Step 3: HOLD UP: What about Polarity?

some components to a circuit board are polarized, meaning one side is positive and the other is negative. this means you have to attach it in a certain way. for most symbols polarity is included in the symbol. in the the photos below you will find a guide to distinguishing polarity for various symbols. to find out the polarity of the physical part a general rule of thumb is to look for which metal lead wire on the part is longer. this is the + side.
<p>useful information for the beginner </p>
<p>Omg so helpful! thanks!<br></p>
<p>its really very helpfull for me too</p>
<p>supercool. thanks for taking the time!</p>
<p>this is very helpful thank you</p>
<p>Great work. explains this clearly. I never used circuit schematics i just had my own symbols but when it came to building something from an already designed schematic i got stumped</p>
<p>hey that helpful thanks</p>
very smooth! go ahead
Thank you!!! It's such a good guide - not too much information, but a great starting point - thank you!
<p><strong>GREAT WORK LIKED IT VERY MUCH</strong></p>
Easy to read, great job.
<p>great post... ill be printing this to keep in my soldering/ components kit, as you said, its a least a good refrence.</p>
<p>An LED symbol has two diagonal arrows coming off the horizontal triangle.</p>
<p>Thank you. just cleared up a few things that have been ripping away at the back of my mind.</p>
<p>It seems to me that the symbol for the NOR gate is incorrect. It should be an OR gate with a bubble on the output. Just a small observation.</p>
<p>Six years and you are still being read. Do you know that?</p>
<p>Good job man</p>
great job<br>im new to using resistors,capacitors and other hard stuff
<p>Very simple and easy to follow, good job so far.</p>
<p>easy so far, hoping you continue..</p>
<p>Here is an interactive simulation you can use to practice reading basic circuit diagrams. It allows you to assemble and test simple circuits. </p><p><a href="http://stemsheets.com/engineering/electric-circuit-game#resource" rel="nofollow">Electric Circuit Game</a></p>
I still don't understand how microchips, like 555 timers and those other blac rectangles with like, 20 leads work. Nor do I get caps. For that matter, how the heck does electricity flow? Oh well, camera tasers are still awesome. -PKT
<p> Atoms are a nucleus with electrons around them, also known as electricity. Metals do something weird when they are together: they have a sea of electrons, thus giving them highly conductive properties. Gold and silver are known as super conductors, because their resistance is basically zero.</p><p>======= T H E I M P O R T A N T S T U F F =======</p><p> Electricity is negatively charged, and since same charges repel each other, electrons want to get away from other electrons as fast as possible. A battery works by having electrons all in one spot, trying to get away from each other, but they can't. Once a path is made or circuit is closed, then there is a way for the electrons to get away from each other. The less resistance, the faster they leave, which is why short circuiting is so bad.</p><p> I hope I helped.</p>
<p>incorrect. yes electrons flow, and yes electrons are negatively charged, but electricity is always treated as a flow of positive charge, opposite in fact to the direction of electron flow. this is known as conventional current</p>
micro chips are very complicated small circuits. they are built out of the same things as most circuits: resistors, capacitors, transistors, etc.... just shrunk way down. hence micro. so really a micro chip is just a very tiny circuit board pre-made for your use
Your the first one in 3 years to make microchips actually make sense. Thank you. -PKT
<p>whats the symbol for a transformer</p>
<p>Here it is</p>
<p>Symbol for transformer is:</p>
<p>Good work!</p><p>Help me a lot.</p><p>Ravi</p><p>R&amp;D Engineer</p><p>www.nrdcentre.com</p>
<p>hi! i am a grade school student and one of our project is to pickup invention in instructable site. i have chosen your laser trip wire as my project but i am having a difficulty in finding the circuit board. The store just gave me project board to use as circuit board but i don't have any idea on how to use it. can you help me,please?</p>
<p>Great instructable ! I read because I am creating a computer and I'll need help!</p>
<p>Small questions being answered TY.</p>
<p>very easy to follow so far</p>
<p>Great!!! Thank You</p>
I'm it trying to be a cynic, but I think that the diode was improperly labeled in the schematic. By all means, correct me if I'm wrong, but aren't LED's supposed to have two little lightning bolts along side of them?
<p>i thought the same thing, lightning bolts are unfamiliar to me, but i've seen 2 arrows pointing away from the triangle showing light is being emitted from it</p>
<p>Will someone please explain the correct way to wire a switch to this from the #14 12vdc switch input?</p><p>In step#9 it says &quot; customer supplied switch&quot; , just not the correct way to wire the switch, I contacted the mfg, but did not hear back from them</p><p><a href="http://www.brookingindustries.com/instructions/FL-8ORFiP.pdf" rel="nofollow">http://www.brookingindustries.com/instructions/FL-8ORFiP.pdf</a></p><p>Thanks in advance</p>
<p>very helpful sir.i am an electronics and communication student.thank u.</p>
<p>You may find these customizable flash cards useful for learning circuit symbols: <a href="http://stemsheets.com/engineering/electric-circuit-symbols-flashcards" rel="nofollow">Circuit Symbol Flashcard Maker</a></p>
<p>VERY helpful...One question though...If when reading a diagram if the wires are connected on the diagram BEFORE a switch post but go right into a switch post after the connection when you are wiring do you solder mid wire or at the switch post thing?</p>
<p>This is helpful, especially for those who want to learn more about circuitry, and for us engineers to further enhance our ability and familiarization on symbols and types, Great!</p>
<p>i like it</p>
<p>Thanks! Pure simple and Clear. </p>
<p>can some one tell me how to use a 8 pin mini transformer</p>
<p>whats the symbol fora transformer.</p>

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