jgazal, do you have a plan for how to coat a diaphram as such? Perhaps a stencil held on top of diaphragm with your coating material sprayed or brushed on through?
A hopefully quick question with a long explanation:
I put together another set of rectangular drivers yesterday. These have very thin spacers(.015 in or .381 mm), which unfortunately are double sided copper plated board. I say unfortunately because I have been having trouble isolating one side from another. Inevitably, with the number of screw holes around the outside, and the very little isolating material between the two copper plates, there are some very small burrs or strings of copper connecting one side to another, even after a considerable effort at their removal. After my very best attempt at removing any and all burrs, I measured a resistance of ~250 mega-ohms between the top and bottom of the spacer.*
Assuming that perhaps this level of resistance between stator and diaphragm (once the unit was put together) might not affect the unit's performance, I put the unit together and tried it.
Question 1: will this very high resistance connection between stator and diaphragm cause a detriment to performance in the unit? Should a stator and diaphragm be completely isolated?
Once I put the unit together, it seemed to work. However, when I put the driver down and increased the volume, it began sparking along the sides (where the copper of the spacer and the copper of the stators are exposed and close to one another). I don't know if this is because the gap is so much smaller than my previous set (both because the spacer is thinner *and* double sided) or because the edge is not covered in tape (as were my previous sets, which didn't use screws).
Question 2: do your drivers spark along the edges and is there a way that you avoid this (electrical tape, hot glue, etc.)? I suppose this all could be due to my double sided copper board, so if anyone knows where to source thin copper plated board that is single sided in the USA, let me know.
Thanks for the advice,
*I should specify that my multi-meter would jump back and forth between a very high resistance and Open Loop.