3-2
•
User Controls
ADC-8432 User Manual (Iss. 01)
Jumpers and Potentiometers
This section provides a brief summary of the jumpers of the ADC-8432. Refer to
Figure 9
for
jumper and potentiometer locations and
Figure 10
for pin positions.
Figure 9. Jumper Positions
H1 — Left Channel Level
Use
H1
to set the coarse level gain adjustment for the left audio channel. The
RV1
potentiometer
adds continuous fine adjustment for the left channel.
Set
H1
as follows:
•
20dBFS
— Set
H1
into position 1+2 as shown in
Figure 9
. This is the default
setting.
•
18dBFS
— Set
H1
into position 2+3 as shown in
Figure 9
.
H2 — Right Channel Level
Use
H2
to set the coarse level gain adjustment for the left channel audio. The
RV2
potentiometer
adds continuous fine adjustment for the right channel.
Set
H2
as follows:
•
20dBFS
— Set
H2
into position 1+2 as shown in
Figure 9
. This is the default
setting.
•
18dBFS
— Set
H2
into position 2+3 as shown in
Figure 9
.
H3 — Local Ref Termination
Use
H3
to select the local reference termination. Refer to
Figure 8
for jumper locations and the
card labeling for pin positions.
Set
H3
as follows:
•
75
— Set
H3
into this position (top two pins) to select a local reference termination
of 75
Ω
. This is the default setting.
•
110
— Set
H3
into this position (bottom two pins) to select a local reference
termination of 110
Ω
.
•
HI or no termination
— Set
H3
into one pin or do not connect the jumper to
select no local reference termination.
RV1, RV2 — Left Gain and Right Gain
The fine input level and headroom adjustment is made using the Left Gain (
RV1
) and Right Gain
(
RV2
) potentiometers. These potentiometers provide ±0.2dB adjustment on the –20dBFS jumper
setting and the –18dBFS jumper setting. If necessary, use a tweaker screwdriver to adjust the fine
analog audio input and output levels of each channel.