Audio circuit – GAI-Tronics IDA1000A DC Remote Adapter Installation and Service Manual User Manual
Page 22
Theory of Operation
Model IDA1000A DC Remote Adapter
01/05
18
Audio Circuit
Receiver audio to be output on the control lines at J1 is input to the circuit board on P1-11, 3. These
signals are scaled through amplifier U2a, U10b and fed through the line audio adjustment, pot 1. The
resulting signal is gated to the line driver U11, U10a, and associated components.
Transmitter audio is input to the remote adapter through J1-3, 4, routed through transformer T1, and
scaled through U1c, U1a, U2c, and associated components. The line output gain may be set by proper
configuration of switch SW1-2.
The signal exiting U2c is fed through the line output adjustment, pot 2 and gated through U3a to the mic
hi input to the base station on P1-12.
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