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KX-FP207FX-S/FP218FX-S
6.7.5. Line Amplifier and Side Tone Circuit
1. Circuit Operation
The reception signal output from the line transformer T101 is input to pin (2) of IC101 via C110 and R109 and then the signal
is amplified at pin (2) of IC101 and sent to the reception system at 0dB.
The transmission signal is output from CN101 (6) and transmitted to T101 via R120 and R119. If the side tone circuit is not
applied, the transmission signal will return to the reception amplifier via C110 and R109. When the side tone circuit is active,
the signal output from IC101 pin (1) passes through R114, R113, C113 and R112 and goes into the amplifier IC101 pin (3).
This circuit is used to cancel the transmission return signal.
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