Are there thin sheets of material on the market that have resistance levels - comparable to resistors, which vary in a well defined relation to units of distance?

 

"telo deltos" paper?

Carbon paper?

The resistance is spec'ed in ohms per square, believe it or not.

 

Well hell, that makes sence. Never thunked of that

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Pay it forward.

 

Black anti-static polythene bags.

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I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

Please ask on the open forum if you have a question and I'll be happy to help, if I know the answer.

 

Could you help me find some "telo deltos" paper? I tried to find an internet translation - and did an internet search, and couldn’t find any. I’ve used carbon paper before and never thought of its electrical properties. However, the carbon paper would be exposed to rubbing and I’m afraid that this might change the carbon paper's electrical properties. The black anti-static polythene bags might work, but something more rigid would be better. Something transparent would be the best.

 

Back in the 70s we needed to find the characteristic impedance of various shaped conductors. With this paper you paint the conductor shape on the paper with conductive ink and measure it with an ohmmeter. Using a scale factor gives you the impedance.
BDM (Braddock, Dunn & McDonald) corp. knew where to get this paper, and the correct spelling. With computers this kind of thing is probably obsolete unless it has other uses.
I hope this helps.

 

It does. I’m going to check with BDM, if they are still in business. It might also be helpful if you could check the spelling or give me any other names that the paper might go by.

 

Can anyone help me out with some engineering terms that might help me search the internet for rigid sheets – preferably transparent, or paint that has a well defined rate of resistance per unit distance?

 

ohms per square
sheet resistivity
sheet conductivity
carbon
conductive coating
resistive coating
flexible
silvery

 

A "poor man's" solution is to grind up some graphite (or buy some graphite powder) and rub it into the surface of some paper. Depending on your application (precision positioning or just needing some varying resistance), it may or may not give consistent enough results.

At one time, I had experimented with this but, the results weren't great. I didn't really try to refine the technique.

 

Hi there,


Just to note, i tried some "Wire Glue" a while back and although it was pretty neat
stuff it did not have a well defined resistance as i think you are looking for.
It was resistive alright, but it varied quite a bit with temperature and bending
of the base insulator and stuff like that.

Perhaps you can tell us what you are trying to do or build or whatever so that
we might know of something else that would work...

 

Still hung up on that game board idea are we?
Structure of resistor question
What is it about conductors that gives them resistive properties?

Are you just going to keep asking the same question over and over until someone tells you what you want to hear? Normally, when people run into problems like this in a project it's one of two things:

-It's impossible with current technology
-They are going about it the wrong way

There was oodles of respones with very in-depth discussion about why your implementation would not work the last few times you asked this question, as well as many alternatives.

To summarize what he is asking for people who aren't up to speed: He wants a resistive playing board with multiple conductive/resistive playing pieces. Placing the playing pieces on the board is supposed to change the resistance in that particular area of the board, and thus change the resistance seen by 3 contacts connected to the edges of the board. By measuring the change in resistance (or current flow) between these 3 contacts, he wants to monitor the position of all playing pieces on the board. Furthermore, he wants it to be transparent so he can overlay a "graphical map" of sorts onto the board.

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Tanaka Sensei (avatar) says: Please spell it "ridiculous" correctly! Not "rediculous". ^^

 

I might not try to delete the post until someone comes up with an idea or has specialized knowledge relating to the question that makes completion of this project a priority, and then even then I probably won't delete the post. I found the last two responses interesting. I think that the way that this site is indexed, some posts could belong in more than one forum.

 

Did you learn about graphite from a list?

 

I'm looking for a thin sheet of material that has a resistance level that varies as a function of distance up to a foot or so comparable to the resistance offered by a variable resistor.