So they work by closing the circuit then? What is the purpose of the the
circuit pattern underneath the button?

Is it possible to get replacement buttons to get these to work?

Thanks

PeterD wrote:

On Fri, 31 Aug 2007 21:07:11 GMT, R Kannan
wrote:

Hi,

I have an old Schwinn stationary exercise bike which has rubber buttons on
the console for timer, speed etc. The buttons stopped working and taking
out the button, I found the buttons are basically made of rubber with hard
plastic core which presses against the circuit board. There does not seem
to be metal contacts on the buttons. The circuit board has small finger
like' structures from two terminals which are interlaced where the button
makes contact. How do these things work. Can I purchase replacement
buttons

I am sure the manufacturer does not have replacement parts for this old
bike and I would hate to throw the whole bike away because of the
defective buttons.

TIA for any help.

That inner 'core' is a high carbon, conductive rubber. You'll find the
same stuff in many remote controls.