OPAMP ASYMMETRIC ASTABLE MULTIVIBRATOR
Aim
To simulate a opamp asymmetric astable multivibrator.
Components required
Opamp-741 (1), Resistor - RC05 (4),Diode - 1N4001(1), Capacitor-CC0805(1),
DC voltage source - VDC (2), Ground- SPL0 (2)
Circuit Diagram
Procedure
1.Draw the circuit diagram after loading components from library. Assign net
names for connections wherever necessary. Preprocess the circuit by invoking
Simulation --> Preprocess. Place waveform markers on input and output nodes.
2.For placing waveform markers, select Tools --> Instruments --> Set Wave Form
Contents --> Voltage waveform --> Click on the required net and place the
waveform marker. Run transient analysis after setting up required
parameters.
3.To proceed with the simulation, the steps are as follows
Select Tools --> Components --> Component properties-->
Change simulation parameters--> Click on the required component and change its
values.
The values to be provided to the components are
Opamp : 741 (Since it is a subcircuit,no parameter is to be assigned.)
Diode : 1N4001(Click on the Set up Model of the Model Type.Click on Accept to get the default values assigned
Resistors :10k(3),15k(1)
Capacitor :0.1µF(1)
VDC/1 : 15V
VDC/2 : 15V( Use -15V if the VDC is connected in normal mode.)
4.For setting up simulation time and analysis types, select Simulation
menu, choose Analysis. In the window pops up,select Transient
analysis from tree view.
Enter following values:
Step
: 1µ
Final time : 10m
Results
: Select Waveform from drop down menu.
5.Click on Accept. Expand the Transient Analysis and select
Waveform viewer, Select As Marked. Click on Accept. Select
Transient Analysis. Run Analysis by clicking on Run button.
Result
