Circuitry (noun)

1. The layout and components of an electrical circuit.
2. The technology and design of electronic circuits.

Origin:

From the middle english circuit, from old french circuit, from latin circuitus ("circuit, going around"), from circum ("around") + ire ("to go"). the term circuitry was first used in the 19th century to refer to the components and layout of an electrical circuit.

Examples:

1. He was designing the circuitry for a new computer.
2. The circuitry of the device was complex and difficult to repair.
3. The circuit board held all the necessary circuitry for the device to function.
4. The circuitry was designed to be highly efficient.
5. He had a good understanding of the circuitry and how it works.