Expansion Connectors; Ground Lift Switch - AKG DMM 4/2/2 Mode D'emploi

NOTE
NOTE
D D MM 4/2/2
FORCE OFF
With a HI level at the FORCE OFF input, a
channel is manually forced to switch off.
This input has the highest priority:
x Overrides FORCE ON
x Overrides the activation of a channel by
the automatic mixing functions
x Overrides the holding of a channel by
Last Mic On (see "Automatic mixing
functions" Page 34)
A channel switched off by Force Off has no effect on the automix algorithm (see "Automatic
mixing functions" Page 34) Noise Detect, NST and Best Mic On.
VCA IN
With a DC signal, the overall volume can be varied. This jack
allows you to externally adjust or mute the output level.
Depending on the application, you can use potentiometers,
switches or external control voltages for this.
If you are using an external potentiometer, the maximum adjustable volume will be determined
by the "OUT MASTER" rotary control. For the correct adjustment, the potentiometer must be
set to 100%. Thereafter, the maximum adjustable volume is limited on the "OUT MASTER"
rotary control. The potentiometer can now be used to adjust the volume below the set
maximum value. This procedure prevents unwanted feedback.
LOGIC OUT
As soon as the microphone associated with
the channel is activated, this output is set to
5 V. It can than be used, for example, to
trigger a camera control or activate the LED
ring of a microphone.

Expansion connectors

If four microphone channels are not sufficient, several DMM 4/2/2 can be connected together
(up to a maximum of 5). The expansion connectors TO MASTER and TO SLAVE can be used
for daisy-chaining. These are two 8-pin mini-DIN jacks labelled "EXPANSION".

Ground Lift switch

The Ground Lift switch connects or isolates the case with 0 V potential of the power supply.
+3V3 +3V3
10k 10k
Force off
Figure 5: FORCE OFF diagram
+5V
P
log.
Figure 6: VCA IN diagram
+5V
from internal
circuit
Figure 7: LOGIC OUT diagram
Description
to internal
circuit
VCA
10k
Logic Out
33