It turns out CUI has updated their power supply lineup, so we have a choice between the PSK-S3 series (either 5v or 12v) and the PSK-P5B series. The two are pin-compatible. The Hydra doesn't need more than 3W, but I may decide to just stock the 5W for common use with both the Hydra and OpenEVSE II.

One nice thing is that we can get rid of the extra 400V "intermediate" cap that we had to add for the old VSK supplies.