Electronics Basics : Diode




Introduction: Electronics Basics : Diode

About: Hi, I'm Nemeen, Electronics Enthusiast! I have seen a huge decline in electronics hobbyist in past few years. I started this channel in order to inspire you to create. Hopefully, you will find something tha...

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.



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    9 Discussions

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

    1 reply

    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! :)

    1 reply

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

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


    2 years ago

    Easy to follow, thanks!

    Nice Introduction To Diodes!