1. There are many dedicated PCB drawing software, such as Protel, etc., you can draw a multi -layer (including double -sided) circuit board diagram. The line is connected to achieve cross -wiring to facilitate typesetting. After the typesetting is completed, it can be handed over to the circuit board of a specific circuit.

　　2. The double -sided circuit board should be drawn into a circuit schematic in turn, which can be divided into two steps. Step 1: First, draw the symbols of the main components such as IC, etc. The position of the circuit board is drawn on the paper, and the connecting lines and peripheral components are appropriately decorated and drawn to complete the sketch. Step 2: Analyze the principle and organize the circuit diagram according to the habit of drawing. You can also use the circuit schematic diagram software to connect the components and then use its automatic typesetting function to organize.

　　The lines on both sides of the double panel should be accurately opposed. You can use the two pointed positioning of the sister -in -law, the flashlight transmission, and the metering of the universal meter to measure the connection and direction of the lines and the lines. The line below.