User Manual

www.redbackaudio.com.auRedback® Proudly Made In Australia16
Redback® A 4275C/85C 125/250W Mixer Amplier
Setup
2.6 PTT and 24V DC Switched Output
24V DC is available as a switched output to control external devices like remote volume controls with bypass relays for
emergency paging or evacuation strobes (when powered from an external 24V supply). Please note: The 24V DC switched
output has a maximum current draw of 1 amp and is internally thermal fuse protected.
Fig 2.6 demonstrates the connection of a strobe to the 24V DC output. As the current draw of the strobe may be more
than 1amp a relay board is used to switch an external power supply. The Redback S 4444 24V Relay Board as shown is
an inexpensive and easily installed option designed for this purpose.
To enable the switched output, switch 1 on DIP5 must be set to the “ON” position.
The 24V DC ouput is activated when the PTT terminals shown on the rear of the unit (see Fig 2.6) are shorted together or
when any priority/VOX is activated. The PTT is normally done with the switch of a push to talk microphone as shown in
Fig 2.6.
Fig 2.6
4 -16Ω70V100V
OUTPUTS
L
R
24V DC IN
Balanced Mic
+
_
PTT
(short to
activate)
Power Fail
(Contacts
close on
power fail)
SendReturn
Tape Out
Preamp Out
Link To Charge
Backup battery
Input 1Input 3 Input 2Input 4Input 5Input 6
ALERT - EVAC MODULE
Output Levels
Voice Chime Alert
Over & Evac
EV
COMCANCH
AL
Triggers
L
R
+
–
Rem. Vol
Connect
to 1KΩ Pot
+
–
+
–
+
–
Line
24V DC
Switched
Output
DIP 5
Interface
DIP 4
DIP 1
DIP 2DIP 3
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Mic
Line
Balanced Line
L
R
L
R
L
R
L
R
L
R
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
2 1
3
1 2
3
1 2 3 4 5 6 7 8
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
230V AC @ 50Hz
www.altronics.com.au
RESETTABLE
DC FUSE
Made in Australia
by Altronic
Distributors
Pty Ltd
DIP 5
DIP 4
IMPORTANT NOTE
Ensure power is switched OFF when
adjusting DIP switches. New
settings will be effective when
power is switched back on.
DIP 3
SW Item On Off
1
2
Input 6 Level 1V 100mV
3
Not USed
4 Input 5 Level 1V 100mV
Not USed
1
2
3
4
DIP 2
SW Item On Off
Input 4 Level 1V 100mV
Not USed
Input 3 Level 1V 100mV
Input 3 Priority On Off
*
DIP 1
SW Item On Off
1
2
Input 2 Level 1V 100mV
3
Input 2 Priority On Off
4 Input 1 Level 1V 100mV
Input 1 Priority On Off
*
*
SW
Item On
Off
1
2
3
4 Not Used
Not Used
Not Used
Not Used
DIP 4
DIP 1
DIP 2DIP 3
SW
Item On Off
Switched 24VDC Out On Off
Phantom Power Input 6
On Off
On Off
1
2
3
4
Phantom Power Input 5
On Off
5
Phantom Power Input 4
On Off
6
Phantom Power Input 3
On Off
7
Phantom Power Input 2
On Off
8
Phantom Power Input 1
Preamp Out
†
Post
Pre
†
Sets the Preamplifier output to
Pre or Post Master.
DIP 5
Priority or VOX muting is only
functional on inputs 1-3. When
VOX is enabled on input 1 it will
override all other inputs includ-
ing the Alert/Evac Module. VOX
enabled on input 2 will override
inputs 3-6. VOX enabled on input
3 will override inputs 4-6.
If the Alert/Evac module is fitted
it will override inputs 2-6.
*
Model
125W
5AAC Fuse
250W
7.5A
AC Fuse Ratings
RISK OF ELECTRIC SHOCK
OPEN BY QUALIFIED
PERSONNEL ONLY
!
CAUTION
Attenuator fitted with
over-ride relay
Evacuation strobe
Balanced
Audio
PTT
5
1
4 2
3
DIP5 - Switch 1 set to “ON”
to enable 24V DC
switched OUT.
5 Pin Microphone
with a PTT switch.
+24V
GND
24V Relay Board
(Redback S 4444)
N/C1
N/C2
N/O2
N/O1
COM1
COM2
External
24V DC Supply
+24V
GND