Telephone number sending circuit diagram
Source: InternetPublisher:难得正经 Keywords: Wireless communication telephone number sending circuit diagram Updated: 2020/08/09
The dialing circuit of the telephone is shown in the figure below. U8 is a special integrated circuit for dialing, and the model is 145409. U12 (22100) is a 4X4 cross matrix circuit (CD22100, also known as four bidirectional switches), which is used as the control circuit of U8.
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