Phone With Musical Songs(I)Circuit

Published:2011/5/5 1:06:00 Author:chopper | Keyword: Phone, Musical Songs | From:SeekIC

Now phoneshave the function of polyphonic ringtone and use various languages as well as songs instead of the traditional ringing,which makes people feel very novel.we can convert the monotonous ringing of home phone into songs with the chips in toy phone.The following picture is the ringing circuit of HA3288(22)P/TDL(LCD) SUBOR .In order to reduce the changes from the original circuit,unsolder two wires of loudspeaker in the ringing circuit merely.Entitle thesetwo wires A and A'. 　 Connect wires A and A'toGND through capacitorC2、C3 of the following circuit and the pin 14 of IC2.Entitle twobinding posts of the loudspeaker unsoldered B and B',and connect these two points to the corresponding point of IC4ofthe following picture.Picture below is the new ringingtrigger circuit.



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