Electronic Lucky Wheel Kit Assembly Board

Product Description

Supply voltage: 3.5-6V DC
LED type: 5MM red LED
Core chip: NE555+CD4017
Dimensions: 4.8*5.1cm

Principle:
The circuit is mainly composed of a pulse generator and a decimal counter circuit. The pulse generator is composed of NE555 and peripheral components to form a multivibrator. When the button S1 is pressed, Q1 is turned on, and the 3-pin of NE555 outputs a pulse, then the 10 output terminals of CD4017 output high level in turn to drive 10 LEDs to emit light in turn. After releasing the button, due to the existence of capacitor C2, Q1 will not be cut off immediately. As the voltage across C2 decreases, the conduction process of Q1 gradually weakens, and the frequency of the output pulse at pin 3 slows down. The LED moving frequency also follows. Slow down. After the discharge of C2 ends, Q1 stops outputting pulses to pin 3 of NE555, and the LED stops moving. A "lottery draw" process is thus completed. R2 determines the LED moving speed, and C2 determines the waiting time for "lottery draw" .

Use suggestions:
1. The resistance cannot be soldered wrong, pay attention to the logo on the board, two are 470K, and one is 10K.
2. Pay attention to the capacitance value and positive and negative electrodes of electrolytic capacitors, one is 47uf, one is 1uf, and the positive electrode of the long leg.
3. 1N4007 should not be soldered in the opposite direction, the side with white corresponds to the side with the horizontal bar on the board.
4. The chip cannot be inserted backwards. Note that the chip notch corresponds to the direction of the marked notch on the board. 5. LED positive and negative poles, long feet positive pole.
6. The power supply cannot be reversed, and the power supply voltage should be 3-6V DC voltage.