A button quit on a remote and I popped it open to clean the contacts and found......well, nothing!
There was just a rubber pad with some molded buttons laying on a printed circuit board. At first I thought that maybe the rubber had metal particles mixed in to make it a conductor or magnetized, as the PCB had circuit traces that led together without meeting under each of the elevated buttons.
But a closer look revealed that the pad was not magnetized, nor a conductor and that the PCB had a nice layer of varnish over the hole thing anyway.
Could someone tell me what principle is at work here in the operation of these buttons and what typically goes wrong?
Thanks
There was just a rubber pad with some molded buttons laying on a printed circuit board. At first I thought that maybe the rubber had metal particles mixed in to make it a conductor or magnetized, as the PCB had circuit traces that led together without meeting under each of the elevated buttons.
But a closer look revealed that the pad was not magnetized, nor a conductor and that the PCB had a nice layer of varnish over the hole thing anyway.
Could someone tell me what principle is at work here in the operation of these buttons and what typically goes wrong?
Thanks