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1992-03-18
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Schematic Plus Version 1.2
By Steve Poulsen
(c) 1992
Last revision: 18 MAR 1992
This is Shareware. It is not free. If you use it please
send suggested contribution of $20.00 to the address at the end of
these instructions.
DISCLAIMER
The author is not responsible for any errors caused by this
software. The user is responsible to compare the results with
another method when accuracy is a must.
Contents
page
1........Setup.............................................3
2........Toggles...........................................3
3........Building a Circuit................................4
3a.........Components......................................4
...........Resistor......................................4
...........Capacitor.....................................4
...........Inductor......................................4
...........Mutual Inductance.............................4
...........Voltage Source................................5
...........Current Source................................5
...........Controlled Sources............................5
3b.........Removal.........................................5
4........Loading a Circuit.................................5
5........Saving a Circuit..................................5
6........Pspice............................................6
7........Options...........................................7
7a.........Change Filename.................................7
7b.........New w...........................................7
7c.........Erase Circuit...................................7
7d.........Given Values....................................7
7e.........Solved Values...................................7
7f.........Pan Screen......................................7
7g.........Home Screen.....................................7
8..........Examples........................................7
9..........Sample Startups.................................8
10..........Configure.......................................8
11..........Shareware.......................................9
12..........Register Info..................................10
13..........Register Form..................................11
Page 3
SETUP
Setting up Schematic Plus is fairly easy. If you plan to use
Pspice or Probe with Schematic Plus, then it's best if you have
you Pspice directory in your path file. Probe will not work with-
out it there, but Pspice will if you use the start up switch on
Schematic Plus [/p].
Make sure all files are in one directory and type schem.
This will get you going. Schematic Plus should detect your
monitor type, but in the event it doesn't you can change schem.bat
to force a monochrome setting. Just add the toggle /m after the
line calling schemati.
TOGGLES
The following toggles are available:
/c Skip credits
/m Force monochrome
/p{path} Path where Pspice is found
/f{file} File to start up with
/d{path} Path where .sch files are found
/1 Force VGA mode
/2 Force EGA mode
/3 Force CGA mode [not worth it]
For toggles that require something after the letter, do not
put a space. Also, on the /p toggle the path's final character
must be a \. I highly recommend not using /p but changing your
dos path variable instead. The /d toggle shouldn't end in a \.
Page 4
BUILDING A CIRCUIT
Selecting this from the main menu will allow the building of
a circuit. Enter a positive value for w [omega] or a zero for DC.
Begin entering your components then press ESC to return to the
main menu.
COMPONENTS
RESISTOR
Upon selection of resistor, you will be prompted for a value.
All values entered are the standard value with no prefixes. If
you want to use a prefix, you may use the following:
n:nano 10E-9 u:micro 10E-6 m:milli 10E-3 k:kilo 10E+3
These may be used together. Only positive values will be
accepted. After pressing enter, you will be prompted for the
positive node. On a resistor this seems unnecessary, but it is
used when figuring currents. You will then be prompted for a
negative node.
When entering the nodes, at least one must be a node already
shown on the screen. The other may be a node already on the
screen also. If the other is to be a 'new' node, then you may
enter a period here.
After entering the nodes, Schematic Plus will ask you for a
direction. Schematic Plus will first look at your + node. If it
is a node already being used, the direction you chose will be from
this node. Only if your + node is not available, will your
direction be from the - node.
Schematic Plus will now begin to draw your resistor. It will
draw from the node decided by the above and draw in the direction
you entered. If both nodes were available already, then Schematic
Plus will finish by drawing a line from you - node to the end of
the new resistor.
CAPACITOR
A capacitor is entered using the same procedure as the
resistor. The value entered is in farads.
INDUCTOR
An inductor is entered using the same procedure as the
resistor. The value entered is in henrys.
MUTUAL INDUCTANCE
The mutual inductance value is the coupling coefficient and
is determined by the following formula:
Page 5
M
k = -------
√(L1∙L2)
You will then enter the number of the first and second
inductors to be coupled. They will be coupled according to the
dotted convention.
VOLTAGE SOURCE
First enter the value in volts. If w is greater than 0 [AC]
then you will be prompted for an angle. This is the phase angle
of the source and must be positive. To represent a negative phase
angle, just add 360 to the value and use the result. You will
then enter the + and - nodes as before.
CURRENT SOURCE
The current source is entered exactly as the voltage source.
The value is in amps.
DEPENDENT SOURCES
All controlled sources' value is the constant multiple that
is multiplied to the controlling source. After entering this for
voltage controlled, you will enter the + controlling node and the
- controlling node. This is the controlling voltage. For current
controlled, you will pick the type of component and then the
number of that component. The current that will control your
source is the current that flow from + to - through your chosen
controlling component. After picking the controlling component
you will then place the component by nodes and direction as
before.
REMOVAL
The removal of a component consists of picking the type of
component and its number. No nodes will be erased. If you don't
need the node, leave it. It will be ignored if no components are
connected to it.
LOADING A CIRCUIT
Select the file to load and if it is in your /d selected
subdirectory, then it will be loaded.
SAVING A CIRCUIT
Enter the file to save. If it exists already, you will be
prompted to overwrite. Once you enter a file name, the file name
prompt will be skipped. You may change the file name using the
options sub-menu.
Page 6
PSPICE
After your circuit is complete and correct, you may evaluate
using this selection, provided you have the Pspice software.
Pspice evaluation copy can be obtained free of charge from many
places. You can write me or leave me mail if you can't find it
and I'll give you a copy. Pspice will evaluate your circuit and
provide you with a voltage or current that you may specify.
Select Pspice. Schematic Plus will attempt to save your
file. If it already exists, it will prompt you to overwrite. You
will then be asked if you want to solve for specific voltages or
currents or [if your circuit is AC] view a transfer function plot.
The transfer function plot is obtained through a Pspice accessory
program called Probe.
If you select SOLVE, you will get to select a voltage or a
current to find. For voltages you will then have to supply the
two nodes where the unknown voltage is. For currents you will
supply the component type, then number in which the current flows
through. The current value you will receive will flow from the
positive node to the negative node. You may repeatedly supply
voltages and currents to solve for. When you're finished, select
[F3] to continue.
Next are the two ways to run Pspice. If your system has
enough memory, you may select Pspice from the menu and execute
Pspice internally. If you haven't the memory, select Exit[9]
which will work the same. You can try the internal method and if
you haven't enough memory, you will be told.
Pspice/Probe will be executed and an 'out' file will be
created. You must exit Schematic Plus to view the out file. This
out file will be the same name as your circuit only it will have
the extension .out . If you have any errors, they will be listed
here. If you have the registered version, you can view your
solved values without leaving Schematic Plus. Just select OPTIONS
from the main menu and select SOLVED VALUES. This will display
all the values you had asked for. Select GIVEN VALUES to return
to your component values. VM is voltage magnitude. VP is voltage
phase angle. IM is current magnitude. IP is current phase angle.
If you have the registered version, you may run Probe. Probe
will be automatically run if you select TRANSFER FUNCTION. You
will enter another value for w [omega]. Your first value you
entered will be your starting value and this new value will be
your ending value. When you use the Exit[9] selection, Pspice
will evaluate your circuit, then Probe will allow you to plot any
variables between these two frequencies.
Page 7
OPTIONS
CHANGE FILENAME
Just enter the new filename. You must save your circuit to
ensure the change.
NEW W
Enter the new value for omega. This is the omega for your
circuit, but if you plan to use the transfer function plot, this
will be your starting omega [angular frequency].
ERASE CIRCUIT
It does what it says with a Are You Sure? prompt.
GIVEN VALUES
If you have too many components and can't see all the values,
use this to view the next screen full. Also, use this to return
to your component values after viewing your solved values.
SOLVED VALUES
This displays your values you used Pspice to solve for you.
This is the main reason for using this software. If you have an
out file in your subdirectory, this will always work. It reads
the out file and scans for solved values.
PAN SCREEN
This allows you to scroll around the screen to view a part of
your circuit. Select this, thin use the control key along with
the following keys for different directions:
CTRL-S Pan circuit to the right. CTRL-A Pan circuit to the
left. CTRL-W Pan circuit upward. CTRL-Z Pan circuit downward.
You can add to a part of your circuit even though it is not
visible. Also, you may only build onto existing nodes. This I
plan to change.
HOME SCREEN
If you get lost while panning, select this to return to node
0. This is called your home screen and will always be where your
started your circuit.
EXAMPLES
There are three example circuits include called EXAMPLE1,
EXAMPLE2, and EXAMPLE3.
Page 8
SAMPLE STARTUPS
Start for VGA and .sch files are not in the current directory.
schemati /d/engineer/schemati/files /1
Skip credits and automatically load example1.sch
schemati /fexample1 /c
Force monochorome and pspice is in the \pseval50 directory.
schemati /p\pseval50\ /m
NOTE: Monitor type is automatically detected and all paths must
be on the current drive.
CONFIGURE SCHEMATIC PLUS
To configure Schematic Plus, use any text editor on the file
named SCHEMATI.INI . All is self explained except for graphic
drivers and modes. If you leave these at 0, then your driver
should automatically be detected. Otherwise use the startup up
toggles to switch modes.
Page 9
SHAREWARE
Shareware is 'try before you buy' software. It is not
freeware. Many long hours have been spent on this software and if
I go much farther with it, I will need to have support. The price
of this software is relatively inexpensive compared to a game or
other software. I do have big plans for this, including digital
simulation, semiconductors, subcircuits, and more; but I'll need
response in order to be sure this will be worth it. The price
will always be inexpensive because, I feel software is overpriced.
Please, if you use this . . . register. If not for the above
reasons, then maybe for these reasons:
No delayed 'Persuade you to register' screen. Transfer function
plots. View solved values at the touch of two keys.
If would like to see a feature added to Schematic Plus, LET ME
KNOW.
Page 10
If you have any questions or comments, PLEASE contact me at:
ACES BBS KAENTAI
364-2591 341-8981
Handle: PAUL Handle: STEVE
Steve Poulsen
825 S. Bishop - Apt. 4
Rolla, MO 65401-4300
REGISTER FORM
NAME ____________________________________
ADDRESS ____________________________________
CITY/ST ____________________________________
ZIP CODE ____________________________________
PHONE ________________
OCCUPATION _____________________ COMPANY _____________________
SUGGESTIONS ______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________
______________________________________________________
Schematic Plus Latest Version with free updates * .
Quantity ____ Price $20.00 Total _______
CHECK ONE: 3 1/2 ___ 5 1/4 ___
* Free updates will be limited to degree of improvements.
Generally most updates will be free. Author reserves the
right to deny updates at any time.
WxP