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printed circuit touch control

bubblehead1

New Member
I have all the parts from a treadmill and everything works.:) What I need to do is go from the touch control to another type of control hopefully a switch and potentiometer. Attached is a couple of pictures of the existing touch control that I need to change. Don't know much about this type of control. Any ideas? Thank you.
 

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Pommie

Well-Known Member
Most Helpful Member
Assuming there are 8 buttons and the left most trace goes to the top of each button, then a push button with a 10k (guess) series resistor should be able to replace all touch pads.

Mike.
Edit, was there a rubber keypad on top of that PCB? If so, the resistor value may be too high.
 

bubblehead1

New Member
Thanks, Pommie.
I will need to do some surgery on one of the key pads that I don't need and I will let you know. I only need three on the keys because I am using the mechanical parts for a project.
Bruce
 

bubblehead1

New Member
Pommie
Peeled off one of the pads on the front side of the circuit and did not find any rubber or padding of any kind. I will try the 10k resistor and see what happens.
Bruce
 

rjenkinsgb

Well-Known Member
Most Helpful Member
They look to be basic metal-to-metal membrane switches, you should be able to replace them with any generic push to make switches, no resistors needed.

The interleaved "finger" contacts are on one layer and metal ovals on another, with a separator layer inbetween that has cutouts around the contact areas. That keeps them apart normally but allows the outer layer to be pressed in and short the two sets of finger contacts.
 

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