Spectra Engineering MX800 - Circuit Diagram: MX800 CONTROLLER BOARD LOCAL VF SECTION; Local VF Section Details

1 2 3 4 5 6 7 8
A B C D
8
7654321
D
C B A
9 TRADE ROAD
MALAGA 6062
WESTERN AUSTRALIA
PHONE +618-92482755
C187
100n
ETH
C189
100n
ETH
+12
IC58
78M05
SPEAKER
+5
ETH
SW1R250
2K2
ETH
C171
100n
ETH
C170
10u
ETH ETH
C167
470u/16V
C168
100n
ETHETH
2
3
IN
4
OUT
5
VCC
6
GND
7
OUT
8
VOL
1
IC60
TDA8551
ETH
+5 +5
C169
1u
JMP23
R237
100K
ETH
C188
47n
R236
10K
C181
56p
R277
47K
ETH
+5
3 2
1
84
IC64A MC33202D
R279
10K
R278
5K6
R249
100R
C182
100n
C183
100n
ETH
RV10
100K
C184
100n
+5
ETH
TR13
BC847
ETH
R271
10K
R272
33K
R270
10K
ETH
TR12
BC847
ETH
R268
10K
R269
33K
ETH
+5
+8
R251
560R
R248
220R
C173
100n
JMP22
R254
10K
R253
470K
C172
56p
R252
470K
+5
ETH
3 2
1
84
IC61A MC33202D
GCin
14
RectIn
15
THDtr
9
-IN
12
RES
11
ReCap
16
OUT
10
IC34B SA571D
R274
56K
R257
56K
R259
33K
ETHETH
R258
5K6
R255
10K
R256
10K
R247
100K
R245
100K
R239
4K7
R238
4K7
+8
R243
22K
R244
22K
R242
470K
R240
4K7
R235
68K
R241
1M
ETH
ETH
ETH
ETH
+8
8 9
6
IC32D 4066
C161
100n
C163
56p
C69
10u
TR11
BC857
C174
10n
+5
C176
10n
C175
120p
C180
10n
C179
10n
C177
10n
C178
10n
R273
51K
+5
R276
20K
R275
150K
ETH
3 2
1
84
IC59A LM2903
5 6
7
IC59B LM2903
5 6
7
IC61B MC33202D
5 6
7
IC62B MC33202D
3 2
1
84
IC62A MC33202D
C186
100n
RV11
100K
ETH
C185
100n
+12
C191
100n
R287
68K
R286
240K
+8
ETH
5 6
7
IC64B MC33202D
C162
1u
C165
1u
C166
1u
RV9
100K
ETH
D8R292
1K
GJ22/01/03 F:SKL PIN # SWAP
SKM-1
SKM-2
VOL DOWN
VOL UP
SKK-5
SKK-10
SKK-8
DIGITAL CCTS
ANALOG CCTS
REMOVE FOR OPTION PC
REMOVE FOR OPTION PC
TONE TO SPEAKER
MC_ID2
VB
SKL-1
MONITOR_VF
LINE_IN
GJ PG
SKL-3
MIC_PTT2
MIC_TXVF
LOCAL_VF
MIC ETH SKL-5
SKL-2
IC33B-PIN2
IC33B-PIN5
MIC GAIN
MIC VF
SKL-4
VB
MICROCL REVL+
TX HPF
PRE-EMPHASIS
VB
VBVB
MX800 CONTROLLER
6 OF 6
4/4/98
29/1/96
GCS001-6G
DATE REVISION TITLE
DRAWING No SHEET REV
REF
PCB
BY DATE
DESIGNED
DRAWN
CHECKED
APPROVED
APP
SPECTRA
ENGINEERING
(C) Copyright
SECTION
GJ GP
VB
BOARD LOCAL VF
LPF + PRE-EMP CORRECTION
MIC PTT
MIC TO LINE LEVEL
SKC-2
SKD-2
RX SUPPLY
TX SUPPLY
SKK-11
SKK-12
SKK-13
SKK-14
C: COMP CHANGE3/9/99 GJ
SKH-16
SKD-5
SKD-6
SKD-7
SKD-19
SKD-20
NC NC NC NC NC
VB
6/10/00 D: TANT REMOVE GJ
E: R278,C169 GJ24/9/01
LINK IF RV9 NOT FITTED
IC12
PIN 15
CUT IF SW1
FITTED