I am attempting to prototype a device that has very restrictive cost and space constraints. To this end, I’ve identified a suitable angle sensing technique, but am having a hard time sourcing it as a hobbyist.
Taking apart several potentiometers has revealed that some of them contain a separate wafer of some sort of phenolic material that has a carbon resistive track printed onto it. This thin wafer sits on top of the usual pcb material that many potentiometers use as a body, and looks like the following:
Please note that the black track is physically separate from the material underneath it.
Some research has turned up two companies that offer to print custom carbon resistive tracks:
Unfortunately it seems that as an individual that is not associated with a company or business entity, there is no way to order anything from these companies in small quantities.
Does anyone have any ideas of where to source something like this? I would like to avoid having to take apart many more potentiometers in the future, especially since only some are manufactured this way.