MultiSIM and Input Signal

A

-=Almazick=-

Guest
Can anyone please help me out. I'm using MultiSIM 2001 and can't figure out
how to simulate "Signal from Gear Position Sensor" from schematic????
http://www.bluegauges.com/gpi_stuff/gpi_schematic.gif

Here is some more info about schematic

It basically uses comparators to compare the voltage coming from the GPS
(Gear Position Sensor) to predetermined levels and then will ground the
negative lead of the appropriate LED on the display. The LED's will be lit
up in a continuous style. R1-R7 = The resistors form a ladder that breaks
up the 5v from the voltage regulator (U1) into reference signals to
determine at what voltages the LM339AN (Comparator) will use to ground each
corresponding LED.
The comparators in this circuit will turn on each LED as follows:

1st LED = Anything over 1.022v

2nd LED = Anything over 2.043v

3rd LED = Anything over 2.660v

4th LED = Anything over 3.356v

5th LED = Anything over 4.052v

6th LED = Anything over 4.526v
 
"-=Almazick=-" <Almazick3@comcast.net> wrote in message
news:BsLZa.121337$YN5.84974@sccrnsc01...
Can anyone please help me out. I'm using MultiSIM 2001 and can't figure
out
how to simulate "Signal from Gear Position Sensor" from schematic????
http://www.bluegauges.com/gpi_stuff/gpi_schematic.gif

Here is some more info about schematic

It basically uses comparators to compare the voltage coming from the GPS
(Gear Position Sensor) to predetermined levels and then will ground the
negative lead of the appropriate LED on the display. The LED's will be lit
up in a continuous style. R1-R7 = The resistors form a ladder that breaks
up the 5v from the voltage regulator (U1) into reference signals to
determine at what voltages the LM339AN (Comparator) will use to ground
each
corresponding LED.
The comparators in this circuit will turn on each LED as follows:

1st LED = Anything over 1.022v

2nd LED = Anything over 2.043v

3rd LED = Anything over 2.660v

4th LED = Anything over 3.356v

5th LED = Anything over 4.052v

6th LED = Anything over 4.526v
Click to expand...
Multisim has a potentiometer. Why not use that to apply a varying voltage
to the inputs?
 
Thanks a lot Charles. You solved my problem. Can I ask you what
is the best way to replace Leds with 7 Segment Display? Let's say I use 4511
5V BCD to 7 Segment Latch/Decoder/Driver. I have 7 negative signals from
comparators and 1 positive thru 7 Segment COM pin. How can I calculate how
many and how to put Gates? What is the best way to make it work?
 
"-=Almazick=-" <Almazick3@comcast.net> wrote in message
news:47SZa.122565$uu5.17642@sccrnsc04...
Thanks a lot Charles. You solved my problem. Can I ask you
what
is the best way to replace Leds with 7 Segment Display? Let's say I use
4511
5V BCD to 7 Segment Latch/Decoder/Driver. I have 7 negative signals from
comparators and 1 positive thru 7 Segment COM pin. How can I calculate how
many and how to put Gates? What is the best way to make it work?
Click to expand...
There are many ways to solve this kind of problem. You could use a diode
matrix, FPGAs, discrete logic, a PIC chip (overkill, unless there are other
things it could do), and so on. It might be better to eliminate the BCD
chip since you are trying to convert a type of "thermometer code" to a
digit type display. There might be a chip out there that does this. I
don't even try to stay current on this sort of thing!
 
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