A tiny sound card based on the Covox Speech Thing design.
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README.md
pcb-covox-bom.ods
pcb-covox.brd
pcb-covox.sch

README.md

pcb-covox

A tiny sound card based on the Covox Speech Thing design. I have another design which adds on an LM386 amplifier which can be found here.

##PCB Design software and addons used

  1. Eagle 7.5.0: I use Standard but Light should still be able to open/modify the files.

##Images Screen This is a revision 3 board which has a bug in the mj2135 library which is a misaligned hole. I corrected this in Revision 4 but never actually fabricated that update.

Due to my oversight, only the DB25 pin 19 is grounded whearas the standard calls for pins 18-25 to be done so. You might need to modify the design if you face problems.

##Schematic drawings Images are exported from Eagle at 600dpi.

Screen

Screen

##Parts required Use Libreoffice to open pcb-covox-bom.ods

##References

  1. Hardware implementation references
  2. Design reference
  3. MJ-2135 package obtained from coqui-dip