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Redback® A 1760 Microphone Delay/Mic-Line Recorder
3.0 FRONT PANEL GUIDE
Figure 1 shows the layout of the A 1760 front panel.
A 1760
Microphone Delay
24V
DC In
24V
DC In
-
+
1
2
1
24V DC input
Connects to a 24V DC Plugpack with 2.1mm Jack
to provide power to the unit. A 24V DC plugpack is
supplied with a connector to suit.
2
24V DC Input (Backup)
Connects to a 24V DC backup supply with at least
0.5 amp current capacity. (Please observe the
polarity)
3
PTT (Push To Talk) Trigger
This trigger operates in parallel with the PTT switch
on the Mic In XLR connector and the PTT switch.
This is a set set of voltage free closing contacts.
Keep the lines short to avoid false triggering.
4
PTT (Push To Talk) Switch
This switch is used to trigger recording and
operates in parallel with the PTT switch on the Mic
In XLR connector and the PTT trigger.
5
Music Input
This input is a 3.5mm Line level (1Vpeak audio)
stereo socket input which can be used to
connect an audio source which can be recorded
when the unit is in Audio Recorder mode (refer to
section 5). When connected this input will
disconnect the Microphone audio input. The XLR
PTT is still functional.
6
Microphone Input
This Mic input is a 5 pin XLR with a 3mV rms
sensitivity and a closing contact PTT switch which is
used to trigger recording.
Pinout details are shown in figure 2.
4.0 REAR PANEL GUIDE
822
onnector
Mic In XLR 5 Pin Wiring
Push
5
1
4
3
2
Figure 3 shows the layout of the A 1760 rear panel.
2
Redback® Proudly Made In Australia
5
1
4
2
3
Push
PTT
BALANCED
AUDIO
PTT
PTT
Trigger
Switch
Music In
Mic In
3
4
5
6
Fig 1
Fig 2
Altronics P 0822
5 Pin Male XLR Connector
Configuration
1 - Earth/Shield
5
1
2 - Signal Hot
4
2
3
3 - Signal Cold
4 - PTT switch
PTT
BALANCED
5 - PTT switch
AUDIO
1
Mic Output
DIP Switch Settings:
1
2
1
2
OFF OFF
3
OFF OFF
ON OFF
ON OFF
COLD HOT
ON ON
ON ON
1
2
Output
3
Active
Mic Out
N/O
Contacts
1
2
This is
Mic level (3mV rms audio) output from the
unit. This output can only be active when used in
Mode 0 or Mode 1 and Mode 3 when option 1 is
active (Refer to section 5 for more details). The
connection is a 3 Pin XLR with the pinout details as
shown in figure 4.
2
Output Active Contacts
The unit has a voltage free closing contact output
(Normally Open) which is active whenever the unit
is playing audio through its output. The output
can only be active when used in Mode 0 or Mode
1 and Mode 3 when option 1 is active (Refer to
section 5 for more details). The contacts are rated
at 0.5A 24V.
3
Activity LED
This LED indicates the status of the unit.
BLUE : The unit is ready and waiting for a trigger
to start recording.
GREEN : The unit is recording.
GREEN & BLUE : The unit is playing back recorded
FLASHING RED 0.5s on - 0.5s off : No SD card
RED: Unit is busy. Situation will self-clear within 2s.
4
DIP Switches
These switches are used to set the Mode of
operation and Chime and Audio Output options.
Refer to section 5 for more details.
5
Micro SD Card
This is used to store the audio recordings and the
chime/message audio files. (More details in
section 5).
Mic Out XLR 3 Pin Wiring
Configuration
1
2
3
5
1
4
3
2
Fig 3
Function
3
4
Microphone Delay without chime
OFF OFF
Microphone Delay with chime
ON OFF
Microphone Recorder without Audio output
OFF OFF
ON OFF
Microphone Recorder with Audio output
Music Recorder without Audio output
OFF OFF
Music Recorder with Audio output
ON OFF
Ready
DIP
Recording
Switches
Playing
Micro
Busy
ON
SD Card
No SD Card
1 2
3
4
1 2 3 4
Activity
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3
4
5
audio.
present.
1 - Earth/Shield
2 - Signal Hot
1
2
3 - Signal Cold
3
COLD HOT
Fig 4
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