I was getting ready for a long train ride from KY to DC and found out there aren’t any AC outlets for coach seats! A 15hr ride isn’t too bad when you have a smart-phone; then again, the stock battery on an HTC Incredible will last only about 3hrs of heavy usage. Not good. I wanted a way to be able to use it for, well, 15hrs. So, using some easy-to-find parts I made an extended battery that will charge the phone via USB. I also wanted the extended battery to be rechargeable. So, I need to be able to have access to the battery contacts; maybe later I will add something fancier, but for now the battery disconnects from the USB circuitry. Here’s my finished product, and how to make it.
I bought a battery from the local Home Depot for $20 (look in the outdoor lighting aisle). It is 6V and provides 6.5AH. You can get it cheaper at places like batterymart.com, but I was in a hurry and the shipping on seal-lead acid batteries is not cheap. The higher the amp-hours (6.5AH in this case), the longer you will be able to run your USB device.
Now for the voltage – USB uses 5V DC. I needed to drop the voltage from 6V to 5V, preferably without too much loss. There are three main options: voltage divider using resistors, non-switching regulator, and a switching regulator. In the case of the voltage divider, the resistors basically turn the extra voltage into heat, and they would need to be rated for higher power than the typical $0.01 resistors. Switching regulators, or DC-to-DC converters, are much higher efficiency, but are more costly. Also, I couldn’t find one that would work at Radio Shack, so I went with a non-switching regulator: the 7805.
The 7805 regulator will take voltages higher than 5V and hold them at 5V, also allowing up to 1A of current. While that’s much more than is needed, it gives a nice buffer. A regulator has three legs: 1) input, 2) ground, and 3) output, where the ground leg is shared between the input and output. The input comes from the positive side of the battery, the output goes to the 5V pin on a USB connector, and the negative side of the battery along with the GND pin on a USB connector both connect to the ground. Since the 7805 drops the difference in voltage by heat, adding a heatsink to the regulator might be needed, depending on how much power your device will draw.
To connect USB devices, I need an adapter that would allow me to plug in a standard USB cable, like the one in your computer. I happened to have an old PS2/USB adapter from an old mouse. It hasn’t been used, ever, so I cut it up (the green thing above). You could use something else, like a USB extension cable which already has wires to solder to. USB connectors have 4 pins: 1) 5V, 2) Data+, 3) Data-, and 4) GND. Use some wire to solder the connections (USB 5V -> 7805 Output), (USB GND and Battery negative -> 7805 Ground), and (Battery positive -> 7805 Input). Make sure to protect the solder points with some heatshrink or risk shorting, melting, and other bad things. To connect the wires to the battery terminals, I used spade connectors. Also, leave the terminals pointing up for reasons I’ll point out soon.
Once the soldering is done, connect the battery and use a multimeter to check the output on the USB connector (voltage across pin 1 and pin 4 should be +5VDC). Then you can freely connect a USB device and you’re set. You could stop here and be done. Since I wanted this for travel and didn’t want exposed wires, I took it a step further: enter hot glue.
Clean the top of the battery and add a layer of lubricant (e.g. WD-40) to keep the glue from sticking to the battery. We want the circuitry to be detachable so that we can recharge the 6V battery using a trickle charger/car charger. This is why I left the battery terminals sticking up – so that I can freely pull the circuit away from the battery. I used about 10 – 15 sticks of hot glue used on a mini gun, just to make sure that everything would hold together. This is the most time-consuming part. It doesn’t take a lot of thought to do this. Just fill in all the holes, keeping the USB port accessible. You also want to keep the heatsink partially uncovered so that it passing air can pull away the heat given off by the 7805 regulator. You could spend a lot of time getting this pretty by squaring up the sides and making it colored, but this was a last minute project for me. Hopefully you will get some good use out of this – I know I will. I hope they don’t kick me off the train thinking it’s a bomb.
January 3, 2023 at 3:09 am
We are best travel agency in India and tour operator offering travel services such as tours, Hotel Reservation, Air & Transportation. we help you travel around worldwide the way you want!!!.
visit our website For pacak enquiries: https://fliptrip.in/package/maldives
January 7, 2023 at 4:00 am
If you are struggling to do your homework you can grab the opportunity from our greatassignmenthelp’s experts whose are very focused to complete your homework help things. Many students in USA have less time to complete their homework which is why greatassignmenthelp.com have a unique assistance Pay Someone To Do My Homework Help , you can easily get by visiting our website. Well Yeah an America’s educational system has included homework for many years. It has been a habit for so long that at times it can be challenging to recall what it is. You might picture assignments given by teachers when you think of homework, but it isn’t the only option. Being an instructional author involves a significant amount of assisting students with their homework. You can provide pupils with on-the-spot homework assistance. At the last minute, you might locate a student and assist them in finishing their schoolwork. You are assisting Students in learning and development when you assist them with their assignments. Additionally, you’re encouraging kids to perform well in.
January 9, 2023 at 12:35 am
Great,
Assignment help
January 10, 2023 at 2:18 am
Commercial Law Assignment Help From Qualified Writers
Commercial Law is all about solving legal problems related to businesses, insurance companies, banks, governments, and commercial transactions. It ensures proper legal conduct that avoids fraudulent activities. Studying this branch of law and writing assignments on its complicated topics is not a cakewalk for students, and thus, they take Commercial law assignment help in the UK from Archlite. We have an excellent team of writers who have studied law at the UK’s famous universities.
visit us at – Archlite Assignment Help
January 10, 2023 at 4:17 am
Amazing post. We are service provider in the field of programming assignment help in UK. Our experts are well educated and professional experts and complete your assignment on time.
January 10, 2023 at 11:24 pm
Contract law is one of the major branches of legal studies. Therefore, students pursuing legal studies need to know the various aspects associated with contract law in which they are supposed to prepare an assignment on a contract law case study.
However, before they embark on this mission to prepare their contract law case study, they first need to dig deeper into the very concept of contract laws. Here’s a sneak peek into some important areas of contract laws.
January 10, 2023 at 11:24 pm
Contract law is one of the major branches of legal studies. Therefore, students pursuing legal studies need to know the various aspects associated with contract law in which they are supposed to prepare an assignment on a contract law case study.
January 11, 2023 at 4:22 am
Thanks for sharing the blog and this great information. Codes can be digital or
physical cards that you purchase from Microsoft or a trusted retailer.
https://microsoftcomredeem.com
January 14, 2023 at 8:07 am
Being addicted to drugs is such a mess in my life because I have no straight path to walk through.
I thought I wouldn’t change my life as an addict but when I encountered your rehabilitation center, my life changed.
From mess turned into a mesmerizing life. I am very much thankful because you helped me recover from addiction. I appreciate your
great services. I will truly recommend this to other people who also suffer from addiction.
January 16, 2023 at 12:07 am
Really appreciate this post, thanks for Sharing..
https://www.kolkatacallgirlservices.com/call-girls-in-kolkata.html
January 16, 2023 at 6:32 am
It’s actually a cool and helpful piece of information. Please keep us informed like this. Thanks for sharing.
https://www.guggy.in/
January 16, 2023 at 6:43 am
thanks for your help this was so helpful
January 16, 2023 at 6:47 am
not enough info that was good but not enough
January 16, 2023 at 8:37 am
Si experimentas con electricidad en casa debes tener cuidado. Asegurarte de tomar todas las medidas necesarias para no recibir una descarga o generar un accidente.
January 16, 2023 at 8:52 am
these batteries should be used with great care. Last week, mine caught fire. There should be much more warning to users about the dangers of these batteries.
January 17, 2023 at 5:23 am
what an amazing post. so well researched, impressed to have come across this blog. As a token of appreciation we would like to help you with pestle analysis assignment help.
January 19, 2023 at 1:46 am
Writing assignments is a demanding endeavour. However, refining and editing the work both demand equal effort. Many students struggle to achieve excellent grades because the assignments they hand in to their teachers are riddled with grammatical errors, spelling issues, inappropriate vocabulary usage, inappropriate informational flows, and erroneous sentence fragmentation. It’s time to get A grades in your writing job with our assignment editing services if you too have lost valuable grades as a result of faults in the assignments. Since a long time ago, Instant Assignment Help has provided the UK with incomparable essay writing services UK.
Related tool:
essay typer
January 19, 2023 at 1:47 am
It is always advisable to opt for Mechanical engineering Assignment Help rather than wasting time on your academic work on your own because it would just waste your time and also it will make you frustrated, so stop doing this and ask for help from the experts who can help you out in the most effective way.
January 20, 2023 at 7:05 am
888 Management provides Miami, Florida high end escorts, companions and promotional talent. All staff has been properly vetted, verified and reviewed, working with 888 you are assured of punctual, reliable, enjoyable and satisfaction guaranteed outcomes in Miami, Florida.
January 20, 2023 at 11:22 am
How can customers Recover my Sbcglobal email account?
The customers can Recover my Sbcglobal email account by first Login att.net to SBCglobal.net. It is an important fragment of Mail. Whenever customers search for it, they will be redirected directly to the Yahoo Mail login page. The registered account holders are requested to search the Yahoo Mail Attachments page to sign in to their accounts.
January 20, 2023 at 8:17 pm
I used cocaine for the first time. It didn’t phase
me and I began using cocaine at school and eventually got enough so
that I could make some extra cash. One of my mistakes was bringing this substance to school to sell to my classmates.
I was very “successful” but the principal caught on and long story short, I got kicked out of school.
My family was furious. I continued my schooling at home and
did quite well. My family thought it was all over there.
But it did not change who I was spending my time with.
It did not change my relationship with drugs and alcohol.
At around five days sober, I checked into an inpatient treatment program.
I learned that I had to get sober not for other
people or to look good in the face of my wreckage that I had to get sober for myself.
Most importantly, I had to learn that I was worth it and to my classmates too.
I am truly very sorry for what I’ve done.
January 23, 2023 at 3:18 am
Yes, I agree with this article, and this article is very nice and informative. I will make sure to be reading your blog more.Berbers strains You made a good point, but what about the other side? !!!!!!THANKS!!!!!!
January 23, 2023 at 4:42 am
I appreciate you giving this comprehensive extended bettery guide. I’m so happy to hear that you were able to complete your assignment effectively. I’m motivated by your inventiveness to undertake a similar project. For such an endeavor, you must always have the appropriate tools. I really know of a place named Autozone that sells incredible tools and accessories. I always buy my batteries, accessories, and tools from Autozone since they have such a wide selection of products and such great deals. For example, you can receive autozone coupon code 40% . Hopefully it was useful.
January 24, 2023 at 2:43 am
Nice Blogs Posting
https://www.soniyathakur.com/
January 24, 2023 at 2:45 am
https://www.soniyathakur.com/
January 24, 2023 at 3:44 am
For all the costumer amazing admirable full services I provide through my captivated figure and busty looks, I would let you keep your fantasies in hiding your eyes or heart. Noida Escorts Service You can use a well-known among all happiness seekers with me widely.
January 25, 2023 at 5:41 am
Student Life Saviour is best in assignment writing service in South Africa to all the South African students at affordable prices.
January 25, 2023 at 5:44 am
Australian Assignment help offers do my assignment assistance to Australian students at affordable prices.
January 30, 2023 at 1:48 am
Really great blog! This article is helpful for everyone. Well, myself Jaccy mice and I am a professional Statistics Assignment Helper in USA. Thanks for mentioning it.
January 31, 2023 at 3:50 am
Great post.Thanks for sharing.
January 31, 2023 at 3:50 am
Order wines online at The Melbourne Wine Store, best selection of wines locally and from around the world. Buy Now.
February 1, 2023 at 4:37 am
Really informative post that I found, it is the perfect post for getting ideas and tips for my knowledge. We provide academic writing services. Our experts are here to assist with, Online Assignment Help UK. We have a professional assignment helper. If you are facing problems with assignments. So, you can contact us.
February 1, 2023 at 10:33 am
Nice knowledge gaining article. This post is really the best on this valuable topic. the mystical teachings of jesus
February 2, 2023 at 12:49 am
Buy first copy watches in India of all swiss luxury brands. Shop branded 1st copy replica watches in India at lowest price. All over India COD delivery.
February 2, 2023 at 4:31 am
Can’t get enough of this website, they post one of the most informative blogs.
February 2, 2023 at 4:31 am
Can’t get enough of this website, they post one of the most informative blogs.
https://888companions.com/escorts
February 2, 2023 at 4:54 am
das
February 2, 2023 at 4:54 am
das\cxcaXXXXXXXXXXXXXXXXXXXXXXXXXXSQAASADEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEC
February 2, 2023 at 4:55 am
SDGAVRFSB
February 3, 2023 at 5:00 pm
Excellent Article Thank You For Sharing This Post If You Need Advice To Resolve The Problems Of Getting
February 4, 2023 at 5:46 am
We are the best assignment help online services for UK university and college students.
February 6, 2023 at 12:23 am
thank you for writing this piece.
February 6, 2023 at 12:24 am
I’m looking forward to finding out more. Amazing site! Keep up the excellent work. Shortly, I will focus on looking at a more significant portion of the issues.
February 7, 2023 at 4:46 am
A brand called Seint was founded in that year. Prior to 2020, it was known as Maskcara Beauty, but that name was changed to Seint. The company’s original mission was to support women in embracing their inherent beauty. The brand creates items that adhere to the beauty routine that any woman can appreciate rather than the unachievable ideals of beauty. Use the seint coupon code for significant savings if you’d like to receive a discount on your purchase!
https://thecouponly.com/store/seint-discount-code/
February 7, 2023 at 5:50 am
Powder helped to standardize otherwise unique spice combinations influenced A mixture of traditional yoghurt salt mint and few spices by regional traditions and chef’s preferences during the meal.
February 7, 2023 at 5:50 am
Powder helped to standardize otherwise unique spice combinations influenced by regional traditions and the chef’s preferences during the meal.
https://www.bindia.dk/asstes/image/take-away/raita.jpg
February 8, 2023 at 4:04 am
Peacock, unlike other streamers, will offer a unique tiered structure that includes a free premium ad-supported streaming service with subscription tiers that include more than 600 movies and 400 series, as well as live and on-demand content in news, sports, late night, and reality.
peacocktv.com/tv
February 10, 2023 at 10:04 pm
Beautiful and fit, our Mumbai Escorts are a cut above the rest. They don’t put their customers at risk by providing any services. They pose no health risk and are completely clean. When looking for a girl, we know that your health is a crucial factor. No one wants to ruin a good day by spreading germs that could potentially harm their health.
February 11, 2023 at 3:19 am
“Make your design dreams come true with figma resources! Use the platform to create beautiful mockups, icons and more – all within one user-friendly interface. With an extensive library of elements, it’s easy to customize designs to fit any project. Plus, the built-in tools make it straightforward to adjust and animate to suit the style of your project. Put the power of design in your hands and make something amazing today!”
February 11, 2023 at 3:20 am
“Make your design dreams come true with Figma Resource! Use the platform to create beautiful mockups, icons and more – all within one user-friendly interface. With an extensive library of elements, it’s easy to customize designs to fit any project. Plus, the built-in tools make it straightforward to adjust and animate to suit the style of your project. Put the power of design in your hands and make something amazing today!” figma resources