DM3028A/EM3028A
Contents
1. Endosure Specifications Operation playback only File Format Windows wav PCM mono 16 bit 22 05 or 44 1 KHz Maximum Number of Sound Segments Direct M ode 8 Binary Mode 128 Sequential M ode 128 Memory Type CompactFlash card type 1 5V 8 128 MB Supply Voltage 10 32 VDC Audio Output 40W 8 Ohm load bridged output DM 3028A Dimensions 5 6 x 4 2 EM 3028A Dimensions 6 0 x 4 8 x 1 7 Direct Mode default Plays up to 8 different sounds Sound 1 first priority is activated by triggering T1 sound 2 second priority by triggering T2 and so on If multiple triggers are applied at the same time only the sound with the highest priority will be played Binary Mode Plays up to 128 different sounds To activate a certain sound apply its file ID number on T1 LSB to T7 MSB with 1 5V and 0 OV Then pulse T8 low to start the playback The file ID number can be removed after the triggering pulse returns to high 5V The file ID number for sound 128 is 0000000 Sequential Mode Plays up to 128 different sounds Sounds are activated sequentially by triggering T1 Sound 1 is played the first time sound 2 the second time and so on The sequence starts from 1 again when the next sound is absent Normal Mode default In this mode the sound starts as soon as the trigger goes low No sound can interrupt the playback A new sound can start only after the current sound is finishe2. DM3028A EM3028A TabetodirgGi 1 How to change the filename extension of a wav file In order to change the wav filename extension you must first force Windows to show it Refer to your Windows manual for instruction on how to do it The follow ing procedure is specific to Windows 2000 a Select Start gt Settings gt Control Panel and double click Folder Options In Windows 98 the Folder Options is under Start gt Settings b Click the File Types tab scroll down the list to find the WAV extension high light it and click Advanced click Edit if in Windows 98 c Check the box for Always show extension and click OK d Click Close to complete the procedure Now you can right click the file icon and select Rename to rename it If you get a warning message saying If you change a filename extension the file may be come unusable Are you sure you want to change it click Yes 2 How to create the CFG configuration file The easiest way is to use NotePad a Windows accessory Type in the configura tion letters and use Save As to save the file In the Save As window select the proper folder for Save in select All Files for Save as type and enter CFG for File name where can be any name with up to 8 letters Certain versions of NotePad also have an Encoding section for which you should select ANS
3. I The CFG file should then be copied onto the CF card If the CFG file is missing or incorrect the board will operate in the DN mode 3 There are popping noises throughout the playback This will happen if the speed of the CF card is too slow Try to use a faster CF card or re digitize the sound files at a lower sampling rate 4 Possible causes for no sound and wrong sound a The sound file doesn t have the correct filename extension b The board is in the wrong operation mode due to missing incorrect CFG file c If the CF card is inserted when the power is on the board will not work To solve this problem turn the power off for a few seconds If this action does not fix the problem make sure the sound files are still on the CF card d Some CF cards especially if they have been used in digital cameras have a non standard format which can not be read by the board In this case reformat the CF card to the standard DOS FAT format and copy the wav files again 5 Possible causes for trashy sound and sound too fast slow a Unsupported file formats such as 8 bit resolution and ADPCM compression will produce trashy sound Re digitize or convert the sound file b Unsupported sampling rates will produce sound too fast or too slow Re digitize or convert the sound file c Trashy sound will occur if the sound is stereo instead of mono DM3028A EM3028A Us sMna EM3028A DM3028A Circuit Board Metal
4. d Looping is possible by holding the trigger low constantly Interrupt Mode In this mode the sound does not start until the trigger goes high Any sound including the sound itself can interrupt the playback The playback will be stopped as soon as the interrupting trigger goes low but the new sound will not start until the trigger goes high Looping is not possible in this mode Hold Mode In this mode the sound plays only for as long as the trigger is held low The playback is not interruptable Looping is possible in this mode DM3028A EM3028A IrddldinGice Typical Wiring Diagram PWR O T8 T7 T6 T5 T4 T3 T2 T1 RS BY GD VD SP SP LINE VOL 10 30V DC POWER SUPPLY Terminal Block Descriptions Power Input VD amp GD VD is voltage and GD is ground Use a well regulated power supply to obtain the best sound quality A higher input voltage will generally produce more output Speaker Output SP amp SP The speaker output is a bridged balanced output One or more speakers may be connected to the output but the equivalent impedance should be 8 16 Ohm Additional heat ventilation may be required to obtain maximum output The built in power amp has internal current limiting and thermal protection Busy Output BY This output is internally pulled up to 5V through a 10K resistor R12 It drops to OV 100 mA current sink when the board is playing Remove R12 for open collector Reset Input RS Connect this input to the g
5. ired operation modes you must copy to the CF card an ASCII text file named CFG can be any name with up to 8 letters which contains one and only one of the following two letter word DN Direct Normal DI Direct Interrupt DH Direct Hold BN Binary Normal BI Binary Interrupt BH Binary Hold SN Sequential Normal SI Sequential Interrupt SH Sequential Hold If the CFG file is missing or incorrect the board will operate in the default DN mode The CFG file is read by the board upon power up and reset The sound file s sample rate is automatically detected by the board Sound files on the same CF card may have different sample rates For example some sound files may be 22 KHz and some sound files may be 44 KHz
6. round to reset the board Minimum reset duration is 100 ms The current playback if any will be stopped immediately Trigger Inputs T1 T8 Either a negative pulse 5V to ground or a momentary contact closure to the ground can be used for triggering Minimum trigger duration is 100 millisecond Power Light PWR The power light should be on when power is applied Volume Pot VOL Turn VOL clockwise to increase the output volume It affects both the speaker output and the line output Line Output LINE This RCA jack provides unbalanced output for external amplification Output level can be adjusted by turning the volume pot CompactFlash Card Programming A CompactFlash CF card reader must be used to read and write CF cards The reader connects to the USB or the parallel port of the host computer and operates like a floppy drive Simply copy the wav sound files onto the CF card However you must change the wav filename extension to a 3 digit file ID number For example lion 001 indicates that it s sound 1 and frog 128 means it s sound 128 The order in which these files are written to the card is not important Files with invalid filename extension are ignored When using the sequential mode make sure there is no break in the file ID number because the playback sequence will reset to sound 1 when a break of file ID number is detected Operation Mode amp Sample Rate Configuration To select the des
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DM3028A/EM3028A