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本电路为可产生电话振铃声的附加电路,用于内部通信联系系统中没有振铃功能的电话机中,或一些玩具电路。从乐器产生断续音的
This circuit is an additional circuit that produces a ringing tone for the telephone, for use in telephones with no ringing function in the intercom system, or for some toy circuits. Produce intermittent sound from the instrument