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11
Using the 20/20 AD
20/20 AD User Guide
The following figure indicates the locations and factory settings of these jumpers
on the board. In their
closed
positions, the jumpers have their right two (or lower
two) pins shunted together. To open a jumper, move the shunting block to the
left (or upper) two pins. (Note that the jumpers in J13 have only two pins; to open,
simply remove the shunting block.)
U30 U31
W18
W17
U42 U48
U49
J13
W27
W26
W16
Analog Jumpers
Digital Jumpers
W2 W9 W10 W11 W12 W13 W14W1
Jumper locations
(shown with factory settings)
Note that the 20/20 AD’s analog inputs are
not
transformer isolated. It is,
therefore, necessary to have one ground connection between the 20/20 AD and
the audio source.
In addition to the ground lift jumpers, each analog input has a 600Ω termination
jumper. If the analog source expects to see a 600Ω load, these jumpers should
be closed.