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50v
40v
30v
20v
1 0 v
1 . 9 A ( 4 0 w )
1 A
( 3 0 w ) 6 0 0 m A ( 1 8 w )
1 . 5 A ( 3 5 w )
8 0 0 m A ( 1 9 w ) 4 5 0 m A ( 1 0 w )
' l
. 1 A ( 2 0 w )
6 0 0 r n A ( 1 0 w ) 3 0 0 m A ( 5 w )
7 0 0 m A ( 7 w )
4 0 0 m A 1 3 . 5 w ) 1 5 0 m A ( ' l . 5 w )
3 0 0 m A ( 1 . 5 w ) 2 0 0 m A ( . 5 w )
7 5 m A ( 0 . 3 w )
DA 3 240 layout
T h e s e f i g u r e s a r e b a s e d o n c o n t i n u o u s s i n e - w a v e o p e r a t i o n a n d i n
practlse current consumption will be far less - sav lz - 3/c for loud
p o p m u s i c a n d %
% f o r n o r m a l d o m e s t i c l i s t e n i n g .
D6.5.1 Battery Operation
B e c a u s e o f t h e l o w c u r r e n t c o n s u m p t i o n b a t t e r i e s a r e a v e r y s u i t a b l e
p o w e r s u p p l y ; 1 2 V , 1 8 Y o r 2 4 V a r e s u i t a b l e c o m b i n a t i o n s .
Remember however that for a power of 5W f rom the amplifier the
b a t t e r y m a y h a v e t o g i v e u p t o 1 0 W , s o d o n ' t e x p e c t t o o m u c h f r o m
a s m a l l b a t t e r y . T h e b a t t e r y s h o u l d b e a b l e t o s u p p l y t h e c u r r e n t
i n d i c a t e d a b o v e .
For battery operation the capacitor shown as C3 in D5 must be
i n c l u d e d b u t i t s v a l u e s h o u l d b e i n c r e a s e d . 1 0 0 0 p F i s t o b e c o n s i d e r e d
t h e m i n i m u m v a l u e b u t l a r g e r v a l u e s ( 5 , 0 0 0 r r F o r 1 0 , 0 0 0 p F ) a r e
a d v i s a b l e e s p e c i a l l y w i t h s m a l l e r s i z e s o f b a t t e r y . T h i s c a p a c i t o r
m u s t b e r a t e d a t a w o r k i n g v o l t a g e e q u a l t o o r g r e a t e r t h a n t h a t o f
the chosen battery.
D 7
G a i n
A s s u p p l i e d t h e Z 4 O h a s a g a i n o f a p p r o x i m a t e l y 1 1 0 t i m e s a n d t h e
2 6 0 a b o u t 5 5 ( t h i s m e a n s t h a t i t a Z 6 0 i s p u t i m m e d i a t e l y i n p l a c e o f a
Z 4 0 , t h e 2 6 0 w i l l n o t s o u n d a s l o u d ) . T h i s i s d o n e s o t h e 2 6 0 c a n b e
used with the earlier project 60 system. In both amplifiers the gain is
controlled by two resistors - R8 I R6 in 240 and R8 & R7 in 260 -
s u c h t h a t t h e g a i n i n a p p r o x .
DA 2 240 circuit
R 1 6
T R 7
C 6
1m0 25V
n t /
Ot22
R 2
t , 7 K
A
R 1 2
t , 7 0
5 K 6
R 7
1 0 K
T R 4
R 9
L K 7
22
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