Lucky wheel lottery DIY production electronic 555 production

The circuit mainly consists of a pulse generator and a decimal counter circuit. The pulse generator consists of NE555 and peripheral components to form a multivibrator.

When button S1 is pressed, Q1 is turned on, pin 3 of NE555 outputs pulses, and the 10 output terminals of CD4017 take turns outputting high levels to drive 10 LEDs to emit light in turn. After releasing the button, Q1 will not cut off immediately due to the presence of capacitor C2. As the voltage at both ends of C2 decreases, the conduction program of Q1 gradually weakens, and the frequency of the output pulse of pin 3 slows down, and the LED moving frequency also changes. slow. Finally, when C2 is discharged, Q1 is cut off, pin 3 of NE555 no longer outputs pulses, and the LED stops moving. This is how the "lottery drawing" process is completed.

R2 determines the LED moving speed, and C2 determines the waiting time for the "lottery draw".

Product parameters

■Power supply voltage: 3.5-6V DC

■LED type: 5MM red hair red L.ED

■Core chip: NE555+CD4017

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