Just Another LPT DAC

• Introduction
• Design
• Schematics (Kicad and Gerber files)
• Build
  • Option #1 (MODPLAY PRO Recommendation)
  • Option #2 (COVOX)
• Pictures and videos
• References

JALPTDAC is a minimalist LPT R-2R DAC that could be assembled within a DSUB-25 connector case. The initial design was inspired by the 1994 COMPUSOUND interface. The latter appears to be an implementation of the MODPLAY PRO Hardware recommendation:

The design is somehow flexible, allowing you to choose from several alternatives:

1. Solder a cable to the output and enclose the PCB within a case (like COMPUSOUND)
2. Add a 3.5 female plug connector (and use it without the case)
3. Implement MODPLAY PRO approach (R = 10K)
4. Implement original Covox design (R = 100K)

You can find Kicad files under ./kicad folder, and Gerber files can be found here.

You will need to use high precision resistors (>= 1% tolerance).

Note: If you decide to use a 3.5 female plug, you can choose between mono and dual-mono output; for dual-mono just short R18 (or add a 0 Ohms resistor)

Wiki section includes some pictures and examples.

• The Covox Years
• DOScember Making Covox/DAC Hardware and Software
• Silly Sound Bastard

Special thanks to: Scali, CallousCoder, & Necroware