Thank's for answers!
So my possibilities seems to be to use some separate measuring circuits or two separate L293's
with one for both motor and little bigger resistors like 1 ohm ?
I re-measured the stall current of the motor more exactly but it's difficult because axle seems still be slipping in wheels...
Current is very near 1A and current on "normal drive" <150 mA so with 12VDC and 1 ohm resistor by normal
drive voltage drops 1 ohm * 0.15A =0.15V , and when stalled 1 ohm * 1A = 1.0V if i did understand this right way ?
But that makes one watt so can my 1/4 watt resistor handle it for a very short period ? (only those i have now)
What about the VCC voltage of the L293? If the "earth" is +1V there will still be 4 Volts difference in circuit inputs
so i think i don't have to worry about that ?