Touch alarm circuit (1)
Source: InternetPublisher:拿铁三分糖 Keywords: Alarm circuit touch type relay transistor Updated: 2020/03/19
Circuit working principle: Transistors VT1 and VT2 form a complementary positive feedback amplifier
. Normally, both VT1 and VT2 are in cut-off state, and relay K does not act. When someone
touches the electrode sheet M, the human body leakage current is output through the high-value resistor R1 and directly sent to
the base of VT1 for amplification. Therefore, VT2 has a strong emitter current flowing through the relay
K, causing K to be electrically closed. , its normally open contact is closed, and the alarm light or bell is turned on.
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