Output driver stage
The output driver stage consists of four
OPA2134
dual channel Op-Amps
(IC400-
IC403)
each output for instance Front left
channel takes one channel of the op-amp.
The front left and front right channels are
driven down into the Pre-amp board via Pins
1 and 2 of connector Con400 and is fed into
the input switches of the Pre-amp boards
multiplex on Pin 9 from this point the signal is
dealt with as a normal signal input into the
Pre-amp.
Please note
: the left and right signals are
seen on the L937 pre-amp card circuit
diagrams as module left and module right.
The Remaining channels are rail clamped to
remove any over-voltage spikes from the rails
and to prevent damage to ancillary equipment
using diode packages
D400 – D405
.
Each output has a mute relay that when
engaged shunts the output to ground at
power up and power down preventing any
spurious D.C levels from leaving the card.
Simplified Block Diagram
Input
M
ux
M
ul
ti-
channel
in
put
s
Centre, Sub, Surround
L+R, Back L+R out
8
2
8
Volume
Front Left and Right
to host.
2
2
Mute
2
Buffer
Buffer
6
6
6
Buffer
Buffer
Volume
Micro controller
From Host micro controller
Summary of Contents for C30, P35
Page 1: ...Service Manual C30 Pre Ampli er Issue 1 0 ARCAM Bringing music movies to life...
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Page 32: ...CAM Products 2000 TM L928PB B GTO...
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