Download Astable Multivibrator using BJT.epb


To design and simulate an Astable Multivibrator circuit.

Components Required

Transistor - BC107A (2), Resistor - RC05 (4), Capacitor – CC0805 (2), DC voltage source – VDC (1), Ground - SPL0 (1)

Circuit Diagram


1. Draw the circuit diagram after loading components from library. Assign net names for connections wherever necessary. Preprocess the circuit by invoking Simulation → Preprocess.
2. Place waveform markers on the output nodes. 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.

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

        Transistors : BC107A (2) (Click on the Set up Model of the Model Type. Click on Accept to get the default values assigned)
        Resistors: 1k (2), 4.7k (2)
       Capacitor : 4.7µF (2)
        VDC/1 : 6V

3. For setting up simulation time and analysis types, select Simulation menu, choose Analysis. In the window pops up, select DC Transfer function analysis from tree view.
Enter following values:
        Step : 100m
        Final time : 100m
        Results : Select Waveform from drop down menu.

4. 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.