The electronics for the speaker system can be split into two main sections—the power circuit and the audio circuit.
The circuit structure of the electronics is shown in the following diagram:
Note the color coding of the wiring. Here, black shows the power ground, gray shows the audio ground, cyan shows the unamplified audio, blue shows the amplified audio, yellow represents the battery voltage, and red shows 5 V.
Note the color coding of the wiring. This is important as it is the most common way in which different signals and power supplies are identified within an electronic product. There ...