The device that makes the recognizable ding-dong tune is the chime doorbell. The chime version operates a solenoid. Solenoids are a type of electromagnet similar to those founds in the older models. The difference is in the moving iron bar core that is enveloped by a coiled wire. When an electric current passes through the coil, the electromagnet becomes active and moves the iron bar through the length of the coiled wire that encases it. The movement is like a piston.
The iron bar that is inside this piston is conducive to electromagnetic activities. This allows it to move back and forth along the coiled wire. The electromagnetic field of a stimulated solenoid provides for the force to make this happen. There are two tone bars inside a typical chime model and are usually placed at opposing points. This simple design makes it possible for the solenoid to bump into both in succession. When not in use, a spring fastens the iron bar in place adjacent to one of the tone bars that makes the low dong sound. When a visitor presses for the doorbell buttons, an electrical current goes off due to the closing of the circuit. It reaches the solenoid and activates it. The solenoid next produces an electromagnetic field that manipulates the iron bar center to move along the coiled wire in the direction of the other tone bar. When it does strike it, this tone bar creates the high ding sound.
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