I have been working with the Hydra board for over a year now, and in that time I have seen 3 different revisions each time we buy. I started with 1.2, then I got 1.2b, and now I have heard direct from GHI that there is a 1.3 version. The problem is that the new schematics and layout are not available on the website, and the designs are different. Rev 1.2b has at least 1 additional cap, C6, shown in the picture below. And I was told 1.3 has another ground layer.
Has anyone else noticed this? Have you received any sort of update from GHI saying that the design has changed? Does anyone have the 1.2b or 1.3 schematic, BOM, and layout?
We found this only because we tried to test our system that uses the Hydra for FCC Class A EMC compliance, and it failed. There is a 100MHz clock signal coming off the Hydra leaking all over the system. It originates between the MCU (IC5) and the memory (IC4). There is a capacitor, C6, on this line but it’s not in the schematic or layout.
Any advice would be greatly appreciated.