how do i read this stuff?

i have played around with motors hooked up to batteries and thats about it. i know a few things about electronics but i am looking to do some projects that involve circuits. i dont know how to read it when it is in a drawing. it looks to confusing to attempt. all those lines crossing and all those symbols. i have a book called electronics for dummys but it doesnt give to much detail. does anyone know how to read this stuff and can help me? is there any sights on the internet that would help me. remember i am pretty newbish. so it needs to be in newbish form. lol. the drawing below is from a powersupply that i would like to build. thanks ~Josh

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gmoon10 years ago
Excellent explanation from 'guyfrom7up.'

I'd like to add a little more 'filler:'

The left (input) side is DC voltage, 3V to 40V. A DC wall-wart will work fine. If you're using a 'bare' transformer as the source, you'll need a bridge and a filter cap, too (convert AC to DC.)

You'll need to 'feed' it more volts than you plan to use--if you want a range from 3V to 12V, 15V for the input should be fine.

LM317 wikipedia link, this has datasheets, too (might be a bit confusing, but you need to start sometime.)

One more thing: the bottom (GND line) is often not physically connected in schematics. Rather, it's represented by a GND symbol....

Another one more thing: When multiple components are connected together to the same line (VO on the schematic), it generally doesn't matter where they are connected. I.E., D1 could be connected to the right of D2--it's all the same, electrically...
Goodhart gmoon10 years ago
A good example of what Gmoon is speaking of concerning the ground line is on the following power supply schematic:
40A 12-24VDC Tripp Power Supply.jpg
gmoon Goodhart10 years ago
Goodhart's schematic also illustrates a transformer as the source (input.) However, it's a multi-tap transformer, and you won't require that type. If that doesn't make any sense, don't worry. Try to find a DC source first. If you must use a transformer, ask here, and someone will explain how to hook one up to your power regulator circuit...
Goodhart gmoon10 years ago
No, sorry for the confusion, I was just illustrating the Ground line being shown with the ground symbol rather then a straight line.
GorillazMiko10 years ago
R2 is Resistor 1 and D2 is Diode 2. So R2-D2 from Star Wars is "Resistor 1-Diode 1". Just kidding. If you google up "schematic symbols" then you'll get a bunch of sites, and they'll show symbols used in schematics.. and you can figure it out, it's pretty easy.
Surely R2 is Resistor 2?
yeah, really, lol i'm not being sarcastic
guyfrom7up10 years ago
no problem, I'm glad to help, makes you feel all good and special inside, lol.
guyfrom7up10 years ago
in some parts of the schematic 3 parts are connected together, in this schematic, nothing's overlapping, so all the greens are touching as they appear. where ever there's a green dot, those too wires are connected. For example: Pin2 of the LM317T is connected to R1, D1, D2, C2, and the output. usually in a diagram a dot means that the wires (technically called nets when using Printed Circuit Boards) are connected. no dot means that they are not. In other schematics there might be a slight curve, kind of like a jump across intersecting wires that arn't connected, and everything else is connected, just as a dot was before, just no dot. Pm me if you have anymore questions that don't really fit anywhere.
Goodhart10 years ago
A few places to look at: Reading schematics guide

for help, and also another source...

Like reading a map, it is only a matter of learning the symbols:
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