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power is lost. It is soldered to the board for
stability. It is automatically charges whenever
the Drone is powered.
D. Power Supply Connectors
Plated holes are provided for connection of
+12 VDC and ground from an IQ-LPS or other
nominal 12 volt supply. Holes are sized to ac-
cept 8-32 screws.
E. Computer Communication
The Drone has a female DB9 serial port for
communication with a computer via RS232
or RS422. The Drone has been specially de-
signed to automatically sense and adjust for
either of these communication standards.
Since RS232 is standard on PCs, the Drone
is designed to accept commonly available
Radio Shack 26-117 RS232 cables.
F. Crown Bus Communication
The Drone supports two Crown Bus serial
data loops for control of up to 250 of each
type of IQ component per loop. The Crown
Bus is a communication standard for carry-
ing IQ command protocol. It normally oper-
ates on a 20 ma current loop, which the Drone
supports. Using external tranceivers, fiber
optic cable can also be used for long dis-
tance Crown Bus loops.
G. +10V Source
The Drone provides +10 VDC for use by ex-
ternal devices such as potentiometers. The
reason for this is to support the use of exter-
nal pots for adjusting voltage to the voltage
sensing analog inputs.
H. Unbalanced Analog Inputs
Of the Drone's 16 analog inputs, 12 are un-
balanced (analog inputs 5 through 16). These
inputs sense an analog DC or AC voltage
from zero to the Drone input sensitivity. Input
sensitivity is factory set at +10 VDC (7.07 VAC
RMS, or +19.2 dBu). An analog input may be
a DC voltage sensed via linear potentiom-
eter, or may be an AC or audio signal.
I. Gain Set Resistors
R1 through R20 are installed gain and sensi-
tivity resistors for the analog inputs (balanced
and unbalanced). These resistor fix the sen-
sitivity of the analog inputs. They may be
changed to modify input sensitivity up or
down. They also affect gain from balanced
analog inputs to their respective analog out-
puts.
J. Balanced Analog Inputs
Analog inputs numbered 1 through 4 are
balanced. The reason for balanced inputs is
to accept balanced audio from sources such
as a microphone, as well as accept a linear
voltage sensed from an external potentiom-
eter. Phantom power (10V) is available by
modifying the Drone T-board.
IN 7
IN 8
IN 9
IN10
IN11
IN12
IN13
I
IN14
IN15
H
IN16
+10V
G
+10V
+10V
OUT3
M
OUT4
AUXIN 9
AUXIN 10
N
AUXIN 11
AUXIN 12
AUXIN 13
AUXIN 14
AUXIN 15
AUXIN 16
AUXOUT 9
AUXOUT 10
O
AUXOUT 11
AUXOUT 12
P
AUXOUT 13
AUXOUT 14
AUXOUT 15
AUXOUT 16
F
+I
-I
+O
+12V
-O
+I
D
-I
+O
-O
DRONE
T-BOARD
460004
GND
Drone "T-Board" For External Connections
K. Phantom Power Resistors
To provide phantom power to the balanced
analog inputs for condenser microphones
involves add two 2 Kohm resistors per input.
The Drone T-board comes from the factory
with these resistors not installed.
+
+
C1
C2
C3
R21
R22
R23
R7
R1
+IN1
R8
R17
-IN1
R9
R2
+IN2
R10
R18
-IN2
R11
R3
+IN3
R12
R19
-IN3
R13
R4
+IN4
R14
R20
-IN4
R15
R5
IN 5
R16
R6
IN 6
+10V
+10V
+10V
OUT1
OUT2
AUXIN 1
AUXIN 2
AUXIN 3
AUXIN 4
AUXIN 5
AUXIN 6
AUXIN 7
AUXIN 8
AUXOUT 1
AUXOUT 2
AUXOUT 3
AUXOUT 4
AUXOUT 5
AUXOUT 6
AUXOUT 7
AUXOUT 8
L. Phantom Power Coupling Caps
A second modification to each balanced ana-
log input is required in order to provide phan-
tom power. Isolation capacitors are shorted
for DC coupling, but to AC couple and pro-
vide phantom the short may be removed by
+
+
+
+
+
C4
C5
C6
C7
C8
R24
R25
R26
R27
R28
+12V
GND
+
L
K
J
I
H
G
M
N
O
P
E
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