DIY Sound Control Music Crystal Column Spectrum Electronic Kit Single Chip Microcomputer Optical Cube Kit

Description The audio signal picked up by the microphone MK1 is coupled to the op amp U1A by C1 for voltage amplification The amplified audio signal is rectified by the diode D1 and then charges the capacitor C2 U2 U3 and U1B are all voltage comparators the reverse of the voltage comparator The input terminal is connected to the DC voltage rectified by the diode and the same direction input terminal of the voltage comparator is connected to the step by step rising voltage after the voltage division of the resistors R13 R22 It can be seen that the stronger the external volume the higher the output voltage of U1A When the voltage exceeds the same direction input terminal of a voltage comparator the voltage comparator outputs a low level and the corresponding LED lights up The higher the voltage the more LEDs that can be lit in order to intuitively reflect changes in the external volume In the circuit the adjustable resistor RP1 is used to adjust the magnification of U1A that is to adjust the sensitivity of the volume column Capacitors C2 and R3 form a delay circuit which can form a slow falling pattern on the volume column making the volume column look more Intuitive The power supply range from 5V 12V DC can work normally Package Included LabelNameSpecification QuantityD1SMD diode1N41481R3Chip resistor100K1C1 C2Chip capacitors1052U1integrated circuitLM3581U2 U3integrated circuitLM3392J1Power outletDC0051R1 R2Chip resistor4 7K2R14 R22Chip resistor4