多谐振荡器Electronic circuit paper (memorial day digital display circuit)（电子线路论文(纪念日数显电路)）

Electronic circuit paper (memorial daydigital display circuit)

电子线路论文(纪念日数显电路) 

This paper consists of the boy with Guo

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JIU JIANG UNIVERSITY

Course design of electronic circuit

Title, English title, memorial day digital display circuit,Digital, device, circuit, anniversary, Electronic EngineeringInstitute, communications engineering * * * A0811/** * * * *

* * * * * * * * * * * * * * * * * * * * * *

Department professional name, class number, tutor

June 2010

Course design of electronic circuitpickwant

This design using the most knowledge base of digital electronictechnology, multivibrator composed of NE555 generation ofrectangular pulse, CD4017 decimal counter receives a pulse

signal, latch, decoding drive CD4511 drive digital tube. Theswitching transistor through the lfyback switch in saturation,cut-off (open, close) , fire control and the current pulseon-off.

Key words: digital display, pulse, decode, counter

One

Course design of electronic circuitorderrecord

The first chapter is the significance and purpose of thedesign. . . . . . 3, second chapters, principles, knowledge. . . . . .

3. . . . . . 2. 1, 2. 2, 2. 3, 2.4, 2.5, 2.6, 2.7, third chapters. . . . . .A multivibrator consisting of 3 NE555. . . . . . 4 decimal numberdecoder CD4017. . . . . . 5 1N4148 glass sealed silicon diode. . . . . .5 display decoder CD4511 pin diagram and function. . . . . . 5 LEDdigital tube. . . . . . 6 four 2 INPUT NAND gate CD4011. . . . . . 7. . . . . .The application of EDA technology. . . . . . Seven

3. 1 Protel drawing fundamentals. . . . . . 73. 2 simulation softwareproteus7.5. . . . . . 7. . . . . . The fourth chapter assemblywelding. . . . . . 74. 1 component list. . . . . . 84.2 welding. . . . . . 7,fifth chapter test, debug and test result. . . . . . 8. . . . . . Thesixth chapter is the conclusion. . . . . . 9. . . . . . References. . . . . .Nine

Two

Course design of electronic circuit

The significance and purpose of the design, the significanceand purpose of the first chapter

Memorial Day circuit digital display device is a digitalcountdown display circuit, the anniversary of the date and timeset for today. Now the countdown from August 8, 2008 with 69days, design a circuit repeatedly display more information. Thedisplay methods include: three digital tube, one digital tubedisplay 20088.8 side by side under repeated; the digital tubeplaced in the other two digital tube, the two digital tubedisplay 69 repeatedly, each rhythm represented in forms asfollows: each small square for a time (about one second) , thebox according to the specified content display, where the blanklattice said the rhythm without any display. 20088.8200

88.8. . . . . .

Sixty-nine

Sixty-nine

Sixty-nine

Sixty-nine

Sixty-nine

. . . . . .

Requirements: 1, output DC power supply with green emitting twotube instructions; oscillator output with a red light emittingdiode.2, each"69" display time shall not be less than 4beats,nor more than 6 beats and the beginning of each display "69"must be followed in a digital tube". . . . . . 8.8 "appear behind,must not misplace. "

The second chapter, principle knowledge

2. 1 circuit working principle

NE555 oscillator and its surrounding components to produce arectangular pulse, the input to the CD4017. CD4017 Qo decimalcounting distributor Q9 sequentially outputs a pulse count,including Q0, Q3, Q5, Q7 output by the diode D5, D6, D7, D8 sevenBCD- delivered to the latch / decoding / driver drive digitaltube CD4511, .Q1, Q2 but then, Q4, Q6, Q8, Q9 output by the diodeD4, D3, D2, D1 to the transistorVT, and then the 4 foot VT CD4511collector input to.Q7 output pulse, forming another pathcorresponding to the corresponding pulse elimination R11 litdigital tube decimal point DP, so there is a"20088.8" the otherway. The output of Q9 transmission to 4011 by reverse phasedelayandthenreverse to thebase of atriode, as the conductioncontrol signal. When the high level output, triode, two digitaltube display below the "69" and the number of seconds delay.Three

Course design of electronic circuit

Schematic diagram

R3

100K

R1

470R

U1 R2

2k2

Q1

NPN

7126345

A, B, C, D, LT, BI, LE/STB, 74HC4511

D1

LED

QA, QB, QC, QD, QE, QF, QG

1312111091514

D7 U3

8, 1N4148, Q0, Q 1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, , Q9, CO, 324710156,t wo

U2

Q DC 37

1413

CLK E

R4

56K

D3

1 N4148

D4

1 N4148

D5

1 N4148

VCC

4

D6, D8 1N41481 N4148

Q2

NPN

R

RV1

5 HP

R6

470r

G ND

15 th 6

2 100K

1 510r NE5554017 1N4148

11

TR

R5

Mr.

D9

D10

1 N4148 12 13

U5: D

4011

C1

10u

C2

10N

D2

LED 8 9 6 10 4011 1N4148 4011 4011

U5: C

5

U5: B

4

D11

U5:

1 2 3

C3

4u7

R7

470r

R8

470r

R9

470r

2.2组成的多谐振荡器NE555

组成的多谐振荡器可以用作各种时钟脉冲发生器555,如图所示;图中为脉冲频率可调的矩形脉冲发生器,改变电容C4可获得时