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how to build a portable charger. Does not work with iPod touch or iPhone
materials
-1x 150ohm resistor (optional)
-1x toggle switch (optional)
-1x LED (optional)
-1x7805 voltage regulator (required)
-1x 9v battery clips (required)
-1x female usb connector (required)
solder (required)
soldering iron (required)
project case (optional)
scrap wire (optional)
if you do not want to use the switch then u can just solder the positive battery lead to the left prong of the 5v regulator. If your not going to use the LED then you wont need the 150ohm resistor. You can just use the second method
listed below.
cost of products(not including the solder and the soldering iron and the project case) using first method: $16.06 (after tax)
cost of products(not including the solder and the soldering iron and the project case) using second method $9.47 (after tax)
I compiled my parts into an altoids mint tin
materials
-1x 150ohm resistor (optional)
-1x toggle switch (optional)
-1x LED (optional)
-1x7805 voltage regulator (required)
-1x 9v battery clips (required)
-1x female usb connector (required)
solder (required)
soldering iron (required)
project case (optional)
scrap wire (optional)
if you do not want to use the switch then u can just solder the positive battery lead to the left prong of the 5v regulator. If your not going to use the LED then you wont need the 150ohm resistor. You can just use the second method
listed below.
cost of products(not including the solder and the soldering iron and the project case) using first method: $16.06 (after tax)
cost of products(not including the solder and the soldering iron and the project case) using second method $9.47 (after tax)
I compiled my parts into an altoids mint tin
Thank you for your criticism I take it as if it were face to face. An electrical engineer looked at the project and thought that it was very well planned out and was constructed very well. Thank you so much for at least looking at my project .
Sincerely,
Andrew
When you are ready to post, there is an option to preview it first, and you would have realized that your pictures are too small to read the labels.
Just out of curiosity, why would you want to make a usb charger running off a 9v battery anyway? You could damage the device or battery since anything that comes with a usb charging cable it meant to charge off 5v, and the capacity of a 9v battery is about a quarter that of a single AA. Most devices these days draw at least 600 mA, but if you are talking about a modern smart phone ,tablet, or advanced media player, it's more like 850-1000 mA. So, in the case of the former, you will get about 50 minutes of charge time off a 9v battery, and in the case of the latter, it's more like 30 minutes, and you will be lucky if that's even one bar on the battery meter.