INTRODUCTION
The RD320 Digital Delay is used for speaker distance delay or speaker time
alignment. The RD320 is housed in a single rack space chassis, and has two
delay modes selected by a shorting jumper behind the front panel security cover.
It provides a delay range of either 5 - 320 milliseconds, or 40 - 1280 microsec-
onds. The delay is easily set from the front panel by setting the DIP switches, and
the input and output levels are adjusted via front panel trim potentiometers.
DESCRIPTION
FRONT PANEL
+16 +10 0
-7 -13
INPUT LEVEL
D I G I T A L
D E L A Y
RD320
INPUT
LEVEL
OUTPUT
LEVEL
MS
uS
5 10 20 40 80 160
PWR
INPUT LEVEL LEDs: Indicate the amount of input signal level, in decibels.
INPUT LEVEL: Adjusts the amount of input signal.
OUTPUT LEVEL: Adjusts the amount of output signal.
DIP SWITCHES: Set the delay time
MS: If the shor ting jumper is in this position, the long delay time has been se-
lected.
µ
S: When the jumper is in this position, the short delay time has been selected.
PWR: Indicates that the RD320 has power and the power switch is in the ON
position.
REAR PANEL
OUT
IN
+ -
- +
MODEL RD320
120 VAC
50/60 Hz 15 VA
SERIAL NUMBER
320-
NRTL/C
WARNING:
To reduce the risk of
electric shock or fire, do not expose
this device to rain or moisture.
CAUTION:
To reduce the risk of
electric shock do not remove lid. No user
serviceable parts inside. Refer servicing
to qualified service personnel.
RISQUE DE CHOC - NE PAS ENLEVER
MADE IN U.S.A
OUT: The “+” sign indicates the positive or non-inverting terminal, and the “-”
indicates the negative or inverting terminal. Use these, along with the Ground
terminal for a balanced output.
IN: The “+” sign indicates the positive or non-inverting terminal, and the “-” indi-
cates the negative or inverting terminal. Use these, along with the Ground termi-
nal for a balanced input.
OPERATION
Setting the Input and Output levels
Use the LED bargraph for setting the input level. With a typical sound level input,
set the Input level as high as possible so the 0 dB LED is on approximately all the
time, and the red +16 dB LED lights occasionally - only on the highest peaks. Set
the output level to drive the power amp or signal processing that follows the delay.
The input level range is from -infinity to unity gain. Remember to run the input level
as high as possible without clipping to achieve the highest signal to noise ratio.
The output level is from 0dB to 15dB gain. That means the output level never cuts
off the input level.
OPERATION Cont.
Selecting the Delay range
Selecting the delay range is done by moving the shorting jumper on the front
panel to the desired position. Either the long position (MS) for room time delay, or
the short position (
µ
S) for speaker driver alignment.
Figuring the Long Time Delay
Time delay in milliseconds (MS) is figured by adding the DIP switch ON (Switch
Down) positions then add 5.
Example, If the 5 and 80 switches are down, the delay time is
5 + 80 + 5 = 90 milliseconds of delay time.
Figuring the Short Delay Time
In the short position, figure the long time delay time, then divide by 128. For
example, the minimum time delay is 5 milliseconds in the long position. In the
short position it would be; 5 / 128 = 39
µ
S (or .000039 sec). The speed of sound at
sea level is approximately 1100 feet/second. So that would be 1100 x .000039 =
.043 feet, or multiplied by 12 inches = .51 inches.
SCHEMATIC
1
ROLLS CORPORATION
5143 South Main Street
Salt Lake City, UT 84107
1
4-May-1999
Title
Size:
Document Number:
Date:
Rev:
Sheet
of
Rb
D I G I T A L D E L A Y R D 3 2 0
D
-12V
+5V
+5V
+12V
+5V
+12V
+12V
+12V
+12V
-12V
+5V
+5V
+12V
+12V
+12V
+5V
+5V
VCC
VDD
+5V
-12V
-12V
-12V
-12V
-12V
VSS
+5V
+5V
3 2 0 M S
4 0 u S
5
1 0
2 0
4 0
8 0
1 6 0
I N
O U T
+12V
-12V
-12V
-12V
-12V
-12V
-12V
+12V
+12V
+12V
+12V
+12V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
3 2 0
6 4 0
+5V
VREF
+5V
9
18
+5V
7
+5V
14
F O R 1 2 8 0 M S U S E 4 4 6 4
VREF
1 0 K 1 %
R 5
4 7 K
R 6
1 0 K
P 1
1 0 0 K T P
R 7
1 0 K
R 9
1 0 K
R 1 3
1 0 K
R 2 1
1 0 K
R 2 2
1 0 K
R 2 3
1 0 k
R 2 4
1 0 K
R 2 7
1 0 K
R 2 8
5 1
R 3 1
5 1
1
H 2 A
H D 5
R 1 1
1 0 K
R 1 0
1 0 0
R 1
1 0 K
R 4 3
1 0 K
R 4 4
1 0 K
R 4 5
1 0 K
D 1 1
1 N 4 0 0 1
D 1 3
1 N 4 0 0 1
D 1 2
1 N 4 0 0 1
D 1 4
1 N 4 0 0 1
I
1
G
2
O
U 2 2
7 8 0 5
3
H 2 C
R 3 0
1 0 K
I
1
G
2
O
U 2 1
7 8 1 2
I
2
G
1
O
3
U 2 9
7 9 1 2
C 3 4
1 U
C 3 5
1 U
VOUT
1
D11
2
D10
3
D9
4
D8
5
D7
6
D6
7
D5
8
D4
9
D3
10
D3
11
DGND
12
D1
13
D0
14
WR
15
CS
16
VREF
17
AGND
18
VSSA
19
VDDA
20
RA
21
RB
22
RC
23
RFB
24
U 1 9
M A X 5 0 2
A0
14
A1
13
A2
12
A3
11
A4
8
A5
7
A6
6
A7
10
RAS
5
CAS
16
G
1
WE
4
D0
2
D1
3
D2
15
D3
17
U 1 8
4 4 1 6
A0
14
A1
13
A2
12
A3
11
A4
8
A5
7
A6
6
A7
10
RAS
5
CAS
16
G
1
WE
4
D0
2
D1
3
D2
15
D3
17
U 1 6
4 4 1 6
1A
2
1Y
4
1B
3
2A
5
2Y
7
2B
6
3A
11
3Y
9
3B
10
4A
14
4Y
12
4B
13
A/B
1
G
15
GND
8
VCC
16
U 1 5
7 4 H C 1 5 7
1A
2
1Y
4
1B
3
2A
5
2Y
7
2B
6
3A
11
3Y
9
3B
10
4A
14
4Y
12
4B
13
A/B
1
G
15
GND
8
VCC
16
U 1 4
7 4 H C 1 5 7
CLK
1
RST
2
Q1
12
Q2
11
Q3
9
Q4
6
Q5
5
Q6
4
Q7
3
U 1 1
4 0 2 4
P0
4
Q0
6
P1
12
Q1
11
P2
13
Q2
14
P3
3
Q3
2
CI
5
CO
7
CLK
15
PE
1
B/D
9
U/D
10
U 1 2
4 0 2 9
P0
4
Q0
6
P1
12
Q1
11
P2
13
Q2
14
P3
3
Q3
2
CI
5
CO
7
CLK
15
PE
1
B/D
9
U/D
10
U 1 3
4 0 2 9
CLK
1
RST
2
Q1
12
Q2
11
Q3
9
Q4
6
Q5
5
Q6
4
Q7
3
U 7
4 0 2 4
C 1 4
2 5 P F
C 1 2
2 5 P F
C 1 1
1 0 U
D 5
D 6
D 8
D 7
C 3
. 0 0 5 6
C 9
1 U
C 4
. 0 0 1 2
C 5
1 2 0 P F
C 6
. 0 0 5 6
C 7
1 0 U
C 2 0
. 0 0 1 5
C 2 2
1 2 0 P F
C 2 1 . 0 0 5 6
C 2 3
. 0 0 1 5
C 2 5
1 2 0 P F
C 2 4
. 0 0 5 6
R 4 2
1 0 K
R 4 9
1 0 K
D 9
R 2 9
1 0 K
C 2 7
. 0 0 5 6
R 2 6
4 7 K
D 3
1 N 4 1 4 8
R 3 3
1 0 0 K
D 4
1 N 4 1 4 8
R 3 2
1 0 K
1
E 1
1
E 2
1
E 3
R 3 9
1 K
A0
14
A1
13
A2
12
A3
11
A4
8
A5
7
A6
6
A7
10
RAS
5
CAS
16
G
1
WE
4
D0
2
D1
3
D2
15
D3
17
U 1 7
4 4 1 6
R 1 2
7 5 K
1
2
3
4
5
6
7
8
9
U 6
B A 6 1 4 4
D 1
1 N 4 1 4 8
R 1 5
1 0 K
R 1 6
1 0 0 K
X 1
3 . 2 7 6 8
R 3 6
1 M
R 5 1
1 0 K
R E S
R 4 8
1 0 K
D 2
1 N 4 1 4 8
1
2
3
4
J P 1
H E A D E R 4
H D 4
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
S W 1
S W D I P - 8
D I P S W - 8
R 5 3
1 M
C 3 9
1 0 U
R 5 4
1 M
Q 1
J 1 1 3
R 5 5
1 K
R 5 6
1 0 K
C 1
4 7 0 P F
B P 6
5 0 3
B P 7
5 0 3
B P 8
5 0 3
B P 9
5 0 3
B P 1 0
5 0 3
B P 1 1
5 0 3
B P 5
5 0 3
B P 1
5 0 3
B P 2
5 0 3
B P 3
5 0 3
B P 4
5 0 3
B P 1 3
5 0 3
B P 1 4
5 0 3
B P 1 6
5 0 3
B P 1 7
5 0 3
C 3 8
5 0 3
D 1 7
1 N 4 1 4 8
R 3 7
2 K
R 4 7
1 0 K
R 4 6
1 0 K
R 5 2
1 0 K
4
5
H 2 E
H D 5
C 2 8
1 0 U
C 2 9
1 0 U
R 5 0
1 0 K
D 1 5
L D R R
9
8
U 9 D
7 4 H C 0 4
C 8
1 0 U
R 1 8
1 K
DRDY
1
D1
3
D2
4
D3
5
VSS
12
VAA-
16
D8
10
D7
9
D5
7
VAA+
17
D11
14
OEM
15
D6
8
VIN
18
VREF+
19
VREF-
20
STRT
21
VDD
24
OEL
23
D4
6
CLK
22
D0
2
D9
11
D10
13
U 1 0
H I 5 8 1 2
2
3
1
4
U 1 A
4 5 6 0
6
5
7
8
U 1 B
4 5 6 0
2
3
1
4
U 2 A
4 5 6 0
6
5
7
8
U 2 B
4 5 6 0
6
5
7
8
U 3 B
4 5 6 0
2
3
1
4
U 5 A
4 5 6 0
6
5
7
8
U 5 B
4 5 6 0
6
5
7
8
U 4 B
4 5 6 0
R 8
1 0 K
R 2 0
1 0 K
13
12
U 9 F
7 4 H C 0 4
1
2
U 9 A
7 4 H C 0 4
3
4
U 9 B
7 4 H C 0 4
11
10
U 9 E
7 4 H C 0 4
5
6
7
14
U 9 C
7 4 H C 0 4
C 2
1 2 0 P F
C 1 5
1 0 2
C 1 3
1 2 0 P F
R 2
1 0 K
R 1 9
1 0 K 1 %
R 1 7
1 0 K 1 %
C 1 0
1 2 0 P F
R 5 7
1 K
C 3 2
4 7 0 P F
A
1
QA
3
B
2
QB
4
QC
5
QD
6
QE
10
CLK
8
QF
11
QG
12
CLR
9
QH
13
U 8
7 4 H C 1 6 4
R 3 5
1 0 K
R 3 4
1 0 K
C 3 0
1 0 U
P 2
1 0 0 K T P
2
3
1
4
U 3 A
4 5 6 0
C 2 6
1 0 U
R 2 5
4 . 7 K
2
3
1
4
U 4 A
4 5 6 0
C 3 6
1 0 0 0 u f
R 4 0
1 K
D 1 0
1 N 4 1 4 8
R 4 1
1 0 K
C 3 1
4 7 0 P F
C 3 3
1 0 U
C 1 8
5 0 3
2
H 2 B
H D 5
R 1 4
4 . 7 K
R 3
1 0 K
R 4
1 0 K
+5V
