Products from the USA may come with an input voltage of 110V–120V, requiring a step-down transformer. Check the device wattage to select the correct power converter.
•💎【Audio level indicator】: The input is connected in parallel to the two pins of the speaker or the audio output of the headphones, the higher the audio signal voltage (i.e., the higher the volume), the more the number of light-emitting diodes lit up.
•⚡【Supply voltage】: DC9V - 12V
•🎯Through the number of LEDs lit to reflect the strength of the audio signal, adjustable resistor R4 to adjust the strength of the input signal, J2 for the power input, J3 for the control of the display, shorted J3 for the strip display, J3 open circuit is a point display.
•💡【learning target】：Through the assembly, debugging and production of the "Circuit principle and key components" machine, master the working principle of the "Circuit principle and key components", improve the skills of component identification, testing, assembly and debugging of the whole machine, and enhance the comprehensive practical ability.
•💡【1】：Master and understand the specific functions of each part of the circuit in the schematic diagram of "Circuit principle and key components", and improve the ability to read and recognize pictures;
•💡【2】：Compare the schematic diagram and the PCB board to understand the component layout, assembly (direction, process, etc.) and wiring of the "Circuit principle and key components";
From USA
