Let the phone play music (1)

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Now the mobile phone has the color ring function, which replaces the original monotonous ring tone with various languages and songs, making people feel very novel. You can change the monotonic ringing tone of your home landline phone to a music tone using chips in your toy smartphone. Below is the ring circuit of the HA3288 (22) P/TDL (LCD) "Big Bag" phone. To reduce the change of the original circuit, only two wires of the speaker in the ring circuit are welded. The two wires that are welded are breakpoints A and A'.

A and A'wires are connected to the 14 feet and ground (GND) of IC2 by the capacitors C2 and C3 shown below. The connection posts on the welded speakers are B and B'breakpoints, which are connected to B and B' points in IC4 below. This is a new ring trigger circuit.