In the original schematic the circuit is powered by 12v, i did several test , changed resistors but that didn,t help above 11 volts the leds started to light up in unpowered situation. To solve everything in one breeze i added a voltage regulator and it worked perfectly. Everyone can use the safetyboard where they want in the mains circuit like i do ( i use traco so the output is gone witin 15ms) or in the secundairy circuit. To power the board is a different issue. I prefer to power the board true the scanner powersupply. I,m thinking to ad a small transformator to make it universal. I,m not completely certain about it.
I will keep you all updated because i think everyone wants to have a save projector