We are back with some PCB making! Last time we were prepping the board so I will be exposing the board this time.
So I had my H-Bridge design printed out on transparencies using the highest DPI settings. I used a inkjet printer to do this, actually it does not really matter what kind of printer you use, just make sure it doesn’t leave small holes in your artwork.
Usually getting the right exposure time for you PCBs(Printed Circuit Boards) is really hard, and I had a board fail on me recently because I switched my transparent medium( The thing I use to press the transparencies onto the blank PCB ) from a glass plate to acrylic sheets. Before, I found my exposure time just right ranging from 9-14 mins, but after using the same exposure time on acrylic sheet mediums the board came out as a disaster because the photo resist didn’t hold. Here is a picture of the failure:
