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E )
Quad
fu l l -wave br i d ge
t r a n s actor o u tpu ts ( Pr i n ted C i rcu i t Ca rd i de n t i fi ed a s nxn )
F )
Rel ay-mo u n ted
o v ervol ta ge protecti o n a n d s i g n a l n o Rn ( R1, R3 , P1; R2 , R4, P2; Z1, Z2; D1, D2 )
G )
Lev e l -detecto r c i r7 ca n be co n n ected to geth e r a nd then swi tched to +DC fo r
i n i t i a t i o n o f the B/0 t i mer.cu i try n ece s s a ry to de tect AC l ev e l and co n v e r t
nFILL-IN" t o D C l o g i c l ev e l s ( Pr i n ted C i rcu i t C a r d i d e n t i fi ed a s nAn )
H )
B reake r- fa i l u re t i me r w i t h co n t i n u o u s a dju s tmen t from 5 0 t o 5 00 m i l l i s eco n d s
w i th reed rel ay d r i ve ( Pr i n ted C i rcu i t Ca rd i dent i fi ed a s nB n a n d exter n a l l y
mo u n ted r h eo s ta t P3, A/0; P4, B/0 )
I.
B re ake r- fa i l u re tr i pp i n g re l ay ( B FT)
s uppre s s i o n ( D3 ) a n d cu r re n t l i mi t ( R5 ) h a v i n g th ree ( 3 ) norma l l y-open co n tacts
a nd two ( 2 ) e l ectromec h a n i cal ta r g e t s ( T1, T2 ) .
PRINTED CIRCUIT CARDS
The fo l l owi n g sect i on s d e scr i be t h e ope ra t i o n o f the pr i n ted c i rcu i t cards.
VIII s h ows t h e pri n ted ci rcu i t ca rd i n te r n a l i ncl u ded i n e ach SB C mode l .
PRINTED CIR CUIT CARD FIGU RES
A
B
2 6
2 7
2 6
2 7
2 6
28
nAn CARD ( Level Detecto r w i th Adju s tabl e n FILL-INn
The powe r s uppl y vol t a g e s a re co n n ected to the fo l l ow i n g p i n s:
+10.2 VDC
Re fe re nce
-10.2 VDC
Fo r t h e nAn ca rd,
i n fo rma t i on ( l o g i c l ev e l ) i s obta i ned a t the respect i v e ca rd p i n s 12, 14, 16, 18 a n d
19.
The M C17 09L ope ra t i o n a l a mpl i fi e r • s i n v e r t i n g i nput ( 4 ) i s b i a sed at app rox i ma te l y
+2.4 VDC, by R1 and R24.
n e ga t i ve vol ta ge l ev e l pre s e n t.
mo re po s i t i v e t h a n the 2 .4 VDC, the Op-Amp sw i n gs po s i t i ve ( TP3 ) a nd d r i v e s Q1 On.
In a qu i esce n t d ropped-ou t s ta te, t h e n, TP3 i s a n e ga t i ve s i g n a l ; Q1 i s O f f, Q2 i s
O f f, t h e u n i -ju nct i on o sci l l a to r ( P1, C3 a nd Q3 ) i s o sci l l a t i n g; Q6 i s On and the
s i g n a l at TP4 i s n o n.
s tops o sci l l a t i n g a nd capaci tor C3 i s fu l l y d i scha rged; Q2 come s On, Q4 s tays non
con d u ct i n g, Q5 come s On, Q6 goes O ff, a nd th e o u tput a t TP4 come s h i g h.
GEK-45464
fo r
fu l l -wa ve
compo n e n t s
n ece s s a ry
TABLE VII I
C
X
2 9
31
30
31
30
3 1
P i n #10
P i n s #1 a nd #20
P i n #11
the
i nput
i n fo rma t i on
W h i l e the i nput a t TP2 i s bel ow th i s l ev e l , TP3 h a s a
As t h e TP2 ( No n- i n v e r t i n g i npu t ) s i g n a l becomes
When TP3 comes h i g h, Q1 goes On, t h e u n i ju nct i o n o sc i l l a to r
rect i fi ca t i o n o f �A,
fo r
ve rn i e r tra nsacto r
i s a type-J tel ephone rel ay w i th s u rge
Y
z
32
32
3 3
3 2
3 3
( Red Te s t Po i n t )
( B l ack Te s t Po i n t )
i s
s uppl i ed to P i n #12.
16
a nd 3I o
�B ,
� C,
vol ta ge co n t ro l ,
Tabl e
S B C MODEL
12 S B C 2 3 A - D
12 S B C2 3 B ( - ) D
12 SB C2 3 C ( - ) D
T h e o u tp u t
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