Hands-Free Adapter Circuit Diagram
Source: InternetPublisher:李商隐身 Keywords: Circuit diagrams adapters speakers Updated: 2020/07/13
Using the Motorola MC34118 speaker IC , this adapter can be used with regular phones to provide speaker functionality. This device is powered by the telephone line, but can also be powered by an external power supply if the line loop current is slightly low. External phones require ringing and dialing capabilities.
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