Filter
Top Products
13
Diode Isolation of Logic Controls
Two or more control functions using the same logic pins can be isolated
with diodes. In this manner a channel can be muted by an overall group
mute switch, or by its own cough button (see Figure 19-Channels 1, 3 and
5 modified).
DIODE ISOLATION OF LOGIC CONTROLS
FIGURE 19
External Logic Devices
SCM810 logic levels are directly compatible with TTL and 5-volt CMOS
logic families. For information on logic gate use, refer to the TTL Cookbook
and CMOS Cookbook, both by D. Lancaster, Howard Sams Publishing Co.
Mixer logic may be used with 15-volt CMOS logic if a pull-up resistor is
used with each GATE output (see Figure 20-Channel 1 modified).
15-VOLT CMOS
FIGURE 20
Digital Controls or Microcomputers
The SCM810 logic pins can interface with custom-designed digital control
circuitry or microcomputers for unlimited possibilities of system control
functions.
GROUP
MUTE
COUGH
D = 1N4148 OR
EQUIVALENT
M1 M3 M5
LOGIC
GROUND
BUTTONS
15 V
POWER
+
–
SUPPLY
CMOS
GATES
5.1 K
G1 M1
O1
LOGIC
GROUND