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Operating Introduction:
1. When INPUT port hasn't input voltage, that is when A-B/C-D both disconnect, VIN is connected, CD4511 2-pin, 4-pin are low level;
since IC1 the fourth pin is blanking input control port; when BI=0,no matter what other input ports' state are, its output port A-G are all 0; and 7 segment digital tube are all off and not display number.
2. When INPUT port inputs low level which is lower than 0.47V, that is short circuit INPUT C-D port,
VT1 cut off, and its collector output high level;IC1 BCD code input DCBA=0100, after decoding,
IC1 output port B/C/F/E is high level, and others are low level. So digital tube display "L" representing logic low level.
3. INPUT port input 3.13-5V high level, that is short circuit INPUT A-B port, VT1 is connected;
its base and collector are both high level, IC1 BCD code input DCBA=0110; after decoding, IC1 output port A/C/D/E/F/G output high level; and others are low level;digital tube display "H" representing logic high level.
Packing List:
| NO. | Component Name | PCB Maker | Parameter | Quantity |
| 1 | Resistor | R1 | 2K ohm | 1 |
| 2 | Resistor | R2,R3 | 1M ohm | 2 |
| 3 | Resistor | R4 | 120K ohm | 1 |
| 4 | Resistor | R5 | 1K ohm | 1 |
| 5 | Resistor | R6 | 10K ohm | 1 |
| 6 | Resistor | R7 | 51 ohm | 1 |
| 7 | Triode | VT1,VT2 | 9014 | 2 |
| 8 | Diode | VD1 | 1N4148 | 1 |
| 9 | Ceramic Capacitor | C1 | 220pF | 1 |
| 10 | Electrolytic Capacitor | C2 | 10uF | 1 |
| 11 | Ceramic Capacitor | C3 | 0.047uF | 1 |
| 12 | LED | LED1 | 5MM Red | 1 |
| 13 | 1-Bit Digital Tube | LED2 | Common Cathode | 1 |
| 14 | Single Pin | Input | 4P | 1 |
| 15 | IC | U1 | CD4511 | 1 |
| 16 | Short Circuit Cap | 1 | ||
| 17 | Wire | 2 | ||
| 18 | PCB | 1 |
Finished Product Picture:
Circuit Picture:
Tested by ICStation's Outstanding Partner bzoli5706:
The digital tube display "L" indicates logic Low level.
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The digital tube display "H" indicates logic High level.
Learn More Details in the Video:
| Quantity | 3+ | 5+ | 10+ |
| Price | $1.99 | $1.85 | $1.70 |
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