I finaly made it after i had to order new diodes.
My SDRIVE-MAx runs with a shottky diode of the type 1N5817 in the 5V line and a BAT85 in the Data Input - TxD line.
I test it with my 800XL with Ultimade1MB with a power converter from the Abbuc the SDRIVE-MAX was directly connected to the computer. I test it with ATR images like RealDOS up to POKEY divisor 0 , BIBODOS,... and with .CAS file like GREENBERRET,AIRWOLF,TRUST and THE DOMAIN OF THE UNDEAD.