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May 6, 2011. 10:51 AMpdejongh
says:
Normally red is for positive and black is for negative. Please ask if you have anymore questions.
You can find schematics online. Plus this is very simple stuff. all you exactly need to know is the voltage regulator pinouts...
Good job. Exactly what i was looking for. (your pics are fine, kiteman has been posting stuff saying "bad pics") I wish i knew about instructables long time ago...
Feb 17, 2011. 2:06 PMPlayer.exe (author)
says:
Yes, you are right, but I forgot to add one, but for the circuit you just need to disconnect the built-in battery and connect it in series to two AA rechargeable batteries then reconnecting the new battery pack to the PCB.
This circuit has many flaws that I didn't notice when I submitted this design, so I am working on a new version that will correct them instead of adding new informations to this one.
However I will make sure to include schematics in my next Instructable.
This circuit has many flaws that I didn't notice when I submitted this design, so I am working on a new version that will correct them instead of adding new informations to this one.
However I will make sure to include schematics in my next Instructable.
Nov 23, 2010. 1:46 PMknexsuperbuilderfreak
says:
so does this charge the AA's and the usb item like a ipod at the same time? or does it use the batterys to help charge the i pod?
Nov 23, 2010. 7:33 PMPlayer.exe (author)
says:
It uses the batteries to charge the iPod. Originally this charger was designed as an emergency phone charger, because of the fact that I sometimes forget to charge my cellphone, so when I really need to make a call, my battery is already dead.
The idea of this charger is to provide enough energy for about one minute, which is normally enough for an emergency call, without needing to crank during that time, so you can be heard correctly by the other person.
I know this charger has a lot of problems, like the fact that it use two different types of battery to work, so it can be dangerous if used incorrectly. I already have a design for a more efficient emergency charger but I never had the time to submit it. I think I will be able to submit it just after Christmas, but I am not sure when exactly.
The idea of this charger is to provide enough energy for about one minute, which is normally enough for an emergency call, without needing to crank during that time, so you can be heard correctly by the other person.
I know this charger has a lot of problems, like the fact that it use two different types of battery to work, so it can be dangerous if used incorrectly. I already have a design for a more efficient emergency charger but I never had the time to submit it. I think I will be able to submit it just after Christmas, but I am not sure when exactly.
Mar 14, 2010. 5:55 AMbikeboy
says:
I found some constructive comments on the idea of using a 7508 here: www.instructables.com/id/MintyBoost!---Small-battery-powered-USB-charger/step2/The-Process-Come-up-with-an-idea/ and why a max756 IC is a good alternative.
Still a good instructable though : )
Still a good instructable though : )
Mar 15, 2010. 3:12 PMPlayer.exe (author)
says:
The 7805 convert the 9 volts from the battery into 5 volts, 250 mAh and heat, the regulator can make enough heat to melt plastic.
Instead, the max 756 IC takes the 3 volts, 3000 mAh (9 Wh) from two AA batteries and convert it to 5 volts, 1800 mAh . This way the remaining power is not used as heat but as extra energy to make it charge faster.
The reason I did not used a boost converter is because I couldn't get one at that moment, if I can make another charger I will try to get a good IC for it.
Instead, the max 756 IC takes the 3 volts, 3000 mAh (9 Wh) from two AA batteries and convert it to 5 volts, 1800 mAh . This way the remaining power is not used as heat but as extra energy to make it charge faster.
The reason I did not used a boost converter is because I couldn't get one at that moment, if I can make another charger I will try to get a good IC for it.
Feb 16, 2010. 4:27 AMWater Child
says:
hey could you GIVe me the sepecific name of the flashlight? cuz i looked it upon ebay and the first result was a silver one that looks like this, anyway could you send me a photo of the box it came in or something because i really wanna make this ....SOS
Feb 16, 2010. 3:09 PMPlayer.exe (author)
says:
That flashlight is not made by a specific company. I got it from nextech but I realized by opening similar flashlights made by other brands that the circuit was the same. It should work with any flashlight without problem.
great idea but I really don't need a usb port can I omit that part and just use it as a battery charger?
Feb 13, 2010. 8:15 AMPlayer.exe (author)
says:
Yes, just remove the 7805 regulator and the USB connector from the circuit.
This is a great idea, but I strongly recommend you re-make it and take better, in focus shots, as the blurry images really detract from the overall quality.
Jan 1, 2010. 4:58 PMPlayer.exe (author)
says:
Thanks, next time I will try to get a camera that can do macro photography.
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