A101
POWER
SLIPPLY
(2020131
)
The power Supply furnishes all basic operating voltages required by the counter. The supply consists of
two basic sub-assemblies.
PC Board (AlOl), containing the rectifiers, filter capacitors, and regulator circuitry.
Chassis mounted components consisting of the power transformer (TI), primary wiring, F1 fuse;
(10011
20V), the 2201240V power programming switch; and the onloff power switch (S101) mounted
on the front panel.
The basic voltages required by the counter are unregulated
+18V, regulated +5V, -5,2V, +12V and -12V.
The input AC voltage
is
full wave rectified and filtered to produce DC voltages of
i-
9V and
+
18V
The unregulated
+18V
is
used directly
as
one supply voltage. The +18V
is
regulated to a +12V by the action
of
Lh4305, a series pass transistor (MJE30551, and foldback current limiting circuitry. The -18Vis reg-
ulated to
a
-12V by Lh4304, a series pass transistor, and foldback current limiting circuitry.
The +9V
is
regulated to +5V by
a
three terminal regulator containing thermaland current shutdown cir-
cuitry. The -9V current
is
also regualted to -5.2V by a three terminal regulator that contains thermal
and current shutdown circuitry.
Figure 101 a. Power Supply Functional Diagram
I
I
--,
+5v
I
+
+5
REGULATOR
-
I
I
i-9.
I
RECTIFIERS
I
:
I
+
1
-
POWER
TRANSFORMER-
-5.2 V
I
-
5.2 V
REGULATOR
1
*
A
I'
I
+
18V
I
I
INPUT
I
I
I
-
4
I
b
I
+18V
RECTIFIERS
+12v
REGULATOR
I
.--'I
AC
+
I
I
L
A101 POWER SUPPLY
----------
A
I
REGULATOR
- -
+
-
12V
I
-12v
I
Scans by ArtekMedia © 2007
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