Shure SCM410E manual Suggested Logic Applications, Cough Button, Remote Channel-On Indicators

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 5-volt supply to the GATE OUT pins (See Figure 22). To avoid switching clicks in the audio output, do not ground the power supply negative ter- minal in the audio system or rack ground.

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

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 non-automatic mixer (see Figure 23). 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.

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