Wristwatch Radio
Why does this phenomenon occur if you take a portible radio on A.M.Band and then take a wristwatch that glows?
if you push a button and push the button the radio sends a high pitch hum/squeal why does it do that?
I will guess that you are speaking about a watch that has back-lighting when you push a button on the watch.
One technique in getting an LED to emit the most light, is to send more power than it can normally handle to it, but in short bursts. It turns out that you can get more light that way than you can if you send less power, but constantly.
So I suspect that the watch uses that approach to get the back-lighting as bright as possible. That is, it generates a signal of perhaps 5 thousand cycles per second to the LEDs in the face of the watch. The wires to the LED will also radiate some energy as electromagnetic waves. And your AM radio picks up that signal, and emits a 5 thousand cycle scream.
Citizen Radio Controllato
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