Rewritable electronic lottery drawer ten-way LED game water lamp lucky turntable technical school DIY production kit circuit mainly comprises a pulse generator composed of NE555 and a decimal counter composed of a CD4017. When the switch is pressed, the 3-pin of NE555 outputs a pulse. Trigger CD4017 to make 10 output terminals output high level in turn to drive 10 LEDs to emit light in turn. After releasing the button, Q1 will not be cut off immediately due to the existence of capacitor C1. As the voltage at both ends of C1 drops, the conduction of Q1 The pass degree gradually weakens, so the pulse frequency slows down, and the LED cycle speed slows down until it stops at a certain position. In the circuit, C1 (47uf) controls the delay time and C2 (1uf) controls the cycle speed;
Product parameters:
Circuit board size: round, 80mm in diameter;
Working voltage: DC 5V, it is very convenient to use the mobile phone TYPEC interface to supply power;
Application occasions: college training, youth fun production, game entertainment, etc.;
Working principle:
The lucky turntable is an entertainment toy that first predicts where the rotating LED will stop. 10 LEDs simulate lucky prizes. After pressing the start button, the LED lights up and cycles quickly. As the cycle speed becomes slower and slower, and finally stops at a specific LED at random, indicating that the contestant has won the prize or the corresponding thing to do;
Precautions:
Please use a water pen to write to facilitate erasing and rewriting; if oily writing, please use alcohol to erase;
Component location diagram:
Circuit diagram:
Component identification method:
| NO. | Name | Specification | Quantity | Recognition methods |
| 1 | Resistance | 100R five rings 1/4W | 1 | brown black black black brown |
| 2 | 10K five rings 1/4W | 1 | brown black black red brown | |
| 3 | 470K five rings 1/4W | 2 | yellow purple black orange brown | |
| 4 | Electrolytic capacitor | 1uF/25V | 1 | long positive, short negative |
| 5 | 47uF/25V5*7 | 1 | ||
| 6 | LED | 5mm red hair red | 10 | Long positive and short negative, the gap is negative |
| 7 | Switch | tact switch | 1 | Recognition by shape |
| 8 | Power base | TYPEC pin type | 1 | |
| 9 | Triode | 9013 | 1 | |
| 10 | Integrated circuit | NE555 | 1 | Identify by gap |
| 11 | CD4017 | 1 |
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