张三叔

Wheel of Fortune

Overview

Working voltage: 3v-5v Circuit principle: The circuit is mainly composed 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 C1. As the voltage at both ends of C1 decreases, the conduction program of Q1 gradually weakens, the frequency of the output pulse of pin 3 slows down, and the LED moving frequency also decreases. Slow down. Finally, when C1 is discharged. Q1 cuts 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 C1 determines the waiting time for the "lottery draw".

Design Files

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Update:2025-05-08 20:53:05

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