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External Control Connections
The SMR™821a provides a powerful external control option. This feature allows you to configure
remote controls for the Left and Right Level controls simultaneously and the Channel 7/8 select
function. The Remote operation connector provides a simple way to make these connections. Note:
Use only shielded cable. Refer to the following illustrations.
Figure 5. Remote Volume Control Connections
Remote Volume
Figure 6. Remote Channel 7/8 Select Connections
CH 7/8
CH 7/8 Select LEDs
Select
CH 8
Switch
CH 7
This example is used to simultaneously control the Left and Right
Level Controls from a remote location with a simple connection
on the back of the unit. A 10k pot will provide approximately 0 to
30 dB of attenuation. A 100k pot will provide about 0 to 60 dB of
attenuation. If desired‚ a control voltage can be inserted to
"command" attenuation instead of a pot. This voltage is inserted
into the "C" input and is positive referenced to SHD. Note: The
control voltage should never exceed 11 volts DC.
Remote Volume Control Connections
Volume Control to Potentiometer CCW Leg (V)
Control to Potentiometer Wiper Leg (C)
Shield Potentiometer CW Leg (Shd)
This example shows the connection for remote selection of the
Channels 7 or 8 input select feature. The selection is done by
connecting a momentary switch between SEL and SHD. Each time
the switch is activated‚ the channel selection is toggled and alternated
between Channel 7 and 8. This remote operation functions in
conjunction with the front panel Select Control. A bi-color LED or 2
individual LEDs may be connected as shown in the diagram for
remote indication of the selected stereo line input. Note: The IND
circuit can supply a maximum of 6 mA for the LEDs.
Remote Channel 7/8 Select Connections
Shield (Shd)
Channel 7/8 Select (Sel)
Indicator LED Output (Ind)
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