Electronics Basics : Diode

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

I have made it simpler there.

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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

You can use it as reverse polarity protection.

like I did with my arduino nano

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......

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.

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

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