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Circuit Description - Kenwood CO-1303D Instruction Manual

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R e f e r t o B L O C K D I A G R A M a n d S C H E M A T I C D I A G R A M (see P 2 9 )
V e r t i c a l C i r c u i t
T h e i n p u t s i g n a l c o n n e c t e d t o V E R T
s w i t c h .
T h e a t t e n u a t o r p r o v i d e s t h r e e s t e p s ( 1 , 1 / 1 0 , 1 / 1 0 0 ) .
T h e v e r t i c a l a m p l i f i e r is a h i g h l y s t a b l e d i r e c t c o u p l e d d i f f e r e n t i a l a m p l i f i e r e m p l o y i n g a n F E T ( Q 1 0 2 ,
Q 1 0 3 ) a n d s i l i c o n t r a n s i s t o r s Q 1 0 4 t o Q 1 1 1 , a m p l i f i e s a n d p r o v i d e s a g a i n o f a p p r o x . 6 1 d B .
H o r i z o n t a l C i r c u i t
T h e h o r i z o n t a l c i r c u i t c o n s i s t s of a s a w - t o o t h g e n e r a t o r f o r a t i m e b a s e a n d a h o r i z o n t a l a m p l i f i e r c i r c u i t .
T h e s a w - t o o t h g e n e r a t o r c o m p r i s i n g t r a n s i s t o r s Q 1 1 2 a n d Q 1 1 3 e m p l o y s a u n i q u e c i r c u i t w i t h f a c i l i t i e s
f o r s t a b i l i z i n g t h e D C l e v e l .
T h e
h o r i z o n t a l
a m p l i f i e r
( Q 1 1 4 ) a n d s i l i c o n t r a n s i s t o r s Q 1 1 5 a n d Q 1 1 6 .
2 5 0 k H z . I t a l l o w s o p e r a t i o n a t s l o w s w e e p s p e e d s b e l o w 1 H z t h r o u g h t h e u s e o f t h e H O R E X T . I N P U T
t e r m i n a l s .
T h e h o r i z o n t a l a m p l i f i e r p r o v i d e s a g a i n o f a p p r o x . 3 5 d B , w h i c h m a y b e v a r i e d b y a p p r o x .
1 0 d B u s i n g t h e H . G A I N c o n t r o l .
P o w e r S u p p l y C i r c u i t
T h e p o w e r s u p p l y c i r c u i t p r o v i d e s v o l t a g e — 8 V a n d ± 1 5 V , s t a b i l i z e d b y z e n e r d i o d e s D 1 0 5 , D 1 0 6 a n d
D 1 0 9 , + 1 7 0 V f o r t h e c o l l e c t o r s of t h e f i n a l a m p l i f i e r s t a g e a n d — 1 3 0 0 V f o r t h e c a t h o d e r a y t u b e c i r -
c u i t .
3 .
C I R C U I T
I N P U T t e r m i n a l is a p p l i e d t o a n a t t e n u a t o r t h r o u g h t h e A C - D C
is a d i r e c t c o u p l e d h i g h l y
T h e f r e q u e n c y r e s p o n s e is f r o m D C t o g r e a t e r t h a n
D E S C R I P T I O N
s t a b l e d i f f e r e n t i a l a m p l i f i e r e m p l o y i n g a n F E T
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CIRCUIT DESCRIPTION

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