working and principle of 2 digit door bell counter
#1

Circuit diagram of 2 digit door bell counter
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#2
A doorbell is a signaling device typically placed near an entry door to a building. When a visitor presses a button the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first doorbells were mechanical, activated by pulling a cord, modern doorbells are electric — they are actuated by an electric switch.
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