Reading Schematics and PCB Boards 101: Electronic Circuit Reference Abbreviations and Symbols

Introduction: Reading Schematics and PCB Boards 101: Electronic Circuit Reference Abbreviations and Symbols

In this instructable I will talk about how to read a schematic and how to identify electrical components on a PCB (Printed Circuit Board).

Electrical components are identified two main ways.

  1. Abbreviations
  2. Symbols.

On a schematic you will also see a electrical components symbol next to it will have a identification number next to its abbreviation (ie. You will see the symbol for a resistor. The abbreviation for a resistor "R" followed by a number to identify it on a PCB "R102". Next to the symbol you will also see its value "2.2K". This tells you resistor 102 has a value of 2.2K ohm's. Ohm's because resistance is measured in Ohm's.

On a PCB is a completely different story. Sometimes you will not have any abbreviations, and Most of the time you will not see any symbols. Most of the time you will see a components next to a letter with a number next to it(ie. "R102") the "102" wont mean much unless you have the schematic But know you know its a resistor and you can look up how to read a resistor value. (the colored lines on the resistor will tell you its value.)

Step 1: Abbreviations.

There is a good list Here.

Step 2: Symbols.

There is a good list Here and Here.

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    7 Comments

    0
    dstibrdgs
    dstibrdgs

    Question 4 weeks ago on Step 1

    my arduino uno (knockoff model) has a power terminal labeld "VIIN" what does it stand for?

    IMG_20220601_153052.jpg
    0
    robmawe91
    robmawe91

    Answer 4 weeks ago

    Should be VIN (Voltage in). Just google Arduino Uno Vin for referance.

    0
    kersteincontacts
    kersteincontacts

    Question 3 months ago on Introduction

    Can you tell me what all these are ? It's a dual dc204 car stereo and I have an idea I want to try but I'm 2nd guessing myself so maybe you can help settle my debate with

    0
    kersteincontacts
    kersteincontacts

    Answer 3 months ago

    Can't seem to get the images to up load which makes it kinda hard to get the answer I'm looking for hmm

    0
    SherylinRM
    SherylinRM

    5 years ago

    Nice.

    Thanks for this :)

    0
    robmawe91
    robmawe91

    Reply 5 years ago

    Your welcome.