Taidacent CD4017 Educational Electronics Kit Voice activated LED Light Part Colorful Light Control Kit Learn to Solder Kit

Circuit function

10 LEDs emit light with the sound size and high and low circulating water circulation. The louder the sound, the faster the water
flow speed. The L11 flashes once every cycle, which can fully display the function of 4017.

Working voltage

3-5V can be, the higher the voltage, the brighter the LED will be.

Circuit principle

Q1 and its peripheral circuits form a simple circuit. The MIC converts the sound signal into an electrical signal, which is coupled to Q1 for amplification by C3, and forms a high and low voltage signal at the collector of Q1. The voltage of sufficient amplitude is sent to CD4017. Counting the input terminal (14 feet), every time a pulse is received, the high level of the Q0-9 output of the counter is sequentially shifted by 1 bit to illuminate the corresponding LED, thereby generating a feeling of running water. L11 is connected to the 4017 count output terminal CO. When L1-5 is lit, the CO end of 4017 outputs a high level and lights up L11. When L6-10 is lit, the CO end outputs a low level, and L11 does not light. If you think that L11 is unsightly, you can also install it without affecting the circuit.