NEEEDDD HELP
Moderators: adafruit_support_bill, adafruit

NEEEDDD HELP

by Kpanchal on Tue Jan 01, 2013 11:12 pm

Hi guys,

We are students from a business school. For a project we need to create a product that really works. we are hoping to create a portable charger because we all have a passion for computers. We are really stick on getting the right resistors on apple products. We are using a 9V battery, l7805 voltage regulator, 2 75K resistors, 2 49.9K resistors, and a felmale usb. If anyone could help that would mean a lot to us as we have been trying to get this right for the last 4 months and had no progress :(

Once again a very big thank you! :D
Kpanchal
 
Posts: 3
Joined: Tue Jan 01, 2013 11:05 pm

Re: NEEEDDD HELP

by adafruit_support_bill on Wed Jan 02, 2013 6:33 am

We are using a 9V battery, l7805 voltage regulator, 2 75K resistors, 2 49.9K resistors, and a felmale usb.

I think the problem is the 9v battery. It will not supply enough current to charge an iPhone. You need a battery that can supply at least 500mA. 6x AA NiMH cells (7.2v) would probably work better.
User avatar
adafruit_support_bill
 
Posts: 29753
Joined: Sat Feb 07, 2009 9:11 am

Re: NEEEDDD HELP

by Kpanchal on Wed Jan 02, 2013 4:40 pm

would it work if i use 2 AA batteries and a 5V boost converter
Kpanchal
 
Posts: 3
Joined: Tue Jan 01, 2013 11:05 pm

Re: NEEEDDD HELP

by adafruit_support_bill on Wed Jan 02, 2013 5:25 pm

Yes. That is what our MintyBoost kit does: https://www.adafruit.com/products/14
User avatar
adafruit_support_bill
 
Posts: 29753
Joined: Sat Feb 07, 2009 9:11 am

Re: NEEEDDD HELP

by Kpanchal on Thu Jan 03, 2013 1:21 am

Would I need something on every pin on the booster or would it work with just the input, gnd and output
Kpanchal
 
Posts: 3
Joined: Tue Jan 01, 2013 11:05 pm

Re: NEEEDDD HELP

by adafruit_support_bill on Thu Jan 03, 2013 6:42 am

Would I need something on every pin on the booster

There are many boost converters with different requirements. Our MintyBoost has a detailed tutorial that explains how to build and use it.
http://www.ladyada.net/make/mintyboost/
User avatar
adafruit_support_bill
 
Posts: 29753
Joined: Sat Feb 07, 2009 9:11 am