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You are here: Home / Schematic Diagram / Reading Schematics Is Easy

Reading Schematics Is Easy

October 1, 2012 By Øyvind Nydal Dahl 6 Comments

Reading schematics is just a matter of recognizing the symbols and see how they connect.

A symbol usually represents a part. Except for the ground and VCC symbols which just means connection to supply power.

The lines between the symbols represents wires that connect the components. That’s all.

Check out the electronic symbols.

blink-led-astable-multivibrator-schematic

Component Names and Values

Often, the symbols have both a name and a value attached to it, such as R1, 100k. The name is there to name the components and the value shows what kind of value this part should have.

Electrical Connections Only

A schematic you find on the Internet sometimes includes only electronic components and no connectors. That is, instead of putting a symbol for a battery connector, you just see a line with a 9+ in the end of it. Or instead of a USB connector, you will see four lines with names such as VBUS, D+, D-, GND.

This is because schematics explain how components are electrically connected to make a specific function. Not to explain how to physically create the circuit. That is the job of the board layout.

Missing Pins

Sometimes, some of the pins of a component are missing from the schematic.

In the example below you can see an operational amplifier (op-amp). The symbol shows only three pins. But the op-amp has two more pins: VSUP+ and VSUP-. Why aren’t they showing up?

The reason for this is to make the drawing simpler.

Wire Names

Sometimes you will see a wire stopping at a text such as “input” or “Vref”. That means the designer has named this wire. This means that all other wires with the same name are actually connected. And it also says something about its purpose.

For example, if you are reading schematics for an amplifier and you see a wire named “input”, what do you think its purpose is? It is probably where you connect your input to the amplifier ;)

Summary Of Reading Schematics

To read a schematic diagram, you need to know

  • The electronic symbols
  • That lines between components represent wires

Return from Reading Schematics to Electronic Schematics

More Schematic Diagram Tutorials

  • Introduction to Schematics
  • Schematic Symbols
  • How To Read And Understand Any Schematic
  • Reading Schematics Is Easy
  • Creating Schematic Diagrams
  • How To Design Your Own Schematics From Scratch
  • What is Ground in Electronic Circuits?
  • Free Electronic Circuits And Schematics Online
  • Free Circuit Drawing Software: SchemeIt

Filed Under: Schematic Diagram

Reader Interactions

Comments


  1. michael fernandez says

    September 4, 2014

    I wanted to see and touch ele-
    tronics. This wish was for our
    ‘students. Yes, they do no see
    and touch and you came on
    the way. I AM in a small village
    in India. an our technical is
    working in two year’s gover
    ment courses. One request: do
    nat ask me money bu I shall
    give you. my friend ship.

    Reply

    • Shankar Nair says

      October 27, 2014

      I can help you with your electronic classes and guide you how to train your students free of cost. I would like to help students from any village . contact me on [email protected] or [email protected] mail.com

      Reply

      • Ahiafor wisdom says

        December 2, 2020

        I’ll be happy if you can help me out

        Reply

    • Siddharth Singh says

      October 19, 2015

      Hey michael, I can also help your students. Message me regarding this issue on my email id – [email protected]

      Thanks for letting me help in future.
      Siddharth singh
      Indian

      Reply

  2. Tony says

    June 1, 2016

    Ovine , I am enjoying your building electronics circuits at the age of 55 years old . Can you please explain when working of a schematic drawing how to run the wiring on a breadboard . The drawing is clear but how is wired . Thank you

    Reply

    • admin says

      June 2, 2016

      Hey Tony,

      That’s great to hear.

      Maybe this breadboard article will make it more clear: https://www.build-electronic-circuits.com/breadboard

      Best,
      Oyvind

      Reply

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  • Introduction to Schematics
  • Schematic Symbols
  • How To Read And Understand Any Schematic
  • Reading Schematics Is Easy
  • Creating Schematic Diagrams
  • How To Design Your Own Schematics From Scratch
  • What is Ground in Electronic Circuits?
  • Free Electronic Circuits And Schematics Online
  • Free Circuit Drawing Software: SchemeIt

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