RECEIVER
1
-1
EXPANDER
I--"~
__
---------,
>--+
AUXOUT
RECEIVER
2
-1
EXPANDER
I---"~
__
--""
BALANCE
INTERCOM
GAIN
~
TRANSMIT
OUT
INTERCOM
T
RS
HIGH/LOW
(ON
VERSION
2
ONLy)
RECEIVER
3
-1
EXPANDER
I---"~
__
------+I
RECEIVER
4
-1
EXPANDER
IC---....~
__
-.J
o
DYNAMIC/
ELECTRET
HEADSET
_~~
....
I.4ICROPHONE
....
AUXIN
MIC
GAIN
~
T
>---\-------11>
SPEAKER
Figure
19
Block
Diagram
Versions 1
and
2
3-31