The PCB board (printed circuit board) in the indicator is one of its core components, responsible for connecting and supporting various electronic components, so as to achieve the function of the indicator. By printing the circuit pattern on the insulating substrate, the PCB board provides an effective path for the flow of current to ensure the transmission and control of signals.

In the design of the indicator, the PCB board is usually made of high-quality materials such as FR-4, which can maintain stability under long working conditions due to its excellent insulation and heat resistance. The layout design of the PCB is crucial, and a reasonable layout can effectively reduce signal interference, reduce electromagnetic interference (EMI), and optimize heat dissipation performance to improve the overall reliability and durability of the indicator.

The LED on the indicator is usually welded to the PCB, which is controlled by the circuit to turn on and off and blink, thereby visually communicating the equipment status or working instructions. PCB boards may also integrate other components, such as resistors, capacitors and microcontrollers, to achieve more complex functions, such as multiple flicker modes or color changes, to meet the needs of different application scenarios. In general, the PCB board of the indicator is the basis for connecting electronic components and realizing the control logic, and its design and material selection directly affect the performance and service life of the indicator, which is an indispensable part of modern electronic equipment.