Line breaking type antitheft alarm

Abstract

The invention disclose a line breaking type antitheft alarm which comprises a transformer, a rectifying circuit, a switch, a magnetically controlled switch, a magnet, a first light-emitting diode, a second light-emitting diode, a relay, a time base integrated chip, a four-tone warning chip, a voltage stabilizing tube, a loudspeaker, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, a triode and a battery. When the magnetically controlled switch is turned off, a power supply rapidly charges the second capacitor through the second resistor and a sixth diode, and voltage of the trigger end of and voltage of the reset locking end of a time base integrated circuit also rise; when the voltage of the trigger end of and the voltage of the reset locking end are higher than a threshold value, the output end outputs a low level, a warning circuit works, and the loudspeaker gives an alarm. The line breaking type warning is adopted, a line breaking type warning mode has a breakage-proof function, and the alarm can also be given even if a signal line is destroyed; the line breaking type antitheft alarm is simple in circuit structure, adopted elements are fewer, so that the cost is low, and the line breaking type antitheft alarm is favorable for popularization.

Description

technical field [0001] The invention relates to an anti-theft alarm, in particular to a broken wire anti-theft alarm. Background technique [0002] The security devices in the prior art are widely used and varied. However, general anti-theft alarms are not ideal in effect and are easily damaged. Higher-grade anti-theft alarms have higher costs and cannot be used by ordinary consumers. , Difficult to popularize. Contents of the invention [0003] The object of the present invention is to provide a broken wire anti-theft alarm in order to solve the above problems. [0004] The present invention achieves the above object through the following technical solutions: [0005] The invention includes a transformer, a rectifier circuit, a switch, a magnetic control switch, a magnet, a first light-emitting diode, a second light-emitting diode, a relay, a time-base integrated chip, a four-sound alarm chip, a voltage regulator tube, a loudspeaker, the first diode to The fifth diode...

AI Technical Summary

Problems solved by technology

[0002] The security devices in the prior art are widely used and varied. However, general anti-theft alarms are not ideal in effect and are easily damaged. Higher-grade anti-theft alarms have higher costs and cannot be used by ordinary consumers. , difficult to popularize

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