It so happened, I became the proud owner of this device
CRESTA CTP 810And it seems to work well for its money ($ 100), but a sad defect was discovered (or the manufacturers might have conceived it). There is a full USB connector (OTG) on board that immediately wanted to connect a USB flash drive, Screw, 3G, etc. but unfortunately the tablet saw only the mouse and keyboard, and when connecting other devices, it hung tight or did not react at all. (((
In this topic, I want to describe how I achieved a normal connection of flash drives, and any other devices.
Inside, the animal turned out to be an ordinary Chinese, even though it was produced by a Dutch company.
After a detailed study of the insides of the device, it turned out that the power coming to the port is not at all 5 volts but just 3.7. (sad)
It was possible to make external power from a flash drive from charging (there was just 5 in.) As described in many forums. But then the flash drive can only be used stationary, and this is no longer good.
Rummaged through the Internet and not finding the scheme of the device, he decided to make a dc-dc converter (from 3.7 to 5) and place it inside the animal.
The board itself could be soldered, but it was too lazy to go for the details, so I took the converter's handkerchief from portable charging. We unsolder the board itself and see where the contacts go. On those contacts where the battery is soldered, you must submit 3.7 and where the connector gets 5 in., Everything is logical.
That's the way a miniature circuit for charging, it is suitable for our case
http://me1.at.ua/publ/1-1-0-5But the finished version
http://hobbyking.com/hobbyking/store/__788...rSearch=boosterSolder the input (3.7 in) shawls to the tablet ("+" and "-"). You can solder to the same USB (I will be powered by the WI-FI module, it was also 3.7 in.) We tilt the USB connector of the “+” connector from the native power supply. I just cut the track with a stationery knife (at any time you can solder everything back as it was). And solder the exit handkerchiefs to this leg (at the exit, I soldered only “+” Since the minus is common).
Hooray! The connector is now 5 volts.
Everything is now left to put the scarf inside. Its envelope allowed to shove it between the battery and the mat. Board and secure on double-sided tape.
We collect and check. Immediately after connecting the flash drive, she blinked happily, and the system recognized the Flash drive. Profit The 3G USB modem was also tested, which the system determined without any complaints.
There is no complete process, everything is shot after installation. Sorry for the quality of photos.
On other devices, you can repeat a similar operation, also with a mini USB, look for instructions on disassembling your devices on the Internet.
All that is written here is not an instruction, the author is not responsible for the damage done to your device.
My first post, do not kick much.
Post has been editedbitas1998 - 29.03.18, 18:54Reason for editing: Hid images under spoiler