A: This requires a certain knowledge of electronics and a certain practical ability. Audio DIY can be divided into two types: one is to generate sound only, and the other is to restore audio signal with high fidelity (HIFI). The latter needs to use the most ideal electronic components and circuits at present, although it is homemade and very expensive.

2。 We already have speakers and a power supply. What else do we need?

A: You also need (1) audio sources, such as radio heads, microphones, CD players and other audio sources that need to be amplified. (2) An audio signal amplifier with a certain power is a power amplifier circuit, which needs to be matched with a power supply-whether the voltage is in the form of double voltage or single voltage. Voltage value: too high value will damage the circuit components, too low value will reduce the output power and even change the working state, resulting in the power amplifier circuit not working. (3) If you subdivide whether the speaker here refers to a single moving-coil speaker or a finished speaker or tweeter, in the former case, you need a suitable box to install the speaker on it to prevent the speaker from working normally due to short circuit in the front and rear sound fields. And the speaker power should not be too small, and should match the power of the amplifier. If the speaker power is too small, it is easy to burn out.

3。 What is the circuit diagram?

Answer: The circuit diagram is divided into circuit schematic diagram and circuit wiring diagram. Circuit diagram is a graph that people draw with agreed symbols to represent the circuit structure for the needs of research and engineering. The working principle of the circuit is described in detail, and the trend of components and signals can be understood through the circuit diagram. In this way, when we analyze the circuit, we don't have to ponder the real thing, just hold a drawing.