16-11-2017, 03:36 PM
This wire is 0.15mm, about 35AWG, according to the wire tables I found on the internet https://en.wikipedia.org/wiki/American_wire_gauge , the resistance is 1.08 ohm per meter, and a current carrying capacity of about 200mA.
I suspect the 11k, which is almost twice my original estimated resistance of 6k, is because of further green spots which although there is continuity, there may be only a few copper atoms thickness where there are greenspots. The test will be, as Sam says, if I try and pass current through the remainder of the coil, say start off at 10mA and increase voltage to get the current up to 30 or 40mA, and then see if it holds, or fuses a dodgy green spot.
I have variable o to 300 volts supply which should do it, I believe it is capable of 100mA.
Back to unwinding the layers, I gave up using my little coil winder as there were so many breaks and nothing worth salvaging, and resorted to just pulling it off hand over hand. I have what looks looks a mass of coarse auburn hair in my bin.
Mike
I suspect the 11k, which is almost twice my original estimated resistance of 6k, is because of further green spots which although there is continuity, there may be only a few copper atoms thickness where there are greenspots. The test will be, as Sam says, if I try and pass current through the remainder of the coil, say start off at 10mA and increase voltage to get the current up to 30 or 40mA, and then see if it holds, or fuses a dodgy green spot.
I have variable o to 300 volts supply which should do it, I believe it is capable of 100mA.
Back to unwinding the layers, I gave up using my little coil winder as there were so many breaks and nothing worth salvaging, and resorted to just pulling it off hand over hand. I have what looks looks a mass of coarse auburn hair in my bin.
Mike
