# Beginner Electronics - Beginner Electronics – 12 – Schematic Basics

## Beginner Electronics

29 Lessons

### Beginner Electronics – 12 – Schematic Basics

what's going on everyone my name is Gautam and welcome back to electronics episode 12 in this episode we are going to be talking about the basics of

schematics and why schematics are so important now I know that this series has been pretty boring so far but we have to get through all this boring and necessary stuff before we go on to

making some really awesome circuits and part of making some awesome circuits is knowing how to create and read schematics now what in the world is a schematic well a schematic is basically

a representation or a diagram of a circuit that you want to build for instance if you were building a house you would have a blueprint of how to make that house well a schematic is

basically a blueprint of a circuit that we want to make in schematics are made up of many different symbols that we're going to learn throughout this entire series but we have to know the basic

symbols and how schematics are actually put together first and that's what we're going to talk about today so here you can see a very basic schematic this is actually the schematic of the circuit

that we built just a couple of videos ago where we made an LED light up now it looks really confusing right now but you're going to get the hang of this in no time I promise

so let's try and figure out what this does we know that this is going to light up an LED because I just told you that's what it does so what could all these symbols represent well let's start with

the simplest thing these white lines right here they probably would represent wires these white lines that are straight and going up and down are connecting components together and

that's exactly what they are they're just wires or a way of connecting two components together so that's simple enough now we know that our circuit had a battery it had a power supply so where

is that on our circuit well this symbol right here is a pretty Universal schematic symbol for a DC power source a direct current power source like a battery and you'll notice

that it has a long line here and a short line here and those represent the different terminals of a battery so say for instance this long one here generally means the positive terminal

while the shorter one means the negative terminal usually so it tells us how we can create our circuit and what needs to be connected to what terminal of the battery so if you were ever working with

an alternating current circuit that takes an alternating current instead of a battery remember we talked about this in one of the first videos of the series that schematic symbol would look a

little bit like this it would be a circle with a wave inside of it that would represent alternating current power source but anyways let's get back on to this

schematic right here so if we follow from the positive terminal of our battery down this wire right here we encounter this component right here now this squiggly line represents a resistor

and usually on schematics these resistors will either be labeled with a value or some type of name that way you can know the proper value of the resistor for instance this might be a

300 ohm resistor so that's a very important symbol to remember of course it's just a bunch of squiggly lines and that represents a resistor so if we have our battery and we have a resistor then

that means that this must be our LED component and it is it's basically a triangle with a line at the end here and then two arrows pointing up from it that is the schematic symbol for an LED a

light emitting diode and then we just have a wire connecting that all the way back to the negative terminal of our battery and that is it that's the schematic of the circuit that we built

just a few videos ago now let me go just a tiny bit more in-depth on some really important things that we need to know so I already talked about the positive and negative terminals of the battery and

the value of a resistor so let's head on to this led down here the part before the triangle here this is the anode if I can write that this is the anode of the LED or basically what you would usually

connect to a more positive power source well the part after the line of the LED is the cathode or the shorter leg of the LED so that's something that's very useful to know that way you're not

telling someone who's building this circuit to hook up the LED backwards now let's talk about one final very very important part of schematics how wires are shown on schematics it looks simple

enough here we just have wires connecting components together but schematics can get really really big and they can have many wires being shown so for instance let's say we have a wire

like that and then we have another wire in our schematic that's shown going over it like that there is no connection here there is absolutely no connection between these two wires they are two

completely separate wires they're not connected in any way it's just to save space on the schematic they have to overlap them like that the same goes for if you see this on a schematic there is

no connection whatsoever between these wires and I kind of like this version better because it shows like the wire is going over this wire and there's no connection

at all however what if you need to connect two wires together well that's going to look something like this with a giant dot in the intersection these two wires right here are connected together

they are a joined that way they are basically part of one another they're connected so that's just something really important to note so we know the very basic schematic symbols of what

we've already learned this far we know our DC power source our resistor here and then in LED and throughout this entire series as we learn about more and more electronics components I'll be

teaching you the different schematic symbols that are used for them but anyways that's the basic of schematics let's try and get into a little bit more exciting stuff throughout this series

thanks for watching everyone and I'll see you guys in the next video

We learn how to create/read schematics!

See my website: https://codenmore.github.io/