Circuit Description; Power Supply - Revox B261 Serviceanleitung

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