Basic application of wire control circuit

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The working principle of the device application circuit is shown in Fig. 6. Its typical application is as a line-breaking burglar alarm. X is a very thin enameled wire, which is connected to the circuit, resulting in a unidirectional thyristor (SCR, short for thyristor rectifying element), which is a four-layer structure with three PN junctions. Power semiconductor devices, also known as thyristors, are one of the more commonly used semiconductor devices because of their small size, relatively simple structure, and strong functions. The device is widely used in various electronic devices and electronic products. Control rectifier, inverter, frequency conversion, voltage regulation, contactless switch, etc.) VS trigger pole short to ground. Therefore, the VS cannot trigger the conduction. At this time, the triode VT is in a saturated state, causing the 4 terminals of the controller DM to be low level (below 1.6V), the DM is turned off, and the alarm bell DL is not energized, so the alarm does not work.
Once someone cuts the filament X, there is a current flowing into the trigger pole of the VS, so the VS is turned on and self-locking, so that the base of the transistor VT is at a low level, VT is turned off, and the 4 terminals of the DM become a high level. Then the DM is turned on, so that the DL is energized and an alarm sounds.