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The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm. IC4 is used to
switch off the telephone loudspeaker and is used to amplify the signal to drive the hands-free
loudspeaker. They are selected using the SP_AMP line from pin 69 of the BBIC. 2.5mm headset
jack is also available.
24. CIRCUIT OPERATION (CHARGER UNIT)
24.1. Power Supply Circuit
The power supply is as shown.
25. SIGNAL ROUTE
69
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