Disconnected anti-theft alarm circuit (1)
Source: InternetPublisher:D先生 Keywords: Anti-theft alarm alarm circuit transistor Updated: 2021/12/26
Circuit working principle: The first circuit shown in Figure a introduces the working principle. The electronic self-locking switch is composed
of resistors R1, R1, R3, transistor
VT1 and thyristor VS;
the alarm music chip IC, transistor VT2 and speaker B constitute the alarm circuit; the resistor R4 and
LED light-emitting diode constitute the alarm indication circuit.
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