What is a tap switch? What components does it consist of? What are the installation methods?

Let's introduce the light touch switch from the above points. The light touch switch is also called sensitive switch. Its working mode is to turn on and off the circuit through different operating forces and directions (the circuit diagram is shown in the figure below).

Next, let's talk about its composition. The light touch switch consists of five parts: pin, base, shrapnel (also known as pot piece), button and upper cover. The button refers to the place where the switch is pressed by external force. Shrapnel is the key component of the light touch switch. The on and off of the switch depends on the force deformation of shrapnel and contact with two groups of pins to play the role of conduction. The pins are generally in pairs, and there are only two pins, or five pins. In pairs, there is one for grounding. Only when the touch switch is pressed by the correct operating force, the four pairs of pins will be turned on. In the natural state, the circuit of the switch is disconnected.

There are two common touch switches: plug-in (DIP) and patch (SMT). Then the welding methods of these two light touch switches will also be different. SMT touch switches are mostly soldered to PCB by reflow soldering. The welding conditions are shown in the figure below:

The welding method of dip light touch switch is wave soldering. The welding conditions are as follows:

Of course, manual welding can also be used. Generally, the solder temperature of manual welding is recommended to be ≤ 350 ℃, and the welding time is ≤ 3 seconds.