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ed to the -40V reference voltage.
Resistors R36
and R37 a r e selected t o provide precisely the cor-
rect programming current.
Procedures for select-
ing these resistors a r e included in the adjustment
and calibration paragraphs in Section V, Mainte-
nance.
4-24 'dhis circuit supplies regulated d c bias volt-
I
a g e s t o t h e voltage input circuit and -32V prograrn-
I
rning voltage t o VERNIER control R21.
Diodes CR21
I
througq CR24 and capacitor C10 rectify and filter
the 62 Vac developed across the secondary of T1.
4-25 Diodes CR20 and CR29 protect the constant
current amplifier against excessive voltage ex-
cusions a t the collector.
With CR20 connected
to
-64V and CR29 connected to -S, the collector of
Q4 cannot swing beyond +O. 7 to -64V.
The 66
tied to
Vdc i s regulated by transistor Q5 which i s
6. 2 V zener diode
VR1.
Various regulated
d c outputs a r e developed a c r o s s a s e r i e s string of
diodes 1 ~ ~ 2 ,
CR19, CR20, CR2
,
CR4, CR5. and
CR6.
The -32 V programming voltage i s developed
I
by constant current amplifier Q6 which
is
connect-
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