Definition
Electronic circuits that operate using only two discrete voltage states, typically representing the binary values 0 (off/low) and 1 (on/high). Information is processed, stored, and transmitted as patterns of these two states rather than as a continuously varying signal.
Plain English
Circuits that work in clear on-or-off steps instead of a smoothly changing signal. Everything is handled as combinations of 0s and 1s.
Context Anchor
Seen in aircraft electronics, avionics, engine monitors, flight displays, and control systems that use computers or electronic logic.
Derivation
Digital comes from the Latin digitus, meaning 'finger' — once used for counting in whole, separate units. That captures the idea well: digital circuits count and switch in distinct steps, never in-between values.
Why Pilots Care
Modern aircraft depend on these circuits for accurate processing of navigation, engine, and flight data, improving reliability over older analog systems.
Analogy
A light switch is a simple way to picture the idea: it is either on or off. A digital circuit uses that kind of clear-state thinking, but at very high speed and with many tiny electronic switches.
Intuition Check
Digital does not just mean “has a screen.” In this context, it means the circuit handles information as separate electrical states, not as one smooth changing signal.
Example Sentence 1
The new GPS unit uses digital circuits to process satellite signals into position and altitude data.
Example Sentence 2
Maintenance crews check digital circuits in the avionics bay when a navigation display shows erratic readings.