Manual rev. C
Product Overview
This audio board allows triggered or continuous playback of WAV and MP3 audio files.
It can be triggered by a switch (not included), motion sensor (not included), or any DC voltage from 3.3V
up to 24V.
When triggered it can play back a single track or the next track. You can also have a track which plays
continuously and then when the unit is triggered it will pause the playback of that track, jump to a
specific track and play it, and then return to the previous track and continue playing it.
In continuous mode it can play the same track over and over, loop through all the tracks, or playback the
tracks in random order.
It has a built in 3 Watt mono amplifier that can connect directly to a speaker and a stereo line-out jack
for sending the sound to an external amplifier or amplified speakers (such as the type you connect to
your computer).
In addition, we have included a DPDT relay (two electronic switches that can turn one thing off while it
turns another one on) on the board so you can switch other things on or off when your triggered sound
plays!
Techinical Specifications
•Power Requirements: 9-12VDC, barrel connector is center positive, 2.1mmx5.5mm mating
connector.
•Supports FAT16 and FAT32 file system on the uSD card (not included).
oSupports maximum 32GB micro SD (uSD) card.
•WAV and MP3 Decoding
oMP3
oSupports 11172-3 and ISO13813-3 layer3 audio decoding.
oSampling rates (KHz): 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, and 48.
•24-bit DAC output and supports dynamic range 90dB and SNR 85dB.
•Supports 3000 audio files under the root directory of the storage device.
•Built in 3W mono amplifier that can directly drive a speaker.
•PCB is designed to fit a Hammond 1591XXASFLBK case.
•Relay Technical Specs:
oMax Switching Voltage: 220VDC, 250VAC
oRated Current: 5A, Please note the graph below as DC switching current capability goes
down as voltage goes up. So, at 12VDC you can switch 5A, but at 20VDC only 3A etc.