Arrakis Systems MARC-15, Техническое руководство, Страница: 61 / 82

I N S T A L L A T I O N I N S T R U C T I O N S
4.33
13.8 Console Balanced Output to Transformer Input
Transformer sources require a fixed impedance for proper performance. The console output impedance is low
compared to the impedance of most transformers and will require a resistor to match the transformer.
(+)
(-)
AUDIO
INPUT
CHASSIS
GROUND
SHIELD
(-)
(+)
(-)
ISOLATION
TRANSFORMER
BALANCED
CONSOLE
OUTPUT
SHIELD
Zin > 10k
ohms
Source input
matching resistor
(Rsource)
Signal In
Electronic
Ground
ACTIVE
UNBALANCED
AUDIO INPUT
CHASSIS
GROUND
Console Output
Matching Resistor
(Rseries)
Console Output impedance
(Rconsole)
Isolation Transformer
Impedance
(Ztransformer)
Rseries = (Ztransformer / 2) - Rconsole
Rsource = Ztransformer
13.9 Console Balanced Output to Isolation Transformer Unbalanced Input
Transformer sources require a fixed impedance for proper performance. Matching resistors are required as illus-
trated below.
(+)
(-)
(+)
(-)
(+)
(-)
Console Output
Matching Resistor
(Rseries)
Console Output impedance
(Rconsole)
input Transformer
Impedance
(Ztransformer)
Rseries = (Ztransformer / 2) - Rconsole
BALANCED
CONSOLE OUTPUT