EM21B User`s Manual
Contents
1. on a 32GB SDHC card Supply Voltage 10 15 VDC regulated Typical Standby Current 120 mA Physical Dimensions 3 1 x 2 8 x 1 3 excluding mounting ears Firmware Revision 1 8 Typical Wiring Diagram 0 Q L LINE OUT JACK LEFT SPEAKER SPEAKER COMMON RIGHT SPEAKER POWER GROUND TRIGGER BUSY POWER SUPPLY PUSH BUTTON MOTION SENSOR VOLUME KNOB Device Voltage In gt RELAY Device Voltage Out OPTIONAL Line Out Jack This 3 5mm phone jack provides single ended output for headphone or power amplifier Speaker Outputs The speaker outputs are single ended Load impedance is 4 to 8 Ohms Power amp Ground Be sure the supply voltage is within the specifications or the unit may be damaged Trigger Input Depending on the operation mode the playback is activated by making or breaking the contact between this input and the ground Busy Output This open collector output is activated during audio playback Maximum load is 100 mA This output can be used to turn on an external relay that further controls a device such as a motor or a light Volume Knob Turn the knob clockwise to increase the output level It affects both the speaker output and the line out SD Card Both SD FAT16 and SDHC FAT32 cards are supported Files on the flash card should be properly numbered see Numbering Files section Be sure to turn the unit off before Ins2. Q Mode The Q mode is disabled by default and enabled by adding a letter Q as the fourth letter in the configuration file MODE TXT In the Q mode the left channel output is inverted For stereo files this creates a virtual surround For mono files this creates a more powerful differential output but the speaker 8 Ohm recommended for this mode must be connected to the LEFT and the RIGHT terminals instead of the LEFT and the COMMON terminals Application Notes just want it to play a sound when the button is pressed Do the wiring according to the Typical Wiring Diagram but skip the optional relay Name the sound file 001 mp3 and copy it to the flash card Insert the card into the system and it s ready to work If you want to play different files sequentially one per trigger just name the rest of the files 002 mp3 003 mp3 and so on Random Play Random Play can be achieved by using either the DIC mode for normally open contacts or the DIO mode for normally closed contacts The randomness is actually created by the variation in the duration of the momentary opening or closure of the contacts For example pressing a normally open push button in the DIC mode will apply a constant trigger to the unit causing it to play a file However before the file can be played the unit gets interrupted by the same constant trigger and tries to play the next file This interrupting process goes on until the push button is relea
3. erting the card face up To remove the card push it again Numbering Files Sound files must be numbered consecutively starting from 001 even if only one file is used The 3 digit file number must be added at the beginning of the filename e g 001 Anyname mp3 Sound files are played according to the numbering sequence The first trigger plays file 001 the second trigger plays file 002 and etc When the next file number is missing the sequence restarts from 001 System Configuration The system can be easily configured with a simple text file called MODE TXT on the flash card If there is no MODE TXT on the flash card the system will operate in the default mode DNC Put one of the following modes three letters in the M ODE TXT file In this document the contact means the connection between the trigger input and the ground If you want the playback to be non interruptible DNC default mode Play the file once when the contact is closed If the contact is still closed when the playback finishes the next file will start to play immediately DNO Play the file once when the contact is open If the contact is still open when the playback finishes the next file will start to play immediately DNM Play the file once when the contact makes open then close After the playback finishes the contact must open then close to play the next file DNB Play the file once when the contact breaks close then open Af
4. sed At that moment the unit is free to play whatever file it happens to land on Random Play is not available when the unit is in the Timer Mode DC Voltage Triggering The diagram to the right illustrates the internal circuitry of the trigger input The input is considered OPEN when the trigger is either floating or higher than 2 7V The input is considered CLOSED when the trigger is at or near zero volt ground This design allows most devices with DC voltage output to be used 10K for triggering but there are some exceptions For example the output from certain security alarms stays float TRIGGER ing no voltage when not triggered and rises to 12V or 24V when triggered To our system it is always considered OPEN T In this case an external relay can be used to provide a contact closure for triggering EM 21B User s Manual Technical Specifications Audio Quality CD quality mono stereo Max Output Power 6W mono files in the Q mode or 3W per channel Supported File Types MP3 ISO 11172 3 compliant Trigger Input One input for push button motion sensor or DC control voltage Max Number of Sound Files 99 Flash Card Type Both SD FAT16 and SDHC FAT32 cards are supported Mini and micro SD cards are also acceptable if an adaptor is used Max Flash Card Capacity 2GB for SD 32GB for SDHC Max Recording Time About 34 hours of 128Kbps M P3 audio on a 2GB SD card About 544 hours of 128Kbps M P3 audio
5. ter the playback finishes the contact must close then open to play the next file If you want the playback to be interruptible DIC Similar to DNC but the playback can be interrupted by opening then closing the contact DIO Similar to DNO but the playback can be interrupted by closing then opening the contact DIM Similar to DNM but the playback can be interrupted by opening then closing the contact DIB Similar to DNB but the playback can be interrupted by closing then opening the contact If you want the playback to stop as soon as the trigger is removed DHC Similar to DNC but the playback stops as soon as the contact is open If the contact is still closed when the playback finishes the next file will start to play immediately DHO Similar to DNO but the playback stops as soon as the contact is closed If the contact is still open when the playback finishes the next file will start to play immediately DHM Similar to DNM but the playback stops as soon as the contact is open If the contact is still closed when the playback finishes the next file will not start to play the contact must open then close to play the next file DHB Similar to DNB but the playback stops as soon as the contact is closed If the contact is still open when the playback finishes the next file will not start to play the contact must close then open to play the next file Timer Mode The system can be made to automatically play at preset fi
6. xed intervals This is called the Timer Mode which is configured by using Txx for the configuration letters where xx is a two digit number specifying the interval in minutes For example T60 sets the interval to 60 minutes so the system will automatically play a file every 60 minutes starting from file 001 Although the Timer M ode does not require manual triggering you can still manually trigger the system when it s idle In the idle period the system works as if it s in the DNC mode After the system fullfills the manual triggering the idle period resets restarts from the beginning
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