3000mAh SIMPLE POWER BANK

Hai…..friends. This is my second project…Have you ever used a readymade power bank? Hope yes! It’s very useful to new generation, especially during long trips. Its very easy to make it. There is nothing special in a power bank. It just uses batteries and voltage regulator IC’s. Actually the real production cost of a power bank is too cheap.

Here I have made a 3Ah power bank (just for 200 rs).

HERE ARE THE COMPONENTS USED IN MY POWR BANK

1.Battery---- 4.5v,,1.5Ah-------(x2)

2.voltage regulator IC---—LM7805------(X2)

3.usb port

4.switch

5.diaode

6.capacitor---100nf----(x2)

HERE IS THE CIRCUIT DIAGRAM FOR THE POWER BANK

LM7805 IC

This is a very cheap IC available form most of the local electronics shop.this IC is used to regulate the voltage to 5v. that iz this IC accepts an input ranging 5-9 v DC and gives out perfect 5v DC. Therefor in this case we get perfect 5v dc constantly. Here the two IC’s are connected in parallel to a about 2 Ampere current output, so that our device could be charged fastly. I have placed this IC on a heat sink which is used to absorb unwanted heat formed on the IC.it’s  preferable.

 

Images and detailz of LM7805

HERE TWO BATTERIES ARE CONNECTED IN SERIES TO GIVE A 9V OUTPUT TO THE VOLTAGE REGULATORS.THIS IC NEEDS a voltage above 5v to give regulated 5v output. If 5v or less than 5v is given as input the output will be varied.(it would be less than 5v).

Here diode is placed to prevent the backward flow of charge from our device to the power bank.

The capacitors clears any variations or  ac signals from IC.

The power bank works when the switch is on. This power bank can be charged from a DC adaptor of voltage ranging from 9 to 12 v.(((1 to 2 ampere input is preferred.))) ##The power bank must be switched off while charging.##

Finally the IC is connected to a USB port.IT must be connected correctly according the polarity.

Here is the photos of usb port(polarity is marked on photo)

Photos of power bank

If u r using an i-phone please connect a 200Ω resistor between the free legs of usb port(between the middle legs of USB port).So that your phone feels that it iz connected to its real charger and therefor get charged in normal speed……

Now u can make your own power bank!!!!!!!!ALL THE BEST!!!!

Please comment ur doubts and suggestions.

Thank you for visiting my site.

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