The A429USB receiver is a self-contained interface for recording ARINC 429 avionics data in real time. The unit is plug-and-play and will automatically detect and record both high speed and low speed ARINC 429 data. Recorded data may optionally be filtered by label or SDI. An RGB LED indicates receiver status and every message is time-stamped with a 1ms resolution. The A429USB includes over-current and ESD protection to ±30kV.
My ARINC 429 to USB receiver has been using a proprietary front end chip made by Holt IC. This is expensive and locks me into a single-source supplier (it's the most expensive part on the board, even more expensive than the FPGA!). I've been working on removing the Holt receiver and replacing it with a discrete front end. I have now completed a design and successfully tested it. Although it uses slightly more board space, my discrete design is much cheaper and even out performs the Holt chip in terms of it's ability to handle DC offsets so I am very happy.
Here is an example of my discrete front end receiving low speed (12.5k) ARINC 429:
And here is an example of my discrete front end receiving high speed (100k) ARINC 429:
Lately I've been working on converting the original double-sided board into single-sided. This project is starting to become popular on Tindie and I'm selling quite a few, so reducing the manufacturing time has become important. Moving from double-sided to single-sided has increased the size of the board slightly, but it's still small enough to fit two on a 50x50 panel. As of Feb 2020, all new orders will receive the single-sided version.