levels are not effected by a serial volume
command, DMX-512 volume command, or
full or half muting command from the trigger
inputs.
In this example, a pre-amplified (or line level)
microphone is fed into the mixer inputs of the
Sd-25
. The ‘Push to Talk’ button on the
microphone is fed into the ‘b’ input of the
Sd-25
. The
Sd-25
is configured to ‘duck’ the
audio from Sd the card to a lower level when
it sees a closure on the ‘b’ input. When the
microphone button is pressed, the
Sd-25
ramps the prerecorded audio down to a
lower level, and the microphone is used to
make an announcement. When the ‘PTT’
button is released, the prerecorded audio
ramps back up to the normal playback level.
12-24 vdc
Power
Level
Sd-
Left
Line In
Level
Line In
Level Level
Sd-
Right
Mixer
Right
Mixer
Left
Audio Repeater/Amp
Gilderfluke & Company
Burbank, California
Sd-25
w/DMX
B
Left
Right
Power
12-24
vdc
A
Trigger
Inputs
Speakers
(8
Ω
)
Running
Status
Pre-Amp
'PTT' Switch
PreAmp
Modulation LEDs:
The two ‘modulation’ LEDs, which are
located in front of the speaker screw
terminals, blink to show audio as it is being
reproduced. They pick up the audio signal
coming from the repeater before the two
volume control pots, so they are not affected
by adjusting these pots or by the auxiliary
‘mixer inputs. Reducing the audio level
through one of the ‘ramping’ functions will
reduce the intensity of these LEDs. Audio at
too low a level will cause these LEDs to
completely extinguish. Normalize your audio
before loading it on the
Sd-25
so that it is
near 100% modulation.
Sometimes additional safety system
assurance above and beyond monitoring the
‘Status’ Relay Output output is needed to
confirm that the
Sd-25
is actually playing. An
external solid state relay or optoisolator can
be attached in place of these LEDs. The
safety system can then monitor this to
confirm that an audio signal is indeed being
generated. Contact Gilderfluke & Company
for more information on this sort of
application.
‘Status’ Relay Output:
A single solid state
r e l a y o u t p u t i s
available for remote
monitoring of the
Sd-25
. It is ‘on’ only
w h i l e t h e
S d - 2 5
i s
playing a triggered or
‘foreground’ SoundFile. It
is not active while stopped
o r w h e n p l a y i n g a
‘background’ looping
SoundFile. It can be
u s e d t o c o n t r o l
ducking mixers, relays, or
whatever you need.
This output is a solid state relay output,
which is rated for up to 250ma at up to 24
Volts of AC or DC. Like the trigger inputs,
this output is not polarity sensitive. Unless
whatever you are controlling is polarity
sensitive (like the input to a larger solid state
relay or an LED, as shown in the
illustrations), you can ignore power supply
Right
Power
12-24
vdc
A
Trigger
Inputs
Speakers
Running
Status
B
Right
Power
12-24
vdc
A
Trigger
Inputs
Running
Status
Isolated
Power
Supply
Gilderfluke & Co.• 205 South Flower Street • Burbank, California 91502 • 818/840-9484 • 800/776-5972 • fax 818/840-9485
Sd-25 w/DMX Manual • page 15 of 40 • © July 21, 2017 • Gilderfluke & Co. • DCM
