## Logic circuits

A **Logic circuit** uses two logic levels to transfer the information. A high logic level or “1” and a low logic level or “0”. The Logic circuits are made of digital components such as the **AND gate, the OR gate, the NOT gate and combinations of them.**

These combinations of gates give way to other types of digital components, such as different logic gates, among others.

- NAND gate
- NOR gate
- Exclusive OR gate
- Mutiplexors
- Demultiplexors
**Decoders**- Encoders
- Memories
- Flip-flops
- Microprocessors
- Microcontrollers
- Etc.

Modern digital electronics is used to perform many functions. While digital electronic circuits might seem very complex, actually they are built with a very large number of very simple circuits.

In Digital electronics, the information is transmitted between circuits in a binary form (zeros and ones). The binary information is represented in the form of:

- “0” and “1”,
- “Open” or “Closed” (switch)
- “On” and “Off”
- “False” or “True”, etc.

A** logic circuit** can be represented in many ways. In the following circuits, the lamp can be turned on or off, depending on the switch position.

A** truth table** is a tabular listing of all possible states of the switches (inputs) that affect the circuit and their corresponding output values.

### More Digital Tutorials

- What is the difference between Analog & Digital?
- What is a logic circuit?
- Digital logic levels (high, low, 1, 0)
- The truth table
- Boolean algebra
- Karnaugh Map (K-map)
- Binary number system
- Hexadecimal numbering system
- BCD code – binary coded decimal
- Gray code – Gray code table
- Aiken code – Excess 3 code
- AND gate
- NAND gate
- OR gate
- NOR gate
- NOT gate
- XOR gate
- How to build a NAND gate with transistors & diodes?
- OR & AND logic gates made with diodes
- The combinational circuit
- The sequential circuit
- JK Flip-Flop
- What is a binary decoder?