Friday, September 24, 2010

Schematic Diagrams

Being able to read and understand schematic diagrams is an essential part of working as an electronics technician or when working with any sort of DIY project that involves wiring.

Schematic diagrams are pictorial representations of how the circuit is wired and how connections are made. The symbols do not always look like their real life counterparts but it makes it much easier to draw a schematic symbol than something that resembles the actual component.

Here are some common schematic symbols as well as what the component looks like in real life


The longer line up top is the positive connection and the smaller line on bottom is the negative connection. I'm sure we all know what a battery looks like in real life and that 9 volt up there is just one example

Resistors don't have a negative or positive lead and can be connected either way, resistors come in varying sizes of resistance that are indicated by the color code of the resistor, I will go into the resistor color codes in a future post.

Incandescent light:

Lets hook these up and see how they would look in a schematic symbol

Here we have the battery hooked in series with the resistor and the lightbulb. When I say in series I mean that if any of those connections was to be open the entire circuit would cease to operate. I will cover series and parallel circuits in a future posting as well.

These are just a few of the probably hundreds or even thousands of different schematic symbols there are out there and I will cover more complex ones in future postings.


  1. good sir are you an electrical engineer?

    very interesting have a good day

  2. You seem quite professional. Will keep up with this blog.

  3. Nothing like reading up on something like this.

  4. always wonder what those were, turned out to be resistors

  5. I can't believe I still remember this shit.

  6. At first it seemed confusing, but now I think I'm getting it.

  7. showin daily support =) Come do the same?

  8. I never knew about these very interesting stuff, pls post more of a how to so I can learn to read them.

  9. I'm going to have to start coming here more often. I've been meaning to teach myself some simple electronics, to set up LEDs and stuff