【High quality material】 mainly composed of clock generation circuit and decimal counter circuit. Adjust R4 to adjust the flow rate of the LED light. 【Operation principle 1】 Self-excited multivibrator with NE555 as the core, the power supply charges the capacitor C1 through R2, R3, R4. When C1 starts charging, the 2 pin of NE555 is still low level, so the output pin 3 is high level. 【Operation principle 2】 When the power supply is charged to 2/3 of the power supply voltage through R2, R3, and R4, the output level of pin 3 changes from high to low, and the internal discharge tube of NE555 is turned on. Capacitor C1 discharges through R4, R3, and 7 feet of NE555. 【Operation principle 3】 until the voltage across C1 is lower than 1/3 of the power supply voltage, the level of pin 3 of NE555 changes from low level to high level. C1 is charged again and the cycle forms oscillations. 【The charging time is】 0.695 (R2+R3+R4) C1, the discharging time is: 0.695 (R4+R3) C1, the output frequency of the R4 control oscillator can be adjusted, and the clock oscillation signal is continuously added to the 14th pin of CD4017 by NE555.
EAN: 3418443125810
Manufacturer: mumisuto
Brand: mumisuto
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