op amp applications

1. OPERATIONAL
AMPLIFIERS
APPLICATIONS
•OP-AMP Applications: Basic Op-Amp circuit, inverting
Schmitt trigger circuit, Active Filters –First and second
order Low pass & High pass filters, Voltage regulators,
Series Op-Amp regulator, IC Voltage regulators, 723
general purpose regulator (Text 2: 1.2, 9.3, 11.2, 11.3,
11.4, 11.5 Text 3: 6.2, 6.3, 6.4)

2. BASIC OPERATIONAL AMPLIFIER CIRCUIT SYMBOL

3. OP-AMP CIRCUIT

4. OP-AMP SWITCHING APPLICATIONS

5. INVERTING SCHMITT TRIGGER CIRCUIT

6. INPUT OUTPUT WAVEFORM OF SCHIMITT TRIGGER

7. HYSTERESIS

8. INPUT/OUTPUTCHARECTERISTICS FOR AN INVERTING
SCHMITT TRIGGER CIRCUIT

9. ADJUSTING TRIGGERING POINTS

10. FILTERS

11. ORDER OF THE FILTER

12. DIFFERENT APPROACHES TO THE DESIGN OF ACTIVE
FILTERS

13. FIRST ORDER ACTIVE LOW PASS FILTER

15. FIRST ORDER ACTIVE HIGH PASS FILTER

16. FIRST ORDER ACTIVE HIGH PASS FILTER

17. SECOND ORDER ACTIVE LOW PASS FILTER

19. SECOND ORDER ACTIVE HIGH PASS FILTER

21. VOLTAGE REGULATORS

22. •Feedback is given to negative input terminal.
•As output voltage increases , sampled voltage
also increases , inturn reduces vo’of difference
amplifier due to 180 degrees phase difference
provided by amplifier.
• Vo’ is applied to base of emitter follower and
hence vo is also reduced. Hence increase is
nullified.

23. FIXED VOLTAGE REGULATORS

24. CHARECTERISTICS OF FIXED VOLTAGE REGULATORS
1.Vo is fixed value by
manufacturer.
2.|vin|>- |vo|+2V
3.Io max: within rated maximum
current. Heat sinks are provided.
4.Thermal shutdown: builtin
sensors(125-150’C)

31. Low VOLTAGE REGULATORS