musical E-bell circuit

Published:2011/6/12 21:36:00 Author:chopper | Keyword: musical E-bell | From:SeekIC

The following picture is a circuit of doorbell which can send out a sound like ding,dong .It is constituted of a time-base circuit integrated package and peripheral cells.The bell has a graceful and vivid tone,and it is easy and cheap to set up .A 6V laminated battery can be used over 3 months.Its electric power consumption is very low.The IC in the picture is time-base circuit integrated package 555 which forms astable multivibrator.Press the AN(which is set up on the door),the oscillator works, and the oscillating frequency is about 700Hz,and the speaker sends out ding .



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