Panasonic KX-TCD715EM Service Manual page 24

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6.3. Speakerphone (SEE Fig. 21)

The extra circuitry for the TCD715 speakerphone circuit comprises a microphone, a speaker,

and a speaker amplifier IC14. However, note that the majority of the speakerphone functionality

is contained within the existing BBIC IC6. This includes the switching between microphone and

speaker path, echo suppression and cancelling, etc.

Around circuit of T14 is filter in order to reduce sampling noise.

The DC supply to the speakerphone amplifier IC14 pin 6, is a 6V supply, derived from the

regulator IC1 (TP220).

Circuit Diagram

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