The door light switch outside the door is often opened and closed by people, and it is easily damaged. For this reason, a novel door light switch has been made. This door light switch is percussive and has the function of a doorbell. The circuit is shown in the figure, which is mainly composed of a tap detection circuit, a door light triggering and delay control circuit, a doorbell circuit and a power supply circuit. F1 ~ F4 select CD4093 digital integrated circuit. The music integrated circuit uses the KD-156 model. VT1, VT2 selects SC9014 triode; VT3 selects SC9013 triode; VT4 selects 2SC9012; VT5 selects 2SC8050. RG uses CdS photoresistor. The solid state relay SSR is SP2110. The door light can use a bulb with a power of 40W or 60W. The larger the diameter of the piezoelectric ceramic piece selected by HTD, the higher the sensitivity of knocking the door. Other components are selected as shown.
Zinc aluminum alloy wire, zinc is the matrix, through different aluminum content to meet the needs of different customers, and the use of advanced production technology, strict quality control, surface and inner quality is good and stable, with good mechanical properties. Using in film capacitor surface spray
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