June 2015 - Ed.2.1
Audio over IP decoders E411, E413, E415 & E417 technical manual
Page 12
3.8
Audio inputs
The E417 model has two audio inputs that can be used as a local audio source: a stereo line level and a mono
microphone level.
3.8.1.
Mic input
The microphone input connector (
) is a 3.5 mm 3-terminal Jack.
The simplified schematic is shown in the figure:
3.3V
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Figure 8: Microphone input
The maximum input level is 143mVpp, with an impedance of 45kΩ.
The input accepts directly the standard microphones designed for computers.
3.8.2.
Line input
The line input (
) is a stereo RCA, with a level of 2.5Vpp and an impedance of 80kΩ.
The white connector is the left channel and the red, the right one.
3.9
USB connector
The E417 has a type A USB connector (
) to connect a mass storage device to store audio files that can be
decoded and played locally.
It’s an USB 2.0 interface that supports devices formatted in the FAT32 file system, with a maximum capacity
of 64 GB.
It is very important to not unplug the USB memory while it is in use to avoid file corruption or even its
destruction.
The device is accessible through the network using the FTP protocol to change its content remotely
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