This is very Simple way to modification standart usb converter to OTG USB.
The most Mini or Micro USB to USB converters are not work if you want to use it for OTG converter, because the 4. pin of the micro usb plug is not connected.

This below is an original cable schematic :

If you want to use it for working OTG adapter you have to connect the micro usb connector 4. pin to GND (5. pin).

Like this below :

This schematic is working me. Let to try this stuff.

Original document USB OTG mechanical

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