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Description:
The three-person voter consists of a 3-8-bit decoder (74HC138) and two 4-input NAND gates (74HC20). User input is received through three buttons. Press the button to agree; press not to reject. When no one presses the button, or only one person presses the button, for example, S1 is pressed, but S2 and S3 are not pressed, the red light is on, the green light is off, and the buzzer is silent, indicating no. When two or more people press the button, for example, S1 and S2 are pressed, the red light is off, the green light is on, and the buzzer sounds to indicate passing.
Specification:
Power supply voltage: 4.5-5.0V (DC voltage)
Board size: 4.0 * 5.5cm
| Component name | Quantity | Component name | Quantity |
| Resistance 330Ω | 2 | 5mm Red LED | 1 |
| Resistance 2K | 1 | 5mm Green LED | 1 |
| Resistance 10K | 3 | 74HC138 in-line chip | 1 |
| Triode 9013 | 1 | 74HC20 in-line chip | 1 |
| Tap the button | 1 | 14P 1C | 1 |
| KF301-2P terminal block | 1 | 16P 1C | 1 |
| 5V active buzzer | 1 | PCB Board | 1 |
Package includes:
1 x Soldering Practice Parts
Soldering Practice Parts Board Electronic Components DIY Production Kit See detail
