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Model 280B
Schematic
Diagrams and Parts
List
TP3
(
I
R4
PI03
I~
IWKHZ
~
~fu
,
'VV\
+25VI
1,1/2'.'1
5%
C4
..l
I
UF~
SOV
~
20'.
~BC40
9C
---1
1
3
C3
.1 UF
:!: 20
"10
rav
R5
4.7K
V
p-p
R6
>-
5K
5%
-25VI
I
O
~I----~~------------------------~
GNO
1
2
GN
OI
7
GNO
I
8
201817C
c2
1+
~R
2
47UF
J
390
2
SV
Q4
RI3
B.2K
RI5
I
1/2'.'1
R3
390
Q5
BC409C
RI2
3.3K
CI
10
PF1
1
00V
+
1
C6
2.2UF
35V
RIO
1\1\
IK
RII
IK
CRI
soos'
CR
2
S005
Q
I
D4007
REFERE NCE
DESIGNATIONS
LA
S
T
USED
NOT USED
RI6
(;-8
LI
CR2
Q5
TP
:;,
TI
P
NOTE
I. U
,
\ l
LESS
OTHERWISE
ALL
1/4
LI
IO).A.H
RES
ISTOR
VALU
ES
'.'I,
5
%
.
T
PI
(YELLOW)
·'40V
P-P
SPECI,c
IED
ARE IN OHMS,
160 KHZ NOMINAL
C5
,47UF
(PART
Of)
250V
PI03
RF
BIAS
R8
1
.
5K
I!
ZW
5%
Figure 8-53. Bias Amplifier, Schematic Diagram
8·115/8·116
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