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C-O
TUNER
I.
SP9MKHI · PREAMPLIFIER - (MUTING
&
SWITCHING CIRCUITRY) • PAGE 3
of
4 PAGES
I
+22.7
R47
7&.BK
+15
6
4
U2
NE555
+
014
1N916B
C23
.22
8
C24
33mfd
4
8
6
U3
·
2 NE555
R50
1
10M
+
013
1N916B
R51
3
1K
---~,/\J\ro--+13
POWER ON AND
MUTE INDICATOR
I
TO MUTE
RELAYS
3
+.2
SW-2
+.4
C22
.22
.
R53
'IM
499
R56
¥Mt
54.9
1
0
0
.
0
TOPHONOCKT
COMMON
TP 1
TP2
SW6
SW4
R57
MON
499
REC
OUT
(2)
AUDIO RESEARCH CORPORATION
5740 GREEN CIRCLE DRIVE
MINNETONKA, MN 55343-4424
45 SECOND WARMUP DELAY
R52
5.11K
COMMON
I
INPUT & CONTROL CIRCUITS!
MODE SWITCH
LEFT
BALANCE
RV2
ccw ...
~
•'
'
.•
'
CHANNEL
TO
RIGHT
LEFT
O
RIGHT
O
cw
CHANNEL
sws
8-5-93
COMMON
PROPRIETARY
NOTICE:
THIS DRAWING CONTAINS
PATENTED,
PATENT
PEl;JDING,
PATENT APPLIED FOR, AND/OR OTHER CIRCUITRY CONSIDERED PROPRIETARY BY
AUDIO RESEARCH CORPORATION AND IS FURNISHED ON A CONFIDENT AL BASIS
FOR IDENTIFICATION PURPOSES ONLY.
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