eXact 100 - Section III: Circuit Description; Transformer, Rectifiers, and Regulated Supplies

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CIRCUIT DESCRIPTION
TRANSFORMER
Filament and all DC voltages are supplied
by a single transformer T100 which operates
satisfactorily between 105 -- 125 volts.
This transformer has a single 117 volt prim-
ary; two hi-voltage secondaries and one 6.5
volt filament winding.
RECT IF TERS
The hi-voltage AC is rectified by silicon
rectifiers connected in a full wave bridge.
-150 VOLT REGULATED SUPPLY
All DC voltages in the Type 100 must have
a stable reference voltage in order to prop-
erly regulate against load and input varia-
tions. V2, a gas diode, is this stabilized
reference and sets the cathode voltage of
VI. Any variation across the bias divider
resistors R16 and R18 will be greatly am-
plified and inverted through VI causing a
correcting change in current flow through
ҮЦВ. R10 by-passes VlB and reduces the load
current through ite
+175 VOLT SUPPLY
This supply operates in essentially the
same way as the -150 volt supply except
that the -150 volt supply becomes the ref-
erence for divider resistors R7 and R8. Any
variation is amplified by V3, thereby chang-
ing the current in VA.
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