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12
SUGGESTED LOGIC APPLICATIONS
This section contains suggestions on the uses of the SCM410's logic ca-
pabilities. Note that uses of these functions are not limited to the listed ap-
plications. The user is limited only by imagination and creativity. For
additional suggestions and solutions to installation problems, contact the
Shure Applications Department.
COUGH BUTTON
The talker can turn off his or her microphone during coughing or private
conversations by installing an SPST pushbutton switch between the
MUTE IN and Logic Ground pins for each channel to be modified (see Fig-
ure 7). When a channel is muted, no audio is passed. (See
Dead Zone on
MUTE IN Defeat
paragraph
in the
Internal Modifications
section for more
information on MUTE IN logic.)
CHAIRPERSON-CONTROLLED MUTING
The chairperson can, by activating a switch, silence all other microphones
and be heard without interruption. For operation in this mode, connect all
the MUTE IN pins together
except that of the chairperson's channel
, and
wire an SPST pushbutton or toggle switch between those MUTE IN and
Logic Ground pins (see Figure 8).
An alternative to a switch is to connect the chairperson's GATE OUT to
the MUTE IN of other channels. When the chairperson's microphone ac-
tivates, all other microphones mute.
REMOTE CHANNEL-ON INDICATORS
Remote indicators can be used to indicate when a talker's microphone is
on. Connect the LEDs and a 5-volt supply to the GATE OUT pins (See
Figure 9). To avoid switching clicks in the audio output,
do not
ground the
power supply negative terminal in the audio system or rack ground.
IMPORTANT:
If a single cable is used for the microphone audio
signal
and
the LED dc power, separate shielded pairs
must
be
used. Failure to carry the dc power on a shielded pair may result in
audible clicking due to capacitive coupling between the dc power
lines and microphone lines.
DISABLING THE GATING FUNCTION (BYPASS)
To keep certain microphones on at all times, wire the desired microphone
channel's OVERRIDE IN pins together to the Logic Ground pin. The se-
lected channels now function as they would in a non-automatic mixer (see
Figure 10). To perform this modification internally on the mixer, refer to
the
Shorting Override In to Logic Ground Internally
paragraph in the
Inter-
nal Modifications
section.
M1
M3
M2
COUGH BUTTONS
FIGURE 7
LOGIC
GROUND
M2
M3
M4
CHAIRPERSON-CONTROLLED MUTING
FIGURE 8
LOGIC
GROUND
+
G 1
G 3
470 ,
1/4 W
470
1/4 W
470
1/4 W
G 2
7
7
7
,
,
REMOTE CHANNEL-ON INDICATORS
FIGURE 9
LOGIC
GROUND
5 V POWER
SUPPLY
O2
O1
O3
GATING BYPASS
FIGURE 10
LOGIC
GROUND
Summary of Contents for SCM410E
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