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Light-operated moth-killing lamp

2016-08-02 04:20  
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Light-operated moth-killing lamp
The light-operated moth-killing lamp circuit is composed of the Triac VT, two-way trigger diode V, photosensitive resistor RG, resistor R, capacitor C, and EL lamp, and it is shown in Figure 4-43. In the daytime, RG is the low resistance state (less than 5kΩ) which is affected by light exposure, and C can not be charged as being shorted by RG, V and VT can not turn on, EL does not shine. In the night, RG is in high-impedance state (greater than 1MΩ) and oc is charged normally, KL lit. R select the lW metal film resistor. RG chooses MG45 series of photosensitive resistor. V selects the DB3 or 2CTS2 two-way trigger diode.