wuchy143
Member
Hello,
I attached a pic of two half moon pads on a printed circuit board. You can think of these two pads having an equivalent capacitance.(as in real life they do have capacitance) The question I have is when you place a circular piece of foil directly over the pads(but not touching) why does this increase the overall capacitance of the pads on the PCB? I see by experiment that it increases the capacitance by about 20nF...which is considerable considering my application(capacitive touch).
If you have equations that's cool but I'm really struggling to get a clear idea of what's going on in my head. So sometimes words help the best. Whatever you got I'll take though![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
-mike
I attached a pic of two half moon pads on a printed circuit board. You can think of these two pads having an equivalent capacitance.(as in real life they do have capacitance) The question I have is when you place a circular piece of foil directly over the pads(but not touching) why does this increase the overall capacitance of the pads on the PCB? I see by experiment that it increases the capacitance by about 20nF...which is considerable considering my application(capacitive touch).
If you have equations that's cool but I'm really struggling to get a clear idea of what's going on in my head. So sometimes words help the best. Whatever you got I'll take though
-mike