Laser Engraver Forum

hello i m new here i have a chinease laser engraver , i had a 500mv laser on ,it was hard to have it burning by adjusting the focus so now i bought a 15w , it have it own power supply , so i made a bridge to connect it on my board , but now when a press on it goes off and off go on , to engrave ... i got the opposite ... like the black where the laser sould engrave it does not engrave , the white where the laser should be off it engrave i try benbox , laser cad , gbrl but only benbox work as software