Yes I have completed the wiring took me a long time but I have finally done it. Sadly the coil isn’t working , it keeps on burning up the fuses. I will keep on investigating why this isn’t working. But here’s a photo first!
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:
This post or let’s say series of post because the process will be split into different sections to make it easier to read.
Ok so now I have a design, but that’s pretty useless so how about we make it a reality.
First of all, I needed a blank photoresist board and those didn’t come in the sizes I needed which was 150×244.12 mm, so I just bought some Kinsten presensitized PCBs from my local electronics shop ( Cost about 81 HKD, not to bad when compared to RSonline prices ). It was the perfect height so I didn’t need to cut it horizontally which saved me a lot of work, I just needed to cut it to length at 245 mm.
I cut it by scoring it with the yellow cutter you can see in the photo, I scored each side about 30-40 times then I snapped it which was quite easy to do, I filed the edges afterwards. The fiber glass eats blades like crazy so I prepared a few backups and of course when doing such work take care not to breathe in the glass fiber dust which is a serious carcinogenic meaning it can cause lung cancer if you experience prolonged exposure.
Well now the next step is to expose the board which I will be doing in my next post.
Part 2 is out! Read it here.