A Molecular Amplification Unit is a chip Shredder installs into Krang's android in the 1987-1996 series episode Shredder & Splintered. Krang then uses it to enlarge the android, as well as himself, when fighting the turtles at the streets of New York City.
To defeat it, the turtles fly their blimp towards the android's upper parts. Donatello and Leonardo then climb inside the robot, smashing the chip in time before jumping out in time, preventing them from being smashed by the shrinking robot. This causes even Krang to shrink back into ordinary size.