/diy/ - Do It Yourself

>>1275435
The problem with a direct connection is that the thermocouple tip is conductive and is at a nonzero potential with respect to the soldering iron's grounded tip. Though using a small 3V lithium coin cell I could fairly easily power the assembly separately and simply use optocouplers, which now that I think of it is probably by far the best solution. And here I was trying to come up with some sort of DC isolation transformer. I don't think a spring or other assembly is necessary, I should be able to simply press the iron's tip onto the thermocouple while it sits on a piece of FR4.

Most thermocouples (on ali at least) that look to have low heat capacity aren't rated for 450C, like pic related, only up to 350 or so. As far as I know all of those materials are good to at least 700C except for the rubber near the end, will I be fine if I remove only this?