Home > CRUMB Circuit Simulator > CRUMB Circuit Simulator Simple LED circuit for beginner

CRUMB Circuit Simulator Simple LED circuit for beginner

Simple circuit for beginner that don’t know how to build the circuit on the breadboard

Simple LED circuit for beginner

This is a simple walk-through guide for the beginner to learn how to use the breadboard to build a circuit based on your design. This guide will include:

  • Understand the breadboard
  • Preparation
  • Wire and components
  • Power on

The circuit diagram for this guide is:
Simple LED circuit for beginner

Understand the breadboard

Firstly, before we start to build the circuit, we need to understand what is a breadboard?
Breadboard is very commonly used in the lab for building the temporary circuit. By using a breadboard, soldering is not needed and is easier for the user to change the connections very quickly.

The first thing that we need to do is to attach the power rail to the top and bottom of the breadboard.

Simple LED circuit for beginner

After attaching the power rail the breadboard should look like this.

Simple LED circuit for beginner

In the diagram above, you can see some green lines that represent the common connection (row and column).

For example, the wire/connections inserted in A1 is electrically connected to B1, C1, D1, E1. This applies to the power rails as well.

Simple LED circuit for beginner


There are a few preparation steps we will usually take before start making connections. The very first thing to do is to connect the power rails.

Simple LED circuit for beginner

As you can see the (+) rail on top is connected to the bottom (+) rail. Same thing applies to the (-) rails. This is much easier for us to make connections and easier for the wire managements when circuit is getting more and more complicated.

Secondly, If we have a lot of components, we need to plan the placement of the components. This is very simple but crucial step to ensure minimum wire crossing on the breadboard. But in this guide only a few wires are needed so it is not very significant.

Wire and components placement

Firstly, we look back the circuit diagram.

Simple LED circuit for beginner
  • The important thing we need to beware is the polarity of the components.
  • As you can see in this circuit diagram, the (+) polarity of the power source is connected to one of the terminals of the 330ohm resistor.
  • Then another terminal of the resistor is connected to the anode (which is also refer to the positive terminal) of the LED. The cathode (negative terminal) of the LED is connected to the (-) terminal of the power source.


So we can now place the resistor first onto the breadboard. In this case, I place the resistor in hole E12 and F12. The resistance of the resistor is set as 330 ohm.

Simple LED circuit for beginner

Light Emitting Diode (LED)

Next, I place the LED in hole F18 for anode (+) and E18 for cathode (-).

IMPORTANT: Please look carefully for the anode (+) and cathode (-) pins of the LED !

Simple LED circuit for beginner


Lastly, we need to connect each of the components (resistor and LED) to form a closed circuit.
You can compare the diagram below with the circuit diagram to understand better.

Simple LED circuit for beginner

Power On

Power Supply

Lastly, we need power supply to electrically turn on the the circuit. Based on the diagram below, you can see that the red terminal of the power supply is connected to the (+) power rail and black terminal is connected to the (-) power rail.

Simple LED circuit for beginner

Power On!!!

Lastly, we can switch to the Interact tool and turn on the power supply.

Simple LED circuit for beginner

Well done, you completed your very first mini project and hope you will enjoy this guide.



Thanks for reading this guide until the end. Please comment below if you have any doubt or questions. It might look strange to you when you first time using the breadboard, but i am sure that you will do better and better after using it for several times. Thank you.

Written by Qahnaarin

Leave a Comment