1. ELEC 101
Lab 6
Drawing Circuits

2. Lab 6 Objectives
• Identify Circuit connections and configuration
– Series Connections
– Parallel Connections
– The Series Circuit
– The Parallel Circuit
– The Series-Parallel Circuit
• Drawing Circuits
– Entering Components
– Rotating components
– Changing component values and labels
– Selecting and moving components or groups of components
February 2004 ELEC 101 - Lab 6

3. Lab 6
Circuit Configurations

4. The Series Circuit
• Single path from + terminal of source, through components, to – terminal
of the source
– Current is the same everywhere in the circuit
• There are 3 nodes in the circuit shown
• If a component is added in series
– Break the circuit where you wish to add the component
– Enter the component and wires as necessary to complete the circuit
– Each component added in series adds one more node
February 2004 ELEC 101 - Lab 6

5. The Parallel Circuit
• Multiple paths from + terminal of source, through components, to –
terminal of the source
– Current in each branch depends on value of branch resistance
• There are 2 nodes in the circuit shown
• If a component is added in parallel
– Enter the component in parallel where desired
– Add wires as necessary to complete the circuit
– When a component is added in parallel does not create a new node
February 2004 ELEC 101 - Lab 6

6. The Series-Parallel Circuit
• R1 and R3 are in series
• The series combination of R1 and R3 is in Parallel with R2
February 2004 ELEC 101 - Lab 6

7. The Series-Parallel Circuit
• R2 and R3 are in Parallel
• The Parallel combination of R2 and R3 is in series with R1
February 2004 ELEC 101 - Lab 6

8. Lab 6A
Components Used in this Lab

9. VDC- The DC Voltage Source
Insert Anode, the + terminal up. Usually, the – terminal will be grounded
February 2004 ELEC 101 - Lab 6

10. VDC – Battery or DC Voltage Source
• Orientation is significant
• Two Terminals
– Anode
– Cathode
• Enter component according to instructions or polarity of output will be reversed and
considered incorrect
• You can change the Part Reference (VS above) and the Part Value (12VDC)
• DCL on the Reference or value and change in dialog box
• CL on Component and CR to open Property Editor
February 2004 ELEC 101 - Lab 6

11. Property Editor
• The Property Editor presents the part information in a spreadsheet format
• All values and part information about the selected part can be edited and displayed
or hidden
• More difficult than previous method to change values and part references since you
must find the right boxes and replace the current values
– the red arrows in the graphic above show where to change the component value and part
reference for the VDC source
• Usually requires horizontal scrolling
• There are easier ways to modify part values
February 2004 ELEC 101 - Lab 6

12. R - The Resistor
Orientation of resistors are not important – They are linear and bilateral
February 2004 ELEC 101 - Lab 6

13. GND/CAPSYM - Ground
Make sure you change the name is 0 or PSpice will generate
an error message when a simulation is attempted
February 2004 ELEC 101 - Lab 6

14. Lab 6A
Drawing a Series Circuit

15. Creating Schematics
• When drawing a schematic, it is most efficient if you
– Place Components
– Modify part values and part references if necessary
– Move the part references and part values if desired
– Move and realign components as necessary to create a
professional schematic
– Add wires
– Add at least 1 ground named 0
– Add one or more net alias if desired
February 2004 ELEC 101 - Lab 6

16. Lab 6A Schematic
<= Part Reference
<= Part Value
February 2004 ELEC 101 - Lab 6

17. Place Net Alias
February 2004 ELEC 101 - Lab 6

18. Circuit for Lab 6A
February 2004 ELEC 101 - Lab 6

19. Lab 6B
Drawing the Circuit

20. Drawing the Circuit
• Place the components at the desired location
• Modify the part values and part references as necessary
• Place wires to complete the circuit
• Place at least 1 ground named 0
• If necessary, place a Net Alias at desired nodes
February 2004 ELEC 101 - Lab 6

21. Place the Parts
February 2004 ELEC 101 - Lab 6

22. Modify Part References and Values
If desired, reposition the part references and values to make
the schematic neat.
February 2004 ELEC 101 - Lab 6

23. Lab 6B Final Circuit
February 2004 ELEC 101 - Lab 6

24. Lab 6C
Complex Circuits with Crossovers

25. New Parts Used in the Drawing

26. AC Sine Sources
February 2004 ELEC 101 - Lab 6

27. NPN Transistor
Q2N2222A Model Parameters
.model Q2N2222 NPN(Is=35f Xti=3 Eg=1.11 Vaf=100 Bf=250 Ne=1.5
+ Ise=1.2f Ikf=.1 Xtb=2 Br=6 Nc=2 Isc=.1f Ikr=1000 Rc=20
+ Cjc=20p Mjc=.33 Vjc=.75 Fc=.5 Cje=35p Mje=.33 Vje=.75
+ Tr=13n Tf=530p Itf=.6 Vtf=1.7 Xtf=3 Rb=100)
February 2004 ELEC 101 - Lab 6

28. Capacitor
February 2004 ELEC 101 - Lab 6

29. VCC Bar
February 2004 ELEC 101 - Lab 6

30. Two types of Crossovers
When you draw a wire that crosses over another, you must pay particular
attention at the junction so the schematic is drawn correctly.
The presence of a dot denotes a node
February 2004 ELEC 101 - Lab 6

31. Make sure there is no dot at the crossover
February 2004 ELEC 101 - Lab 6

32. Circuit for Lab 6C
February 2004 ELEC 101 - Lab 6

33. Modifying the Q1 Model
CL on Q1. CR and CL on Edit PSpice Model.
CL in right window of the Model Editor, press CTRL HOME
The cursor should move to the beginning of the model statement.
Type an asterisk followed by your last name.
February 2004 ELEC 101 - Lab 6

34. Circuits for Submission

35. Circuit for Lab 6A
February 2004 ELEC 101 - Lab 6

36. Circuit for Lab 6B
February 2004 ELEC 101 - Lab 6

37. Circuit for Lab 6C
February 2004 ELEC 101 - Lab 6

38. Model Statement for Lab 6C
*Your_Last_Name
.model Q2N2222 NPN(Is=35f Xti=3 Eg=1.11 Vaf=100 Bf=250 Ne=1.5
+ Ise=1.2f Ikf=.1 Xtb=2 Br=6 Nc=2 Isc=.1f Ikr=1000 Rc=20
+ Cjc=20p Mjc=.33 Vjc=.75 Fc=.5 Cje=35p Mje=.33 Vje=.75
+ Tr=13n Tf=530p Itf=.6 Vtf=1.7 Xtf=3 Rb=100)
* National pid=19 case=TO18
* 88-09-07 bam creation
February 2004 ELEC 101 - Lab 6