What is the missing component?

Industry guru Forrest M. Mims III has created a stumper.

Video game designer Bob Wheels needed an inexpensive,

counter-clockwise rotation detector for a radio-controlled car

that could withstand the busy hands of a teenaged game player

and endure lots of punishment. Can you figure out what's

missing? Go to www.Jameco.com/unmask to see if you are

correct and while you are there, sign-up for our free full

color catalog.

1-800-831-4242