Fig. 4). <IMAGE>

Description

SPECIFICATION A multi-functional alarm SUMMARY OF THE INVENTION: A multi-functional alarm mainly relates to alarming and producing warning sound with its high sensitive function when the amount of poisonous gas (i.e. CO) in the air is near the harmful degree. When the room temperature is raised up quickly or the amount of combustible gas in the air is almost near to be fired, it also gives the alarm. The speed of warning sound is in direct proportion to the concentration of the poisonous gas.

BRIEF DESCRIPTION OF THE DRAWINGS: Figure 1 is an outline graphic view of the embodiment of the invention.

Figure 2 is an outline graphic view of another embodiment of the invention.

Figure 3 is a diagrammatical view of the invention.

Figure 4 is a graphic view of circuit of the invention.

DETAILED DESCRIPTION OF THE INVEN TION: The prevailing alarms only possess a single function, the sensitivity and effect are not good. Therefore, when in use, it always losses its sensitivity and cause a large damage. Pointing against this defect, the inventor invented this multi-functional alarm. Its sensitivity is very good and suitable for every walk of iife.

Fig. 1 a 2 are the outline graphic views of the embodiment of the present invention. It mainly comprises: housing 1, electric supply ing source indicating lamp 2, alarm indicating lamp 3, ventilative hole of detector 4. Fig. 3 is a diagrammatical view of the present invention, fig. 4 is a graphic view of circuit of the invention. It mainly comprises: electric supplying source 5, detecting part 6 and sound part 7. Electric supplying source is commutated by transformer to supply the circuit that requires.

The second grade coil of transmitter divided into two sets: one is 9V-0-9V (AC) which can get a purified DC electric supplying source after commutation and filtration, and is about 1 2V (DC), its electric supply is indicated by green color LED and current limited resistance; the other set is 5V-0-5V (AC) which can get about 7V DC after commutation (two diodes complete wave circuit) and filtration for the filament of detector 8.Detecting part 6 is composed of detector 8, buffer circuit 9, detecting circuit 10, sensitivity-adjusted circuit 11, triggering gate circuit 12, oscillatory circuit 1 3. When source of electric supply is instantly plugged in, a circuit which is composed of a transistor, resistance, condenser will cause the inner part of detector 7 unstable by the external quickly raised up high voltage and let detecting circuit to produce mistaken alarm. Therefore, knowing from the above mentioned buffer circuit, there can make a buffer action for the backward circuit.

Two resistances of plate on the lower part of detector 7 constitute a sensitivity adjustment, and then through a gate circuit (transistor 2SC1815) to trigger the backward oscillatory circuit. The main body of oscillatory circuit is composed of two transistors and after being supplied electricity by gate circuit, this circuit will begin to oscillate. Sounding part is to insert into the alarm circuit 14 by the signal output from oscillatory circuit (it is constructed by a switch transistor 2SC1015), in order to let transistor conducted and make buzzer 1 5 alarm.

1. A multi-functional alarm, mainly comprises: electric supplying source, detecting part and sounding part; the filament of detector is supplied electricity by the source of electric supply, when detector receives signal to let detecting circuit produce mistaken alarm which is detected by buffer circuit to buffer for backward circuit, through sensitivity-adjusted circuit and a gate circuit to trigger backward oscillatory circuit, and then the signal output from oscillatory circuit inserted into alarm circuit to let transistor conducted and make buzzer alarm.

2. A sensitivity-adjusted circuit as claimed in calim 1, is constituted by two resistances of plate on the lower part of detector.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (2)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A multi-functional alarm SUMMARY OF THE INVENTION: A multi-functional alarm mainly relates to alarming and producing warning sound with its high sensitive function when the amount of poisonous gas (i.e. CO) in the air is near the harmful degree. When the room temperature is raised up quickly or the amount of combustible gas in the air is almost near to be fired, it also gives the alarm. The speed of warning sound is in direct proportion to the concentration of the poisonous gas. BRIEF DESCRIPTION OF THE DRAWINGS: Figure 1 is an outline graphic view of the embodiment of the invention. Figure 2 is an outline graphic view of another embodiment of the invention. Figure 3 is a diagrammatical view of the invention. Figure 4 is a graphic view of circuit of the invention. DETAILED DESCRIPTION OF THE INVEN TION: The prevailing alarms only possess a single function, the sensitivity and effect are not good. Therefore, when in use, it always losses its sensitivity and cause a large damage. Pointing against this defect, the inventor invented this multi-functional alarm. Its sensitivity is very good and suitable for every walk of iife. Fig. 1 a 2 are the outline graphic views of the embodiment of the present invention. It mainly comprises: housing 1, electric supply ing source indicating lamp 2, alarm indicating lamp 3, ventilative hole of detector 4. Fig. 3 is a diagrammatical view of the present invention, fig. 4 is a graphic view of circuit of the invention. It mainly comprises: electric supplying source 5, detecting part 6 and sound part 7. Electric supplying source is commutated by transformer to supply the circuit that requires. The second grade coil of transmitter divided into two sets: one is 9V-0-9V (AC) which can get a purified DC electric supplying source after commutation and filtration, and is about 1 2V (DC), its electric supply is indicated by green color LED and current limited resistance; the other set is 5V-0-5V (AC) which can get about 7V DC after commutation (two diodes complete wave circuit) and filtration for the filament of detector 8.Detecting part 6 is composed of detector 8, buffer circuit 9, detecting circuit 10, sensitivity-adjusted circuit 11, triggering gate circuit 12, oscillatory circuit 1 3. When source of electric supply is instantly plugged in, a circuit which is composed of a transistor, resistance, condenser will cause the inner part of detector 7 unstable by the external quickly raised up high voltage and let detecting circuit to produce mistaken alarm. Therefore, knowing from the above mentioned buffer circuit, there can make a buffer action for the backward circuit. Two resistances of plate on the lower part of detector 7 constitute a sensitivity adjustment, and then through a gate circuit (transistor 2SC1815) to trigger the backward oscillatory circuit. The main body of oscillatory circuit is composed of two transistors and after being supplied electricity by gate circuit, this circuit will begin to oscillate. Sounding part is to insert into the alarm circuit 14 by the signal output from oscillatory circuit (it is constructed by a switch transistor 2SC1015), in order to let transistor conducted and make buzzer 1 5 alarm. CLAIMS

1. A multi-functional alarm, mainly comprises: electric supplying source, detecting part and sounding part; the filament of detector is supplied electricity by the source of electric supply, when detector receives signal to let detecting circuit produce mistaken alarm which is detected by buffer circuit to buffer for backward circuit, through sensitivity-adjusted circuit and a gate circuit to trigger backward oscillatory circuit, and then the signal output from oscillatory circuit inserted into alarm circuit to let transistor conducted and make buzzer alarm.

2. A sensitivity-adjusted circuit as claimed in calim 1, is constituted by two resistances of plate on the lower part of detector.