A tiny sound card based on the Covox Speech Thing design which includes an LM386 amplifier.
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README.md

pcb-covox-amp

A tiny sound card based on the Covox Speech Thing design which includes an LM386 amplifier. I have another design that just has the resistor ladder portion only without the amplifier which can be found here.

##PCB Design software and addons used

  1. Kicad 4.0.2 or later

##Video

Due to copyright problems in the music used, this video can only be viewed on a PC. It is blocked on mobile devices and other platforms.

##Images Screen

The picture is of the Rev 2 version with the bug in the limited parallel port grounding. This has been corrected in the Rev 3 gerber but not fabricated.

##Schematic drawings

Screen

Screen

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

##References

  1. Hardware implementation references
  2. Design reference
  3. MJ-2135 package referenced from coqui-dip
  4. Amplifier circuit