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Waterproof switches use semiconductor diodes in almost all electronic circuits. A remote control potentiometer is a resistive element with three terminals, whose resistance value can be adjusted according to a certain pattern of variation. A potentiometer usually consists of a resistive body and a movable brush. As the brush moves along the resistor, a resistance value or voltage that is related to the amount of displacement is obtained at the output terminal. A DC socket is a type of socket designed to work with the dedicated power supply for computer monitors. It consists of a horizontal plug slot, a vertical plug slot, an insulating base, fork-shaped contact springs, and orientation keyways. The two fork-shaped contact springs are located in the center of the base, arranged vertically and horizontally without being connected to each other. Waterproof switches provide great safety by enabling users in many households to use electricity safely in damp areas such as bathrooms and kitchens. There are currently quite a variety of waterproof switches available on the market. It plays an important role in many circuits. It is one of the earliest semiconductor devices and is widely used. A crystal diode is a p-junction formed by a p-type semiconductor and an n-type semiconductor, which creates space charge layers on both sides of its interface and possesses an internal electric field. When no external voltage is applied, the diffusion current caused by the difference in carrier concentrations on either side of the p-junction is equal to the drift current caused by the self-generated electric field, resulting in an electrical equilibrium state. Waterproof switches use diodes; however, the switching speed of ordinary diodes is not high enough for such switch circuits. Therefore, a special switching diode is used in these switch circuits, as shown in the equivalent circuit diagram. As can be seen, in this case it is equivalent to turning on and off the diode switch Sl at the same time, with two resistors present. The switch SL in the equivalent circuit can be regarded as an ideal switch, that is, its on-resistance is as low as zero, while its off-resistance is as high as infinity. Based on the way in which switching devices are connected in a circuit, the widely used switching power supplies can be divided into three categories: series switching power supplies, parallel switching power supplies, and transformer-based switching power supplies. Among them, the switching power supply transformer of a small microswitch (hereinafter referred to as the switching power supply transformer) can be further classified into: push-pull, half-bridge, full-bridge, and others; based on the excitation phase and the output voltage of the transformer, it can also be classified into: forward, reverse, single-excitation, dual-excitation, and others. From a usage perspective, it can also be divided into various types of series switching power supplies. The drawback is that input and output share the same ground, which can easily lead to electromagnetic interference and charging of the circuit board. When the input voltage is the output voltage of a mains rectifier, it can easily cause electric shock accidents, which is unsafe for humans.