The door light switch installed outside the door is often randomly opened and closed, and is easily damaged. A novel door light switch has been made for this purpose. 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.
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Boluo Xurong Electronics Co., Ltd. , https://www.greenleaf-pc.com