How to wire the alarm music chip? Answer: The alarm music chip is wired according to the circuit diagram given to you by the merchant. When you buy this chip, the merchant will give you a circuit diagram. If you don’t get it or lose it, you can ask the merchant for it again; 2) According to the model on the board, you can Checked online: XX voice chip; or refer to similar circuits; 3) Guess and test, generally, there will be a triode on the board, find the positive and negative poles of the power supply and the speaker connection terminals, use two old batteries (voltage Not higher than 3V) as the power supply, the chip will not be damaged if it is connected incorrectly. This method is a bit risky and requires some basic knowledge. Here is the wiring diagram of KD9300 for your reference. In your picture: 3 is connected to battery +, buzzer + (a small speaker can also be used), 4 is connected to ground (battery -), 6 is connected to buzzer -, 4 and 7 are connected to the control switch.