How do buttons on TV remote activate on circuit board?
I just took apart a universal remote control. I had always thought the button on the top of control finished a circuit. The button is built onto a soft foam pad and looks like a non-conductor. Either the circuit board has a pressure sensitive switch or this thing works by ….? I have no way to see if the little piece of foam is a conductor or non-conductor. Do you know how the buttons on this thing operate.
There are two types. One uses magnets to pull tiny leaf switches in. The other type is by capacitance. A capacitor is nothing more than two flat conductive surfaces which when placed very close together produce some capacitance. The circuit is designed so that when a capacitance is seen it triggers a switching action in an IC. The same principal as those lamps which you have probably seen which turn on when you touch them.
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