Lighting sound and light switch circuit 2
Source: InternetPublisher:念慈菴 Keywords: Switch circuit light control switch BSP Updated: 2021/01/30
It is an SGK-I type sound and light control switch circuit . The working principle of this circuit is basically the same as Figure 2-111. The circuit forms
are different as follows.
① Added light-emitting diode VL for power indication and working status indication. When the light is off, VL is on; when the light
is on, VL is off because the thyristor V is conducting.
② The light control sensitivity is adjusted with the voltage dividing resistor Rr; capacitor C3 is connected in parallel to both ends of the photoresistor RG to improve
the anti-interference performance of the light control switch.
③ Add diode VD to improve the reliability of system operation.
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