Study of Different types of Non-Inverting Amplifier




International Islamic University Chittagong
Department of Electrical & Electronics Engineering
Permanent Campus, Kumira, Chittagong.
 
Course Code: EEE-2404
Course Title: Electronics II Sessional
 
 
Experiment No: 01
Experiment Name:  To Study different types of Non-inverting Detector.
Objective: The objective of this experiment is:
01.  To know when a signal or voltage to be monitored is going to a predefined voltage level.
02.  To study how we can control the output voltage by controlling the power supply.
Theory:
Zero-Crossing Detector: A zero crossing detector is an electronic circuit that consists of an operational amplifier with an input voltage at its positive input terminal.
For non-inverting zero crossing detector when the input voltage is positive, the output voltage is a positive value, when the input voltage is negative; the output voltage is a negative value.
Positive Detector: In Fig-02 a positive reference voltage Vref is applied to one of the op amp’s inputs. This means that the op amp is set up as a comparator to detect a positive voltage.
If the voltage to be sensed, Ei, is applied to the op amp’s (+) input, the result is a non inverting positive-level detector. When Ei is above Vref, Vo equals +Vsat. When Ei is below Vref, Vo equals  –Vsat.
Negative Detector: Figure-03 is a non inverting negative-level detector. This circuit detects when input signal Ei crosses the negative voltage –Vref. When Ei is above –Vref, Vo Equals +Vsat. When Ei is below –Vref, Vo equals –Vsat.
The magnitude of the output voltage is a property of the operational amplifier and its power supply. When used with a ±15 V power supply and a 741C/OPA620 operational amplifier, Vsat+ is approximately 13.6 V and Vsat- is approximately -14.3 V.

Apparatus:
01.   Trainer Board
02.   OP-AMP (741)
03.   Resistance 1k
04.   Oscilloscope
05.   DC Source






Circuit Diagram:
Non-Inverting Detector

Wave shapes

Non-Inverting Zero Crossing Detector Circuit.jpg
Fig.-01: Zero Crossing Detector
Non-Inverting Zero Crossing Detector wave shapes.jpg

Non-Inverting Positive Detector Circuit.jpg
Fig.-02: Positive Detector
Non-Inverting Positive Detector Wave shapes.jpg

Non-Inverting Negative Detector Circuit.jpg
Fig.-03: Negative Detector
Non-Inverting Negative Detector Waveshapes.jpg

 
 
 
 
 
Procedure:
01.   Implement the Circuit as shown in above figure-01.
02.   Apply the supply voltages as +15v and -15v at pin no. 7 and 4 respectively.
03.   Apply a sinusoidal waveform of 10v p-p in the input. Observe the output.
04.   Change the waveform and observe the output.
05.   Implement the Circuit in fig-02. Connect a 5v dc at pin 2.
06.   Repeat step 2, 3 and 4 respectively.
07.   Implement the Circuit in fig-03. Connect a -5v dc at pin 2.
08.   Repeat step 2, 3 and 4 respectively.
Report:
01.   Draw the input and output waveform for different op-amp detector.
02.   Discuss the application of such type’s circuit in practical field.
References:
01.   Operational Amplifiers and linear integrated circuit by Robert F. Coughlin & Frederick F. Driscoll.


Submitted By:
Mohammad Jalal Uddin
ET-093024, Sec-A
Sem-4th, Dept.: EEE
IIUC (PC).