If you don't like reading watch my video on Youtube!
I have made it simpler there.
Also Huge Thanks to www.JLCPCB.com for Sponsoring this project, You can order 2 layer PCB (10cm*10cm) only for $2 from their website. Built time for 2 layers PCB is only 24Hr with any color solder mask. Check them out and once again Thanks www.JLCPCB.com for Sponsoring this project.
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.