Audionet PAM V2, Руководство пользователя, Страница: 7 / 8

7
Further adjustments
In case of insufficient base capacity of C
0
= 150pF (pico farads) an addi-
tional high quality miniature capacitor C
ext
can be connected to the input
labeled
C/Rext
using a cinch plug to increase input capacity. Both capaci-
ties will be added simply.
Base capacity C
0
= 150pF ; needed capacity e.g. C = 350pF, therefore
C
ext
= 200pF has to be attached.
In case of the needed resistance lower than 100
W
(positions 6 o'clock at
the ‘input imp.’ switch) an additional high quality miniature resistor R
ext
can be connected to the input
C/Rext
using a cinch plug to reduce the in-
put resistance. Attention! The reciprocal values of the resistors are added,
so the input resistance is reduced!
Needed is an input resistance R = 33
W
; the base resistance R
0
=input
imp. is selected to R
0
= 100
W
, therefore the external resistor R
ext
= 50
W
has to be attached, because of:
0
0
0
1 1
1
*
R R
R
R R
R R
R
ext
ext
ext
-
= Þ
+
=
Needed is an input resistance R = 200
W
; the base resistance R
0
=input
imp. is selected to R
0
= 330
W
t, therefore the external resistor R
ext
= 510
W
has to be attached.
Adjusting capacity
Example
Reduce resistance
Example 1
Example 2