7.7
r
RI
82
r
J
01
40406
R11
5.6K
C7
IOOyF
RIO
2 f1
BIAS
R12
3.91(
E
04
40409
J2
06
LCIRCUIT
BOARD
-
Fig. 1. All
components within the tinted
area are
mounted
on a printed
circuit board. Diodes D1, D2, and
D3,
and transistors Q6 and Q7
are
mounted
on
heat
sinks. Stability and
low distortion can be attrib-
uted
to a.c.,
d.c.,
and
thermal
feedback loops. Zener diode D5 helps make the amplifier short- circuit - proof.
R3
R4
180n
10)(
+
T
10
009F
C3
33R335KK
2yF
100pFI
02
40407
03
40408
i 02
D3
05
40410
RIS
loon
ZERO
ADJUST
D4
R15
.330.
R16
.27R
E
07
R7
R6
IOOK IOK 4.7K
R9
2700
+
JO9F
BI
42V
O
1
en
AUDIO
OUTPUTTSI
J._
=
Ty8
F
RI7
20n.
-818
+82
82
O
42V
AMPLIFIER PARTS LIST
(per channel)
CI -5
-0', 15-volt
ei etrolytic capacitor
C2-
1000 -gF, 3 -volt electrolytic capacitor
C.3-
-2 -µF,
6 -volt
electrolytic
capacitor
C4-
100
-pF,
50 -colt
ceramic capacitor
C5 -Not used
C6- 300
-µF,
6 -volt electrolytic
capacitor
C'7-
100
-µF, 50
-volt electrolytic
capacitor
C8- 0.1
-/2F, 100
-volt capacitor
D1, D2, D3-- 1.V 3754 diode
1)4- 1.1'1612R diode
D5- -4.7 -volt,
1 -wall
aener
diode
(1N1519,
or
similar)
JI-
Phono
jack
J2-- Closed -circuit phone jack
01
-40406 silicon
pop transistor
Q2 -40407
silisarn
"p,,
transistor
Q3--
40408
silicon
npn transistor
Q4 -40400
silicon
"pn
transistor, with heat
sink
Q5- -40410
silicon pop transistor,
with prat sink
Q6, Q7 -40411 silicon up,n power transistor
R1- 82,000 ohms
R2- 18,000 ohms .-Ill resistors
R3
-180 ohms I% watt, unless
R4, R6-
10,000
ohms
otherwise stated
R5- 33,000
ohms
Ri-
100,000 ohms
R8-4700 ohms
R9-270
ohms
R10
- -250- ohm, V, watt trimmer
potentiometer
R11-
56110
ohms
1/12- 3900 ohms
R13-100-ohm, S/ -wall
trimmer potentiometer
R14-100
ohms
R15 -0.33 ohm,
10
watts
-see text
R16 -0?7 oho,,
10
watts
- -see text
TS1- Two -ter mioal barrier
-type terminal strip
1- Etched
circuit
board*
1 -7" x 12"
x
3" aluminum chassis / Lind
:I
C -408,
or similar)
2-1Ieat sinks
t
Delbert Blinn
X- 010 -D -3)
Jlisc. -1" standoff
spacers
(4),
hookup
wire,
shielded wire, diode clips, brackets, etc.
*A pre
-etched
and screened printed circuit
board
is
available
for $2.75 155.50 for tu-o)
from DEMCO, 219 W. Rhapsody, an Antonio,
Texas 78216. A
complete
kit
of
parts. including
heat sinks, but
less
chassis and power supply
components, is
available
for 525
per
channel.
February,
1967
43
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