Audio Outputs
Connect a loudspeaker with an impedance of 4 to 16 Ohms to the terminals marked Spkr + and Spkr-.
For maximum output, use a 4 Ohm loudspeaker.
WARNING: DO NOT CONNECT EITHER LOUDSPEAKER OUTPUT TERMINALS TO GROUND
You may alternatively connect an external amplifier to the Line out terminal and GND if required.
Note: The volume control should generally be set to between 25 and 50% to achieve 0dB output.
Run out
This output can be used to control an external device such as a relay.
The output will pull to ground when an audio track is playing and will be open circuit when no audio is
playing.
If driving a relay, you must fit a diode across the relay coil to suppress back EMF.
Maximum capacity is 30V at 500mA.
Indicator LEDs
Play LED (Blue)
This LED will be lit under the following conditions:
Normal
operation.
This LED will be lit when audio tracks are playing.
This LED will flash if either the random or fixed timer is running while no audio is
playing.
File
loading.
The Play LED will light when the USB port is transferring data to the DSU500.
The USB cable should not be disconnected while this LED is lit and for 5 seconds
after the LED has gone off.
Firmware
update.
The Play LED will light while the firmware is being written to the internal flash
memory.
Status LED (Red) Lit when the power is on.
This LED will flash a number of times to indicate an error code under the following
conditions.
Primary error codes.
1.
Not
used.
2.
File not found. (check naming is correct)
3.
Incorrect file format. (Not Microsoft ADPCM)
4.
File not encoded as MONO
5.
No data chunk in file
6.
Bits per sample wrong, must be 4
7.
Sample rate above 48KHz
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