[Tim Skloss]

What exactly are the limitations on using the $100 worth of "electrical components" from DigiKey?

Do ALL of the components need to be in the gray box?

Do ALL of the components need to be on the circuit board?

We want to measure shaft speed with a hall-effect sensor. We want to put the sensor near the shaft, but if the components must be in the box (or on the CB) then that presents a problem. One way around this is to use strong magnets on a nearby shaft, sproket or gear that can trigger the sensors in the box. But this approach requires all measured shafts to be in close proximity to the gray box.

Has anyone tested this ruling?

On another note, I consider CB fabrication and any other parts from DigiKey that are explicitly listed in the Additional Parts List as falling outside the $100 limit. Only non-listed components from DigiKey should fall under the $100 limit.