Disconnected anti-theft alarm circuit (2)
Source: InternetPublisher:武林萌主 Keywords: Anti-theft alarm alarm circuit trigger thyristor Updated: 2021/10/22
The working principle of the circuit: When the thyristor is on, the trigger terminal of the thyristor is connected to the ground, making it in
a cut-off state. When someone breaks the anti-theft lead A, the thyristor trigger terminal receives a trigger
voltage and conducts, and the complementary oscillator composed of VT1 and VT2 is powered to work and makes
a "beep" sound. At the same time, the stroboscopic light-emitting diode LED also
glows flashingly due to the conduction of the thyristor , telling someone to steal something. S is the alarm release switch.
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