Last Sync: 2022-12-05 07:30:05
This commit is contained in:
tactonbishop
parent
4c62dac371
commit
28b4e336ec
3 changed files with 1 additions and 88 deletions
|
|
@ -8,7 +8,7 @@ tags: [electrical-circuits]
|
|||
|
||||
Ultimately every process in a computer is the product of a digital [circuit](/Electronics/Circuits.md) that is working on binary values. In contrast to electrical circuits, digital circuits are not represented in an [analogue](/Hardware/Analogue_and_digital.md) fashion.
|
||||
|
||||
Analogue circuits work on the basis of real continuous phenomena in the world: charges and currents. As a result, the key properties of a circuit - voltage, current and resistance - can vary over a wide range of values. This is the reason that we require) components like batteries and resistors: to control the natural flow of current and ensure that it only runs within desired parameters.
|
||||
Analogue circuits work on the basis of real continuous phenomena in the world: charges and currents. As a result, the key properties of a circuit - voltage, current and resistance - can vary over a wide range of values. This is the reason that we require components like batteries and resistors: to control the natural flow of current and ensure that it only runs within desired parameters.
|
||||
|
||||
In a standard electrical circuit, voltage, current and resistance can vary over a wide range of values however in the binary context we want to deal with discrete values (zeros and ones) which can be fed into the various [logic gates](/Hardware/Logic_Gates/Logic_gates.md).
|
||||
|
||||
|
|
|
|||
|
|
@ -1,79 +0,0 @@
|
|||
---
|
||||
categories:
|
||||
- Computer Architecture
|
||||
- Electronics
|
||||
- Hardware
|
||||
tags: [logic-gates, binary]
|
||||
---
|
||||
|
||||
# Logic circuits
|
||||
|
||||
> Now that we are familiar with the individual [logic gates](Logic_gates.md) and their truth conditions we are in a position to create **logic circuits**. These are combinations of logic gates controlled by inputs that can provide a range of useful outputs. The output of a logic gate is a function of the truth-values of the individual gates and their connections to each other.
|
||||
|
||||
## Basic example
|
||||
|
||||
In the below circuit we have the following gates connected to two inputs with one output, moving through the following stages:
|
||||
|
||||
1. `AND`, `NOT`, `NOT`
|
||||
1. `AND`, `NOR`
|
||||
|
||||
This is equivalent to the following truth table:
|
||||
|
||||
````
|
||||
A B Output
|
||||
_ _ _____
|
||||
|
||||
0 0 0 (1)
|
||||
1 0 1 (2)
|
||||
0 1 1 (3)
|
||||
1 1 0 (4)
|
||||
````
|
||||
|
||||
|
||||
|
||||
*Line 1 of the truth table*
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
*Line 2 and 3 of the truth table (equivalent to each other)*
|
||||
|
||||
|
||||
|
||||
|
||||
*Line 4 of the truth table*
|
||||
|
||||
## Applied example
|
||||
|
||||
With this circuit we have a more interesting applied example.
|
||||
|
||||
It corresponds to an automatic sliding door and has the following states
|
||||
|
||||
* a proximity sensor that opens the doors when someone approached from outside
|
||||
* a proximity sensor that opens the doors when someone approaches from the inside
|
||||
* a manual override that locks both approaches (inside and out) meaning no one can enter of leave
|
||||
|
||||
Here's a visual representation:
|
||||
|
||||
|
||||
|
||||
The following truth table represents this behaviour, with A and B as the door states, C as the override and X as the door action (0 = open, 1 = closed)
|
||||
|
||||
````
|
||||
A B C X
|
||||
_ _ _ _
|
||||
|
||||
0 0 0 0
|
||||
1 0 0 0
|
||||
0 1 0 0
|
||||
1 1 0 0
|
||||
0 0 1 0
|
||||
1 0 1 1
|
||||
0 1 1 1
|
||||
1 1 1 1
|
||||
````
|
||||
|
||||
|
||||
|
||||
*Automatic door sensor with manual override*
|
||||
|
|
@ -1,8 +0,0 @@
|
|||
---
|
||||
categories:
|
||||
- TestRename
|
||||
tags:
|
||||
- test-rename
|
||||
---
|
||||
|
||||
Here is some fuckin' text.
|
||||
Loading…
Add table
Reference in a new issue