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Buzzer is sounding equipment from DC. Sheet metal is sucked by an electromagnet. Make a point of separation As a result, the inflow to the electromagnetic flow. The sheet metal is tripped. It happened like thisChime in with a hammer attached to a metal plate near the bell on a metal plate vibrating hammer to knock the bell
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Electric door phone is a device that produces sound from direct flow. Sheet metal is being absorbed by the electromagnetic. Make a separate touch points. In effect, the incoming flow to the electromagnetic flow so the sheet metal with the rebound occurs gradually. In an electric Bell with a hammer next to the metal plates near the buzzer when the sheet metal hammers would rattle Bell tap
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Electricity is a creaking sound from the device to the metal plate will be direct current shock, Electromagnetic Fields, contact points out, the current into the electromagnetic flow stops, so the metal plate so that it rebounds back up this increasinglyThere is a hammer in an electric bell attached to the metal plate near the bell when the metal plate vibration hammer would shake bell