Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hello gauravkothari23
All simulators for electronic circuits have their own bugs.
Circuits operating properly in the simulator do not make the same when We assemble in reality.
One of the things I see in your design, which you enclose in the image of your original message, is that you forgot...
Hello ismailka
Probably your Proteus 8.1 is a Demo version, for this reason some things are not working.
But if you have that fully version and correctly installed simulator can be several things not working the keyboard:
The program in the PIC.
The way you have connected the keyboard to the...
Hello pasicr
First of all, as srizbf says in his message #7: You can not use the IC's ULNxxxx.
Unless you make your Display's as common Anode.
You can probably use 2 BJT PNP transistors connected in Darlington configuration.
One pair for each segment of the display with their respective...
Hello pasicr
So, each segment has 14 LEDs connected in Series-Parallel and the DP has 4 LEDs connected the same way as the segments.
Have You the part number for this display?.
Or it is homemade?
Either way we need to know the electrical characteristics of LEDs containing In this Display In...
Hello pasicr
The electrical characteristics of the LEDs in the ISIS Proteus simulator are:
2.2 Volts when they are crossed by 10mAmp.
2.2 Volts is the parameter called VF. (Forward Voltage).
10mAmp. is the parameter called IF. (Forward Current).
The formula to find the value of current...
Hello tapu
Oh you will use again the ULN2803, Good.
But: on which Base you observed 8V ??. . . on Q1, Q2 or Q3 ??
Probably with a resistor in series with the base.
I've noticed that you do not like answering my questions. but would you like I answer yours. Any way.
May I see Your actual code...
Hello tapu
Repeatedly it mentioned they are required electrical characteristics of your 2 Inches 7-Seg. Display.
What has the identification number Display. ??.
If you do not find data sheets we will have to experiment to get what current required to turn ON these Display and the Voltage drop...
Hello tapu
You need to know the electric characteristics of your 2 inch 7 segment display in order to calculate the Rb for those TIP122 transistors.
Do you know these characteristics??
Yes KlausST I pushed the wrong key.
And Yes Also To Your recommendation
We need to analyze whether the transistor works for the frequency to be exposed.
But we do not know
Hello tapu
Each simulator has its things to improve; ISIS's Proteus too.
Mysteriously its IC ULN2803 require pull-up resistors to operate (RN2).
Apparently the resistors connected in series with the Display segments, the transistors and the 12V power supply does not serve him as such...
Hi Pawan kumar
You're right, that type of 7-segment display with LCD technology requires, say, a pulse current to avoid being destroyed.
That's why I recommended you will use the IC CD4055.
But in all that I have simulators do not have that IC only in the ISIS Proteus View 7.8 but not...
Hi Pawan kumar
What do you mean with: The MSP-430 models included Do not have LCD module. ??
I think that kind of display does not need any module to run.
For this Display (Varitronix V402) could use the IC 4055 which is: BCD To 7-Segment Decoder/LCD Driver.
The ISIS Proteus Ver. 7 does not...
Hello aliyesami
Sorry, I did not reply to your original question:
This knob is to adjust to zero reading when the instrument does not have anything connected to the probes.
Hi Pawan kumar
Have You asked to Labcenter. Creator of Proteus system ??
Visit this link: http://www.labcenter.com/index.cfm
They have a discussion forum here:
http://support.labcenter.co.uk/forums/
Probably you find something good for you.
Moreover: why not looking for these displays, first...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
