Electronics are an advanced crafting resource in Ark and are created in the Fabricator. They are not used in a large number of Engrams, but where they are you tend to need a handful. Luckily, producing a decent number doesn't have to be painful.
Electronics can only be created in the Fabricator, and they require 3 Silica Pearls and 1 Metal Ingot each. While this may seem like a lot, the harvesting of both Metal Ore and Silica Pearls does not have to be a road block for you.
For more information on gathering and processing the required resources, please see:
Metal Ore & Harvesting
Silica Pearls & Harvesting