Don't have a mobile phone charger and the battery is about to drain..?

Make an Emergency Charger yourself at home to charge your device from nothing but a 9v Battery.

This video shows a simple way to learn how to make a mobile phone charger at home very easily.

Note: A normal zinc carbon battery will not give much backup and will get drained out fast. So, its recommended to use rechargeable batteries.

Step 1: Components Required


1. A General Purpose PCB Board - http://amzn.to/2mww8hk

2. 7805 Voltage Regulator - http://amzn.to/2n82IXN

3. 100 uF capacitor - http://amzn.to/2nqxJ6w

4. 10uF capacitor - http://amzn.to/2lYkuNG

5. Female USB Port - http://amzn.to/2nluxfX

6. 9v Battery - http://amzn.to/2mq7Rqv

7. A Battery connector clip - http://amzn.to/2n83e8j


1. A General Purpose PCB Board - http://amzn.to/2lkylJH

2. LM 7805 Voltage Regulator - http://amzn.to/2lYjysF

3. 100 uF capacitor - http://amzn.to/2nlsokr

4. 10uF capacitor - http://amzn.to/2lYocGK

5. Female USB Port - http://amzn.to/2mq9jtg

6. 9v Battery - http://amzn.to/2nlmK1I

7. A Battery connector clip - http://amzn.to/2mH5Rey

Step 2: Procedure

1. Refer to the circuit diagram of the project.

2. Insert the clip on PCB board and paste it using hot glue.

3. Solder the connector to the base.

4. Solder a 100uF capacitor parallel to the connector clip.

5. Refer to the pin configuration of 7805. Solder the IC on the base such that, input pin is near the capacitor and connect input pin to +ve terminal of capacitor.

6. Take a 10uF capacitor and solder the +ve terminal to the output of 7805 I.C.

7. Refer to the pin configuration of female USB port. We have 4 pins

  • pin 1 - Vcc
  • Pin 2 - Data (-)
  • Pin 3 - Data (+)
  • Pin 4 - Ground

8. Solder the port to the base and connect pin 1 to the +ve terminal of 10uF capacitor.

9. Make all the ground connections.

Step 3: Mobile Charger Is Ready

Our Mobile Charger is now ready.

Note: Use it only in case of emergency, for regular charge, use normal wall charger.

Attach a 9v Battery and connect the mobile phone using a USB cable

we see that, the mobile charges well.

Don't do with regulators like 7805 try other regulators, as in this 7805 burns more energy in bringing 9v to 5v in form of heat and battery is also expensive. Joule's thief is also nice concept you should think about it.<br><br>but neat and clean work nice keep it up :)
<p>what is meant by other regulators....?????</p><p>can u plz say about that</p>
<p>Thank you for appreciating my work..:) Yes, 7805 do get heated up and loses more energy but it is very commonly available and moreover this is only an emergency charger..:-p</p><p>Thanks for suggesting about Joule's thief, will look into it soon. Can you suggest me some nice joule's thief projects or some verified links..? </p>
Is that i can use other voltage regulator
<p>The Joule thief circuit isn't overly efficient, what it gets you is it lets you discharge batteries far further. For example, your circuit will stop working after a 9V battery's voltage sags much past 7V, which tends to leave a lot of power in the battery. The Joule thief will drain the battery down to ~1V, using up all power you could reasonably extract from any given battery.</p><p>However, the big downside to Joule thief circuits, is they will destroy rechargable batteries, because the battery will be discharged far past it's minimum voltage; not many rechargable batteries can handle more than a couple deep discharge cycles, and Lithium batteries in particular can detonate when recharged after being over-depleted.</p><p>9V batteries have terrible properties for this circuit, even with a rechargable model, you'll probably only extract maybe 100mAh from the battery before the voltage drops below what the 7805 can regulate. That's barely enough to turn on the &quot;charging&quot; indicator light for more than a few minutes, and wouldn't even charge more than 2% of my cell phone's battery; nowhere near enough to place a call, and barely enough to send more than a handful of SMS messages.</p><p>A better choice would be 5x or 6x AA or AAA batteries; not only are <br>those sizes more common and cheaper, but they store FAR more energy, and <br>if you use 5x batteries, then the 7805 will waste less power as heat.</p>
Yes u are right it can be done that way
<p>Yes, you are right. Thanks..:)</p>
<p>i need some help, my tablet charger looks fine, but when i switch it on, and check my tablet, it doesn't have the lightning bolt, and i cant charge it. =( PLZ HELP!! </p><p>hope u can do this request. &gt;.&lt;</p>
<p>find out similar articles here</p>
<p>find out similar articles here</p>
Rulof Maker made a better one on YouTube
What voltages are the capacitors rated at? Pls reply
<p>The voltage of capacitors does not matter if it is rated above the input supply voltage. However, i have used 100uf, 25v capacitor and a 10uf, 16v capacitor.</p>
<div>I tried this two years ago. Do not use normal batteries, battery discharge ...<br><br>I don't recommend this.<br></div>
<p>I have written in above instructables that it is not recommended to use normal batteries. You must use rechargeable and high current batteries (Li-ion preferably).</p><p>Also, you can input voltage from any DC charger lying around and get a regulated 5v supply for your mobile device. </p>
<p>Great idea!!... Thanks!!....</p>
<p>Thank You..:)</p>
<p>For Apple devices just join together Pin2 - Pin3 then all 5.1V / 2A supply work fin with.</p>
<p>So in reading the comments, this doesn't work for the iPhone. Sucks for me... Does this only work with android phones or tablets? Can you do a tutorial on an emergency charger(s) that do work for the iPhone?</p>
Just bring a iphone female usb clip capable with your iPhone
<p>Will this work with Apple devices? I seem to remember that Apple devices require voltage on the 2 data pins (2.2V?) to accept the charger and actually charge the device.</p>
<p>No this charger is not designed to work with apple devices. They need additional voltage on data pins (I am not aware of the voltage value).</p>
This charger has three big problems:<br>1.)9V battery can put out about 200mA of current<br>2.)9V battery has small capacity and they are expensive<br>3.)with linear regulator you have just 55% of efficency (eg LM2596 would be much better)<br><br>:)
<p>#voblak yes that i true, actually this charger was only made as a project, not as product. Although, it works well in case of emergency :-p</p>
I charged my phone on just a 9 volt battery and no components. Is that bad for the phone ?
Nah, if it takes it in. Your phone has built in regulators to do the job, but usually phones dont take in power likes that.

About This Instructable




Bio: Hello Guys, I am techgenie, an Electronics hobbyists, tech tinker and developer. I dedicate my free time in designing and making various creative and innovative ... More »
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