Ee2 chapter15 multivibrator
Upcoming SlideShare
Loading in...5
×
 

Ee2 chapter15 multivibrator

on

  • 1,531 views

 

Statistics

Views

Total Views
1,531
Views on SlideShare
1,531
Embed Views
0

Actions

Likes
0
Downloads
71
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Ee2 chapter15 multivibrator Ee2 chapter15 multivibrator Presentation Transcript

  • IT2001PAEngineering Essentials (2/2)Chapter 15 - Multivibrator Lecturer Namelecturer_email@ite.edu.sg Nov 20, 2012Contact Number
  • Chapter 15 - MultivibratorLesson ObjectivesUpon completion of this topic, you should be able to: Explain and demonstrate the function of IC555 in a timer circuit. IT2001PA Engineering Essentials (2/2) 2
  • Chapter 15 - MultivibratorSpecific Objectives Students should be able to :  Describe the characteristics of the 3 basic types of multivibrator :  Astable (free running)  Monostable (one shot) and  Bistable (flip flop)  State their applications.  Identify the IC 555 package.  Identify the following pin functions of the IC 555 :  Trigger (Pin 2), Threshold (Pin 6), Control voltage (Pin 5), Discharge (Pin 7), Output (Pin 3) and Reset (Pin 4) IT2001PA Engineering Essentials (2/2)
  • Chapter 15 - MultivibratorMultivibrator  A multivibrator is a circuit whose outputs are bistate.  The output may be either a Low or High.  Multivibrators can be divided into three groups: - Astable multivibrator (Free-running) - Monostable multivibrator (One shot) - Bistable multivibrator (Flip-Flop) IT2001PA Engineering Essentials (2/2) 4
  • Chapter 15 - MultivibratorAstable Multivibrator Free-running oscillator that O/P ASTABLE outputs a rectangular wave and requires no trigger input.INPUT NO INPUTOUTPUT E.g.: as oscillators, square-wave generators. IT2001PA Engineering Essentials (2/2) 5
  • Chapter 15 - Multivibrator Bistable Multivibrator I/P O/P BISTABLE Has two stable states and will • stay in either one indefinitely.INPUTOUTPUT E.g.: as digital storage register. IT2001PA Engineering Essentials (2/2) 6
  • Chapter 15 - MultivibratorMono Stable Multivibrator I/P O/P MONO STABLE Stable in only one of two voltage levels.INPUT E.g.: as a timer.OUTPUT IT2001PA Engineering Essentials (2/2) 7
  • Chapter 15 - Multivibrator555 IC Timer Two modes of operation; i.e. : • Astable (free-running) multivibrator • Monostable (one-shot) multivibrator. IT2001PA Engineering Essentials (2/2) 8
  • Chapter 15 - MultivibratorFree-running multivibrator 555 Vo Output High Free- Vo Vcc Output Low running mode Output wave form Output oscillators between high and low. The frequency of which is determined by • an external resistor-capacitor network. IT2001PA Engineering Essentials (2/2) 9
  • Chapter 15 - Multivibrator One-shot MultivibratorEi Negative-going Vo Time outputby the is is high determined trigger pulse Ei 555 Vcc circuit, not input pulse One-shot mode Vo 0 A t t 0 A Output wave formOutput voltage is low until a• negative-going trigger pulse is applied to the timer. • Then output switches to high. IT2001PA Engineering Essentials (2/2) 10
  • Chapter 15 - Multivibrator555 Pin Connection Trigger (Pin 2) 1 8 Threshold (Pin 6) R 2 Q1 7 Control voltage (Pin 5) R FF Discharge (Pin 7) S 3 R 6 Output (Pin 3) R Reset (Pin 4) 4 Q2 Ref 5 IT2001PA Engineering Essentials (2/2) 11
  • Chapter 15 - MultivibratorNext Lesson IT2001PA Engineering Essentials (2/2) 12