Android <-> ADC USB isolation

TNT

Member
Joined 2003
Paid Member
For last tests I did not use that cable - just straight commercial cables. Also, I tried with and without power added to via the isolator.

Yes, the whole ting is uncharted waters it seems. So many parameters...

I feel that it is strange that you get garbled analog audio - usually digital don't work like that.... its ,mote like on or off ;)

//
 
USB checks parity bit for each USB frame. If the frame is corrupted, it's dropped - causing missing data in the stream. I have had a few bad cables which caused currupted -> dropped packets. Since your device requests/sends packets every 125us (bInterval = 1), some dropped packets do not cause total loss of the stream, but an audible corruption.
 
Last edited:
  • Like
Reactions: 1 user

TNT

Member
Joined 2003
Paid Member
Okey, so here comes the resolution of the case...

  • I had turned the isolator backwards... how could I... :)
  • Yellow IKEA USB-A / USB-micro is no good.

I just changed this one cable and everything works like a charm.

Thanks for the support and learning along the way!!

Here it is... never thought there could be such a difference with a USB cable... such low speed also... well, well...

ikea_nono.jpg


Replaced by another no fancy black one from I don't know where....

Crazy....

//