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ISD2560 DIGITAL SOUND BOARD

Direct Connection to 2.XX and 5.XX Main Boards

READ THE ISD-PCB ERRATA (below) for Rev-B Boards !!!

PCB CAD FILE: ISDRevC.pcb  (download software @ www.expresspcb.com)  NEW

Very compact design.  Powerful audio amp with volume control, can directly drive 8 ohm speakers.  

This circuit can be optionally added to the MilesTag 5.XX or 2.XX Main Boards to allow use of realistic sounds for the various system functions (firing, reloading, etc.).  

Wav files can be programmed into the ISD2560 chip using a DIY ISD Sound Recorder application (see FragTag website for details).  The sound quality can be very good as long as you understand the limitations of the ISD chips and are careful about selecting suitable sounds.  A little experimentation goes a long way, so you should take time to get familiar with the ISD2560 documentation and spec sheets that are available from Winbond's web site.  I highly recommend using your favorite audio editing software to adjust the relative levels of the sounds and to perform other editing, filtering and fine tuning of the sounds as required.

I have posted some example sounds, but you are encouraged to come up with a unique sound set of your own.  You can use realistic sounds, sci-fi noises or a combination of either.  Extracting wav files from computer "FPS" games is a popular method of finding suitable source material.

Note: Please be aware that the list of required sounds (and their order) may change in future code updates.

ISD-PCB (Rev-B) Errata

The Rev-B ISD PC Boards contain 2 errors that MUST be observed/corrected in order for the circuit to work properly (on pre-assembled boards, these errors are already corrected):

1.  The polarity of capacitor C2 is incorrectly labeled on the PC board.  C2 is a 220 uF polarized electrolytic capacitor.  The positive lead (+) should be connected to the pad closest to the LM386.  The negative lead (-) should be connected to the pad closest to the speaker connector (SPKR).

2.  There is a missing GROUND trace on connector J1.  To correct this, the J1 pin labeled "G" must be connected to the ground pin of capacitor C1 using a small solid wire jumper.  Be careful that jumper does not short to any other pins!