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Many doorbells these days just play a recorded 'ding-dong' noise.
I assume it came from this past century with simpler electric doorbells.
They work like this:
There are two plates of metal, kinda like bars from a xylophone. Between them is a solenoid. The solenoid causes a small rod to move in one direction when it is turned on. The rod is spring loaded so it returns in the other direction when the solenoid is turned off.
So you push the button, the solenoid activates, the rod strikes one metal bar (ding), you let go of the button, the solenoid turns off and the spring pushes the rod into the other metal bar (dong).
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∙ 13y ago
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