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SUGGESTED LOGIC APPLICATIONS
This section contains suggestions on the uses of the SCM410's logic capabilities. Note that uses of these functions are not limited to the listed applications. The user is limited only by imagination and creativity. For additional suggestions and solutions to installation problems, contact the Shure Applica- tions 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 Figure 20). When a channel is muted, no audio is passed. (See Dead Zone on MUTE IN De-
Remote Channel-On Indicators
Remote indicators can be used to indicate when a talker's mi- crophone is on. Connect the LEDs and a
IMPORTANT: If a single cable is used for the microphone au- dio 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.
feat paragraph in the Internal Modifications section for more in- formation on MUTE IN logic.)
470Ω, 1/4 W
G1
+5 V POWER
SUPPLY
470Ω, 1/4 W
LOGIC
GROUND
G3
M3
M1
M2
LOGIC
GROUND
470 Ω, 1/4 W
G2
REMOTE
FIGURE 22
Disabling the Gating Function (Bypass)
COUGH BUTTONS
FIGURE 20
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
To keep certain microphones on at all times, wire the desired microphone channel's OVERRIDE IN pins together to the Log- ic Ground pin. The selected channels now function as they would in a
of the chairperson's channel, and wire an SPST pushbutton or toggle switch between those MUTE IN and Logic Ground pins (see Figure 21).
An alternative to a switch is to connect the chairperson's GATE OUT to the MUTE IN of other channels. When the chairper- son's microphone activates, all other microphones mute.
LOGIC
O1 O2 O3
LOGIC
GROUND
GROUND
GATING BYPASS
FIGURE 23
M2 | M3 | M4 |
FIGURE 21
12