[Hardware Hacking General] aaricchavez:
That's what Windows is showing for all the adapters I have, and it's saying that my wired keyboard and mouse are each drawing 100mA, the same with the wireless adapter for a wireless mouse and keyboard(separate). According to your findings the KF only puts out 35mA.

Would the DC converter raise the current as well as the voltage?

I could wire it up to the KF battery, but it's still only putting out 4.4v.

I don't necessarily need anything to monitor the charge, I could calculate approximately how long it works for and/or do a test run and see when it stops working.

I charge all my devices at the end of the day, so i'd just plug them in at the same time, charging circuits have overcharge protection, so I won't need to worry. Just charge both at the same time.

I haven't gotten anything to work yet, not even a wired keyboard or mouse; i've tried with a regular external USB host cable, and the wires I have soldered on the board. But...I got that other Kindle yesterday to replace my motherboard and with this one I do get the 3.3v out when in USB host mode, I think there was something wrong with my other board.

And i'll be using a 32gb card, so I think it's worth it.

I didn't take measurements cause i'm modding the framing as I go. The space that i'm currently using for the adapter is about 1.75*0.75*0.5in, so I have a decent amount of space leftover after I put in the adapter.

I hooked up a resistor to a USB cord and plugged it into my computer and I got it down to 3.36v and the adapter was still recognized and able to be used, but I don't know about the current(I've watched videos on how to measure current, but apparently I don't quite get how to do it cause I never get a proper reading :/ ).

I bought about 10 different adapters, cause I wasn't sure how small they'd be once I took them apart and I wasn't sure if they'd all work with a 32gb sdcard. Only a few of them did work with it, and their boards all look pretty similar.

I'll check how much they're passing to the sdcard and report back.

I'm not sure exactly how i'd short out the regulator. ? I'll google edit if I figure it out.

If I did that, like I asked at the top of this post, what about the current?

I asked about this battery in my last post \, i'm not sure if you saw it or not, but it looks like it has a bord on it(it's the battery from the small 6th gen iPod Nano) http://www.ebay.com/itm/Replacement...er_MP3_Player_Accessories&hash=item43a883b975 . I have enough space to stack two of those on top of each other and *maybe* the adapter on top(I have space elsewhere it it wouldn't fit on top)

If I need a charge circuit for that, I could easily put this one in if I use two of those Nano batteries and then use a regulator with it. http://www.ebay.com/itm/Protection-...862?pt=LH_DefaultDomain_0&hash=item336ac821de

Here's a thought, could I grab power from the KF charger instead of putting in another charge port if I use a separate battery? Like hook up the GND and VCC pins on the KF to the battery/charge circuit so they'd charge at the same time.

Yeah, I have a class 4 32gb one that i'll be using.

I've never used USB host before because I don't want to have to carry around an extra cord plus the adapter, and then have it sticking out of the side when it's in use.

I don't know if you know, but the KF has no sdcard slot and only 8gb of storage that is split between /data, /system, /cache and /sdcard. By default there's only a little over 1gb of space for apps, that not really enough for me. Like this I can keep all my media on the 32 gb sdcard and then repartition /data to use most of the 8gb, plus without /sdcard all full i'll have space for multiple Gameloft games, instead of having to delete and copy each game's data when I want to play it. Or I can keep a nandroid on the KF itself instead of having to make space for it and copy it over whenever I need to restore.

Also, I don't know if I said this before or not, but thanks alot for your help guys :D