Imported from GitHub: yeokm1/pcb-covox-amp · commit 69ce036 · license MIT

Description

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

README

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

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

Parts required

Use Libreoffice to open pcb-covox-amp-bom.ods

Errata

As reported in this issue, there is a mistake in components R2 and C6. As I'm not currently using this project, I'll not be correcting this error.

References

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