The welded voice-activated crystal column has 10-segment crystal column spectrum lights, which have voice-activated functions, precise rhythm, and dazzling colors. Through the microphone sensor, the LED lights fluctuate with the volume and rhythm of the music, especially at night. Full of action. The product has long-time animation, multiple audio effects, sensitivity adjustment and other functions, which are full of fun and are very suitable for electronic enthusiasts.
Product parameters：
Product model: TJ-56-143
Working voltage: DC 5~12V (DC power interface)
Circuit board: 29*146mm
Shell: 29*146*36mm
Features:
1. Long-time animation and various audio effects
2. Adjustable sensitivity, strong flexibility
3. Guaranteed quality, exquisite PCB board
Product principle:
The audio signal picked up by the microphone MK1 is coupled to the operational amplifier U1A by C1 for voltage amplification. The amplified audio signal is rectified by the diode D1 and then charged to the capacitor C2. U2, U3, and U1B are all voltage comparators, and the reverse of the voltage comparator The input terminal is connected with the direct current voltage rectified by the diode, and the same direction input terminal of the voltage comparator is sequentially connected with the step-by-step rising voltage after being divided by 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-inverting 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 LED can be lit, so as to intuitively reflect the external volume change. 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.
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