Alarm bell circuit with self-adaptive voltage

Abstract

The invention discloses an alarm bell circuit with a self-adaptive voltage, and belongs to the technical field of an electronic circuit. The alarm bell circuit with the self-adaptive voltage comprisesan alarm bell LED lamp control circuit capable of generating the self-adaptive voltage and an alarm bell switch control circuit, wherein the alarm bell LED lamp control circuit comprises a first interface, a first lamp, a second lamp, a third lamp, a first crystal triode, a second crystal triode, a first resistor and a second resistor, a first pin of the first interface is electrically connectedwith a positive electrode of the first lamp and one end of the first resistor, a negative electrode of the first lamp is electrically connected with a positive electrode of the second lamp, a negativeelectrode of the second lamp is electrically connected with a positive electrode of the third lamp, the self-adaptive voltage function of the alarm bell circuit can be achieved by the circuit at relatively low cost and with simple structure, the application voltage range is wide, different alarm bell circuits are not needed to be designed according to different power supply voltages, and the labor, the resource and the cost in early development and subsequent configuration can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an adaptive voltage alarm bell circuit. Background technique [0002] With the continuous development of high-rise buildings in modern society, the use of elevators is becoming more and more popular. As an active means of transportation in buildings, elevators have become an indispensable and important part of our daily life like other means of transportation. However, elevators will inevitably have many failures during use. In case of emergency, People generally send a fault signal to the outside world through the alarm bell. [0003] At present, the control voltage of the elevator alarm bell mainly has two voltages: 24V and 12V. So at present, our alarm bell circuit needs to be divided into two different voltages, which are designed to be applied to two different voltage alarm bell circuits. The same shape of the alarm bell button, in order to achieve the same ala...

AI Technical Summary

Problems solved by technology

So at present, our alarm bell circuit needs to be divided into two different voltages, which are designed to be applied to two different voltage alarm bell circuits. The same shape of the alarm bell button, in order to achieve the same alarm prompt function, under different power supply voltage conditions , different alarm circuits need to be designed, the flexibility is relatively poor, and more manpower, resources and capital are required for early development and later configuration work

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