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VCA control of amplifier levels
Each amplifier is equipped with a digital potentiometer which can be controlled
either remotely using ICORE, or locally via the GPIO port. Note that the local
control will take precedence over any remote settings so it's advisable not to
enable local control at the same time as trying to make remote adjustments.
Both channels are adjusted together under local control and no relative offset is
possible.
In ICORE, select the amplifier and open its properties window
(View
Device Properties)
As this is being used as input control system, all amplifiers that are to controlled
in this manner may have their control inputs wired in parallel to the control
voltage – as shown below using a basic "Remote" potentiometer.
Page 42
Set the GPIO Config
"Input" property to
"VCA Mode".
An analogue control
voltage from 0v to
3v3 on the GPI input
line will now adjust the
gain of both amplifier
channels, with 3v3
being 0dB.
Grounding this input
will effectively mute
both channels.*
Amplifier Operator's Manual
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