The picture is not ok because the pins in the transistor must be: TAP, B, C (1,2,3) from left to right (clock sense).
Otherwise the PC powers off when I plug the USB cable.
With a correct position I don't find what I'm doing wrong. Now, with the schematic that the partner has sent, nothing happens, even bad. Perhaps it's the lamp and the intensity it needs. I don't know.
I'm going to check with another DC object.
I would be delighted if somebody could take a look on photos.
The power supply is in 6V (max. 1A in 12V).
Thanks again!