🔌 AND, OR, NOT — Fundamental Logic Gates

Logic gates are the building blocks of digital electronics.

They process binary inputs (0 or 1) to produce a single binary output based on a specific logical function.

The fundamental logic gates are AND, OR and NOT

1️⃣ AND Gate

An AND gate outputs 1 only if all its inputs are 1. Otherwise, it outputs 0.

📊 Truth Table

📐 Symbol

A ----| & |
   ---- OUT
B ----|   |

🔍 Notes

• Logical operation: Multiplication in Boolean algebra.
• Only true when all inputs are true.
• Extendable to more than 2 inputs.

2️⃣ OR Gate

An OR gate outputs 1 if at least one input is 1.

📊 Truth Table

📐 Symbol

A ----)≥1 )
   ---- OUT
B ----)   )

🔍 Notes

• Logical operation: Addition in Boolean algebra.
• True if any input is true.
• Used to combine conditions.

3️⃣ NOT Gate

🧾 Definition

A NOT gate outputs the opposite of its input (inverts it).

📊 Truth Table

📐 Symbol

A ----|>o---- OUT

🔍 Notes

• Logical operation: Negation in Boolean algebra.
• Often called an inverter.
• Only 1 input.

🧠 Key Takeaways

• AND, OR, NOT are the fundamental gates; all other logic gates and digital circuits can be built from them.
• Represented mathematically in Boolean algebra.
• Implemented physically using transistors in integrated circuits.