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+5 Vol t Stabil iser
4.57
When the POWER switch is set to ON D28 is connected between the +5 volt
rail and 0 volts. This turns on 033, which turns on 036. 036 draws current
through D30 to provide a voltage at IC11a/2.
IC11a compares this voltage with 0 volts,
and regulates the volt drop across 051 (via 032) to maintain a constant potential on the
+5 vol trail.
-5Volt Stabiliser
4.58
The -5 volt rail is stabilised by 052, which is controlled by IC11b (via 034).
~he
vol tage at IC11 b/7, derived from the potentiometer chain R143, R139, R140
is compared with 0 volts at IC11b/6.
ov
tSV
' ' - - - - y r - - - - /
6· BK
10
R 143
R139
R
140
6·8 K
OUTPUT
. / ' - - -
TO
Q
34
ICll b
(COMPARATOR 1
-5V RAIL
-5V Stabilizer
9916 Vol. 2
Fig. 4.1
4-9
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