Nowadays, delay switches are used in many building interiors. This can be said to be everywhere in our lives, and it is also widely used. Presumably everyone will not feel strange. If you really want to say the details of the delay switch, and quickly and accurately answer what is the delay switch, most people may be confused. Here we will specifically introduce about the principle of delay switch , as well as the relevant content of the delay switch purchase strategy and features. 
Delay switch principle
1, for the principle of delay switch, many people do not have too much understanding of it, so next we have a deep understanding of the first, the first delay switch circuit is the right side of the dotted line of ordinary lighting circuit, the left is the electronic switch section. VD1 ~ VD4, VS constitute the main circuit of the switch, IC constitutes the switch control circuit, usually = VS is off, the light does not light. VD1 ~ VD4 output 220V ripple current through R5 current limit, VD5 regulator, C2 filter output about 12V DC power supply for IC use, LED light at this time, indicating the switch position, easy to find the switch at night. 
2, then the IC is two D flip-flops, we only need to use one of the D flip-flops, you can turn it into a monostable circuit, and then in a steady-state output 1 pin low, VS off Broken. When the human hand touches the electrode M, the human body leakage current is divided by R1 and R2. The positive monocycle circuit is toggled in the positive half cycle, and the high level is output in the 1st leg. The R4 is applied to the gate of the VS to make the VS turn on. bright. At this time, 1-pin output high level is charged to capacitor C1 by R3, so that the 4-pin level gradually increases until the end of the transient state, the circuit returns to a steady state, a 1-pin mutation is low, VS loses the trigger voltage, alternating current zero crossing When it is turned off, the light goes out.
Delay switch purchase strategy and features
1, purchase Raiders
Check the quality: there are many buyers who choose in the market, it is inevitable that some people will not know how to choose a good delay switch texture, in general, the surface should be bright color, and there is no glitches on the edge. 
View the appearance: From the appearance of the time delay switch, the general texture of the switch will have the function of compression deformation, so we have to pay special attention when buying.
View the brand: The brand of time-delay switch on the market has always been numerous, so we not only want to use a good brand as the first choice, but also how important is its after-sales service. It needs certain protection.
Check the packaging: Next, you can also check the appearance of the product packaging. Generally speaking, the products of the regular merchants will indicate the trademarks, rated voltage, and the site on the packaging. If the printing is not clear, it can basically be judged to be inferior.
2. Features
Generally, when we use the delay switch, when we go to a certain area, we can make the light be turned on through the sound wire and touch, so that we can see the road ahead and we don't need to turn it back. light. Because the lamps and lanterns will automatically close within 30 to 75 seconds after people leave, it is more convenient. In China, the majority of the population is. If one person is wasted, China’s billion people will waste a lot of energy. The delay switch automatically turns off when people leave, and does not require people to manually close it, avoiding waste and saving energy. Whether it is a sound-wire switch or a touch switch, it uses electric energy below 36V, which belongs to human body safety voltage and is harmless to the human body. 
The above related to the delay switch principle , as well as the relevant content of the delay switch purchase strategy and features are introduced here, I hope these will help everyone. If you still don't understand where you can pay attention to more news, if you want to learn more about this news, please continue to pay attention to our website.
Application
· Mesh weaving.
· Tying wire in architectural site.
· Making handicrafts.
· Material of mesh and fence.
· Packing life products.
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