PCB UV exposure time calibration board

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:

DRSSTC Board Failure

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Game Review – Silent Hill : Homecoming

Some horror and gore elements are present below, viewer discretion is advised. For those who have played this game before. You must be asking : This game is old, why this again? For some reasons, I played Resident Evil when I was young. To be honest, early Resident Evil games were pretty scary ones. Some jumps from the nasty creatures can scare you to death. However, later Resident Evil series ware more like shooters to me. So does Silent Hill have the same fate as Resident Evil does? For me I think not. Although the fear factor in Silent Hill : Homecoming has reduced due to the ridiculously high combat skill of Alex. Silent Hill : Homecoming is the sixth installment from the horror game series “Silent Hill”. This game series is mostly famous because of its visibility, the bloody red environment and most of all, the atmosphere can completely correspond with the scene you are in. Silent Hill offers not only terrible monsters without faces, it also provides players to have the chance of dealing with different types of puzzles, where keys are hidden secretly somewhere. Actually, Silent Hill : Homecoming was released quite a long time ago. But still, its horror level is among the top these days. If you do not compare this game with the older games, this is pretty much one where you are going to have to anticipate for some unpredictable events. [Photo obtained from : https://www.ngohq.com/screenshots/15536-silent-hill-

homecoming-screenshots.html] SilentHill 2009-02-27 02-01-32-40 “Silent Hill : Homecoming. Alex was going after Josh, his little brother. Who was trapped in Silent Hill”

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Making of the DRSSTC H-Bridge: Part 1

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.

DRSSTC-Bridge Cut Boards

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.