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Yes, this is normal. When the chip is working to charge your gadget, it's going to get hot.
Normally you never get to see or touch the chips in your chargers so you don't realize how hot
electronics get.
Really, it's no rmal fo r the Mintybo o st to get ho t!
If you're concerned, you can always do the finger test above. If it's too hot, it will sizzle,
otherwise, it's OK.
When I plug in a device, sometimes theres a 'hum', 'hiss', 'squeak',
'whine', etc noise...is this normal?
Yes, sometimes the inductor resonates with the boost converter and that resonance leaks into
the audible range. While it's not good for it to always vibrate, it does happen occasionally and is
not harmful to the charging device. you can try moving the inductor a little with your finger but
the noise is electrical in nature so it's hard to stop completely.
Another thing is that it depends on how much power the device is drawing and what kind of
batteries are inside.
If this is a charger, why are the data (D+ and D-) lines used? Why
doesn't the 3Gs work with the Mintyboost v2, but the older iPhone
does? What are the pullup/down resistors used for, and which should I
use?
We have a full tutorial all about Apple gadget charging, check it out! (http://adafru.it/c3k)
Does the v1.x work with iPhone/iTouch? Does the v2.0?
Version 2.0 pretty much works with iPhones/iTouch devices but the v1.0 cannot because it is
not powerful enough. To get it working you will need the LT1302-5 which can provide 500mA
(compared to 200mA from the MAX756).
We have a full tutorial all about Apple gadget charging, check it out! (http://adafru.it/c3k)
Can I convert a v1.x kit to a v2.x? Can I use a MAX756 in a v2.x or a
LT1302-5 in a v1.x?
No, they are completely different designs requiring new PCBs are components, they are not
drop-in replaceable at all.
Why doesn't the v1.2 kit come with R1-R3 and LED1
These parts are optional: they are for the low battery indicator. There wasn't enough space to
add them to the PCB using through hole parts so they are surfacemount and on the bottom.
They're an 'extra' capability which you may add if you feel experienced with SMT soldering.
I'm trying to make/breadboard this kit on my own and it's not working!
HELP ME!
It is pretty much impossible to get good ouput from the kit if it is breadboarded. A custom PCB
or proper perf-board is essential. Most components cannot be swapped, and must be used as
© Adafruit Industries
http://learn.adafruit.com/minty-boost
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