From the new timetable starting 10 December, there will be a train every 10 minutes for most of the day between Amsterdam and Eindhoven, via Utrecht and 's-Hertogenbosch, 7 days a week. Well, strictly speaking two of those 6 trains per hour go to/from Schiphol, but they also stop at Amsterdam Zuid, so they are still between Amsterdam and Eindhoven. Also, if you are going to/from Amsterdam Centraal, you can change at Utrecht where there is a tight connection with the train to/from Schiphol with cross platform interchange, meaning it takes the same time whether you change or not, give or take one minute.
From Eindhoven, the trains run at 07, 17, 27, 37, 47 and 57 minutes past each hour. From Amsterdam Centraal, they are at 05, 14, 24, 35, 44 and 55 minutes past each hour, so in that direction there is a slight deviation from the 10 minute interval.
From Eindhoven, the trains run at 07, 17, 27, 37, 47 and 57 minutes past each hour. From Amsterdam Centraal, they are at 05, 14, 24, 35, 44 and 55 minutes past each hour, so in that direction there is a slight deviation from the 10 minute interval.