How to divide the positive and negative poles of the circuit board, and how to divide the positive and negative poles.

The way to find the ground wire on the circuit board is 1, and the large area copper foil wire is the ground wire. Usually, the copper foil of ground wire is thicker than ordinary wire, and the whole circuit board is connected everywhere. 2. The metal shell of the element is the grounding wire. Some components are made of metal, such as switches, which are grounded in the circuit. 3. The metal mesh of the shielded wire is the ground wire. 4. The negative plate grounding wire of the largest electrolytic capacitor. In addition, according to the color of your wire, red is usually connected to the positive electrode and yellow to the negative electrode. You can compare it yourself and it should be clear.