NE556 查看數據表（PDF） - STMicroelectronics

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比赛名单

NE556

General-purpose dual bipolar timers

STMicroelectronics 

NE556 - SA556 - SE556

Application information

Figure 14. Tone burst generator

Reset 4

Vcc

Rt

Trigger

Trigger

6

Discharge

1

1/2

NE556

SE556

2

Threshold

C1

Ground

14

5

Output

Control

3

0.01mF

T = 1.1 R t .C1

10

Reset

Output

9

14

1/2

NE556

SE556

+15V

RA

Discharge

13

RB

12 Threshold

8 Trigger

11 Control

Ground 0.01mF

C2

1.44

f=

R A + 2RB ) C

Ground

For a tone burst generator the first timer is used as a monostable and determines the tone

duration when triggered by a positive pulse at pin 6. The second timer is enabled by the high

output or the monostable. It is connected as an astable and determines the frequency of the

tone.

Figure 15. Monostable operation

VCC

RL

RA

4

14

Trigger

(10)

6 (8)

1/2

NE556

SE556

(13) 1

Output

RL

5 (9)

7

(12)

2

(11)

3

10nF

C

T = 1.1 R A .C

9/16

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