Revox B261

sTUDt=R
REVOX
8261
SA
sEcTtoN
3/1
CIRCUIT
DESCRIPTION
3.1 POWER
SUPPLY
L.726.720
The
power
supply
I.726.720
provides
the
stabilized
and
unstabilized
DC voltages
for the
individual
assemblies
Stabilized
voltages
(DC):
+33 V
+15
V
+5V
-15
V
Unstabilized voltages
(DC)
:
+23
v
(input
capacitor
+
15 V
supply)
-23
v
(input
capacitor
-15
V
supply)
3.1-f Transformer
On the
primary
side,
the bobbin
(SU48B,
conforming
to
rEC 65
is connäcted
without stranded
wires.
The
parts
energized
by
line voltage
are
located
on one side,
the
PCB for the
secondary
wiring
(with
cable connectors
to
the
power
supply
PCB) on the opposite
face of the
transformer.
3.1.2
Power supply
PCB
The
and
The
bya
+33
V are
generated by a drscrete
circuit,
the
+L5
V,
-'15v
+5
V by
integrated
stabil-j,zers
(LM3l7/LM337).
stabilized
voltages
+33V, +15
V and
-15
V can
be
switched
control
Iine
(PSON)
PLUG
PI PIN Nr.
I
2
3
4
5t6
'l
o
9
l0
1l
+33V
-23V
+
23V
OV-
PH
OV-A
0v-8
-
l5v
+
15V
PSON
+5V