gateElectronic circuit paper (memorial day digital circuit)

Electronic circuit paper (memorial day digital circuit)This article is contributed by the children of the childrenDoc documents may have a poor browsing experience at the WAPend. It is recommended that you choose TXT, or download thesource file to the native view.

JIU JIANG UNIVERSITY

Electronic circuit course design paper

TheDigital device circuit, Digital device circuit, electronicengineering college, electronic engineering college

The school is a teacher with the name of the class

June 2010

Electronic circuit course design paperpickto

Most of this design using the digital electronic technologybasic knowledge, using NE555 multivibrator composed ofrectangular pulse impact, decimal counter CD4017 receives thepulse signal, latches, decoding, drive CD4511 control digitaltube. Switch triode through his work makes the switch tube insaturated excitation type, as (that is open, close) status,control the generation of blanking and electrical current.

Keywords: digital display, pulse, decoding, counterone

Electronic circuit course design paper

Orders,record

Chapter 1 the meaning and purpose of design. . . Chapter 2principles. . . 3. . . 2. 1 2. 2 2.3

2.2.2.2.2. 2.2.2. 2.2.2.2.2.2. 2.2.2. 2. 2.2.2.2.2.2. 2.2.2. 2.2.2. 2.2.2. 2.2.2.2. The three-ne555 multivibrator. . . The decimalnumber decoder CD4017. . . 5 1N4148 bo-sealed silicon diode. . .Display decoder CD4511 pins and functions. . . 5 LED digitaltubes. . . 6, 4, 2 input and non-gate CD4011. . . 7. . . EDA' s useof. . . 7

The foundation of Protel pictorial. . . 7 3. 2 softwareproteus7.5. . . 7. . . Chapter 4 assembly welding. . . The list ofcomponents. . . 8 4.2 welding. . . Chapter 5 test debugging andtest results. . . 8. . . Chapter 6 summarizes. . . 9. . . Reference. . .

9

2

Electronic circuit course design paper

The meaning and purpose of design in chapter 1

Anniversary of the digital display device is a countdowndisplay circuit, display anniversary. (date) (month) (year)and now the countdown set today as from August 8, 2008 days,69 days left to design a circuit according to the aboveinformation repeatedly. Display method: adopt three digitaltube, one of the digital tube display repeatedly 2008 8.8; Thelower part of the digital tube placed side by side the othertwo digital tube, the two digital tube display 69 repeatedly,each work beat expressed in the form as follows: each a smallbox for a beat (about one second) , box, according to specifiedblank said that beat without any display. 2 0 0 8 8. 2 0 0 88 8 August. . .

69

69

69

69

69

. . .

Requirement: 1, the power supply output is indicated by thegreen light secondary tube. Oscillator output leds indicate inred. 2, and each time the "69" show time should not be less than4 beats, every time not more than six beats and also began toshow the "69" must be followed in a digital tube behind ". . .

8.8 "appear, may not be misplaced.

Chapter 2 knowledge of principle

The principle of circuit 2. 1

NE555 and surrounding components of rectangular pulseoscillator, the input to decimal counting distributor CD4017.The CD4017 Qo- Q9, in turn, the output count pulse, includingQ0, Q3 and Q5, Q7 output via diodes D5, D6, D7, D8 to BCD -sevensegment latch/decoder/driver CD4511, digital tube driver. Q1and Q2 is not external, Q4, Q6, Q8, Q9 output diode D4, D3, D2and D1 to transistor VT, then through the VT collector to loseto CD4511 4 feet, the formation of the corresponding blanking.The other path output Q7 R11 let corresponding pulse lightdigital tube decimal DP, so there are "2008 8.8". Output Q9another lost all the way to 4011 by reverse phase delay phaseback to transistor base, as a control signal conduction. Whenfor high level output, triode conduction, the bottom of the twodigital tube display "6, 9" and delay for a few seconds.

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Electronic circuit course design paper

Schematic diagram

R3

100 k.

R1

470 r

U1 R2

2 k2

Q1

NPN

7, 1, 2, 6, 3, 4, 5

A B C D LT BI LE/STB 74HC4511

D1

The LED

QA QD QD QG

13, 12, 11, 11, 10, 9, 15, 14

D7 U3

81n4148 Q0 Q1 Q2 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q5 Q4 Q4 Q4 Q4 Q4Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4 Q4Q4 q

U2

Q DC 3 7

14 13

CLK E

R4

56 k

D3

1 n4148

D4

1 n4148

D5

1 n4148

VCC

4

D6 D8 1 n41481 n4148

Q2

NPN

R

RV1

5 CV

R6

470 r

G ND

15 TH June

2 100 k

510 r 1 NE5554017 1 n4148

11

The TR

R5

先生

D9

D10

1 n4148 12 13

U5: D

4011

C1

10 u

C2

10 n

D2

LED 8, 10, 9, 4011, 6, 1N4148, 4011, 4011

U5: C

5

U5: B

4

D11

U5: A

1 2 3

C3

4 u7

R7

470 r

The R8

470 r

R9

470 r

2.2 NE555 multivibrator

A multivibrator consisting of 555 can be used as a variety ofclock pulse generators, as shown in the figure. Diagram for thepulse frequency adjustable rectangular pulse generator, changethe electric capacity of C4 can obtain low frequency pulse, fora longer time to adjust potentiometer RV2 any frequency of pulsesignal can be obtained, such as pulse, 1 KHZ, 10 KHZ, etc. Asa result of the capacitor C4 to charge and discharge circuit