10PCS Lucky Rotary Suite Electronic CD4017 NE555 Self DIY LED Light Kits Production Parts And Components 3-5V | Электронные

10PCS Lucky Rotary Suite Electronic CD4017 NE555 Self DIY LED Light Kits Production Parts And Components 3-5V | Электронные

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Electronic Lucky Turntable

Function: The Lucky Turner is a tool that first predicts where the disc will stop when it stops. Can also be used as an estimate number game, electronic dice, lottery machine, etc. The electronic lucky turntable achieves the same function electronically. This kit configures 10 LEDs into a circle. When the button is pressed, each LED rotates in sequence. At the beginning, the flow speed is very fast. It looks like all the LEDs. As if all flashing together, the flow speed will be slower and slower, and finally stop moving on a certain LED. If the last LED is the same as the player predicted, it means "winning".

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. The multi-vibrator is composed. When the button S1 is pressed, Q1 is turned on, and the NE555's 3 pins output pulses. The 10 outputs of the CD4017 alternately output high-level driving 10 LEDs to rotate. After releasing the button, Q1 will not be cut off immediately due to the presence of capacitor C2. As the voltage across C2 decreases, the conduction procedure of Q1 gradually weakens, the frequency of the output pulse of 3 pin becomes slower, and the frequency of LED movement also follows. Slow down. Finally, when the C2 discharge is over. When Q1 is cut off, the NE555's 3 feet no longer output pulses, and the LED stops moving. A "winning" process was completed. R2 determines the speed of LED movement, and C1 decides the time to wait for the "winning". Schematic:

Component list:

common problem:

1. Resistance welding error, pay attention to the logo on the board, two are 470K, one is 10K. 2. The capacity of the electrolytic capacitor and the positive and negative poles are not noticed, a 47uf, a 1uf, long positive pole. 3.1N4007 direction welding reverse, there is a white side corresponding to the side of the board with a horizontal bar. 4. The chip is inserted in the reverse direction. Note that the chip gap corresponds to the direction of the notch on the board. 5. LED positive and negative, long foot positive. 6. The power supply is reversed, VCC is connected to the positive pole, GND is connected to the negative pole, and the power supply voltage is 3-6V DC voltage. Appendix: Specific identification methods for four-ring and five-ring color ring resistors.

Electronic Lucky Turntable