Quote:
Originally Posted by DerAlte  Ozi @clip-maharaz, using silver or copper wires you will get non-inductive resistors all right, but in the milli-ohm range - both are "good conductors". What value do you need?
Yes, a double-helix (one for up, other for down) is the way NI resistors are made. Cost a bomb to make since this is precision machining as compared to the simpler single helix resistors. Lower power ones are screen printed on ceramic. Neither of the above are processes suitable for DIY. :(
Read up on wires that are used to make resistances. There are different alloys for different resistivity ranges. You need to insulate them somehow - they come bare. At a pinch, even the wire used in the heating element of a toaster might do. Measure out the exact length based on the resistance you need, double it up, and wind it around a ceramic cylinder - simple. Attach copper leads to it (bl**dy things are difficult to solder), put a conformal coating on the whole assembly, and you are good to go! 
Perhaps it would be easier to buy it off-the-shelf.  |
it is easier but it should be available too which they are not. at lease anywhere in punjab.
what i can do is get the required resistance in a wire wound resistor and unwind the wire used. i did this succesfully today. i can use nail enamel or some other thing.
i have an idea. don't know if it is possible but i think i can do it. ill double the wire and wind it. i will then secure half the wires ends and remove the half. then i can use enamel to insulate it. nexta i will repear the step for the other hal wire and join the wire at one end. the other 2 i guess will be the in out terminals. what say deralte phappa ji? is it a good idea? seems like i have a brain. lol.
buying a resistor is out of question. i will first have to apply for a credit card which i really am not interested to use. And i can't wait. thats my biggest problem.
And please check your Pm inbox.
cheers phappa ji
clip