Introduction: Electronics Basics : Diode

If you don't like reading watch my video on Youtube!

I have made it simpler there.

A diode is a electronic component. Most diodes are made with semiconductor materials such as silicon, germanium, or selenium.

Step 1: Let's First See Working in DC

When diode's anode is connected to +ve and cathode to -ve it is conductive with small voltage drop.

Please note the above sentence is not perfectly true! i will tell you at the end.

Okay what if anode is connected to -ve and cathode is connected to +ve

Well the answer is it's resistance become ideally infinite

Step 2: So How Can We Use It ?

You can use it as reverse polarity protection.

like I did with my arduino nano

Step 3: Now Let Us Talk About AC

For this I am using a step down transformer to be safe.

We know diode is conductive only when Anode is connected to +ve and cathode to -ve

so in AC the diode will allow only +ve half cycle to pass(in my case, if you hook it reverse it will allow -ve half cycle) which is DC

So we can use this DC as power supply. But......

Step 4: But....

It is a bumpy DC most of our components wont like it we can solve this problem by adding a capacitor at the output.

But as soon as we draw some current it become bumpy again because our capacitor charges only during +ve half cycle.

we can solve this problem by using Bridge Rectifier.

Step 5: How Bridge Rectifier Works ?

During +ve cycle current flows through diode D1 and D3 and during -ve cycle current flows through D2 and D4

in this way we can manipulate -ve half cycle to charge our capacitor

Remember I said earlier that diode is only conductive when anode is connected to +ve and cathode to –ve actually the definition is when anode is connected to higher potential and cathode to lower potential it is conductive

Hope you like this Instructables.

Comments

author
blic19933 (author)2016-07-12

Great job! I can see a whole series of basic electronics being useful. Keep up the good work.

author
Nematic! (author)blic199332016-07-15

Sure :)

author
nonderbe (author)2016-07-14

I never studied electronics, but I'm drawn to it. However, I find it hard to find tutorials like this that explain the basics in a really comprehensible and accessible way. Thanks a lot for your contribution! :)

author
Nematic! (author)nonderbe2016-07-15

Thanks your comment means a lot :) I will keep posting !

author
GuillermoR22 (author)2016-07-15

hi, where did you find that osciloscope?

author
Nematic! (author)GuillermoR222016-07-15

I ordered for Aliexpress for $18 but you can find them on ebay for $25

author
SiG3 (author)2016-07-12

Easy to follow, thanks!

author
DylanD581 (author)2016-07-11

Nice Introduction To Diodes!

author
rmercado4 (author)2016-07-11

Awesome!

About This Instructable

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Bio: Hi, I'm Nemeen !, Electronic and robotics enthusiastic. This is my channel 'Nematic !' I will be uploading on and about awesome Electronics Tutorials, Projects and ... More »
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