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SUGGESTED LOGIC APPLICATIONS
This section contains suggestions on the uses of the SCM810's logic capa- bilities. Note that uses of these functions are not limited to the listed appli- cations. The user is limited only by individual imagination and creativity. For additional suggestions and solutions to installation problems, contact Shure's Applications Group.
In the following paragraphs, the wiring diagrams refer to the
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 12- Channels 1, 2 and 3 modified). When a channel is muted, no audio is passed. (See “Dead Zone on MUTE IN Defeat” in Internal Modifications section for more information on MUTE IN logic.)
LOGIC
GROUND
M1 M3
M2
COUGH BUTTONS
FIGURE 12
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
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 activates, all other microphones mute.
CH. 1
LOGIC
GROUND
M3 | M5 | M7 |
Remote Channel-On Indicators
Remote indicators can be used to indicate when a talker's microphone is on. Connect the LEDs and a
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 capac- itive coupling between the dc power lines and microphone lines.
| + 5 V POWER – |
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| SUPPLY |
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| LOGIC |
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| GROUND |
G1 |
| G3 |
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| G2 | R = 470 | &!, 1/4 W |
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REMOTE
FIGURE 14
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 selected channels now function as they would in a
LOGIC
GROUND
O2
O1 O3
GATING BYPASS
FIGURE 15
M2 M4
M6
FIGURE 13
11