Thursday, 19 July 2018

BAW!! #1 XOR

Hi everyone its the first week of Boards A Week and i am kind of excited to get underway.

The first board I want to make is an Exclusive OR (XOR) gate, and XOR gate is one of the basic logic blocks used in electronic design which normal comes as an IC package containing multiple gates like MC14070B. The truth table below shows how it operates.

Truth Table


Input A Input B Output C
0 0 0
1 0 1
0 1 1
1 1 0

The reasons I wanted to design this board is to help my understanding of how complementary logic works by using discreet components, so using resistors and FETs.




The full design files can be found at http://github.com/rabid-inventor/board-a-week. I have tried to include all the source material used, including the fonts I have used for creating the silk screen.  



I'm really pleased with how this little board looks and can't wait to have it made to see if my idea works. 

I can't wait to do more of these in the passive blocks in the future. 





Wednesday, 11 July 2018

Board a week !!!!!

One of the hardest things as a maker is to keep motivated to be able to push your skills forward, and being able to make all the mistakes in the world so that you can learn from them.

So to answer this never ending problem and to improve my PCB design and understanding of electronics is I will design one board a week and share it.



These are the rules I'm setting for myself.
  • For a board to be complete it has to be fully routed (which is where all the traces are liked)
  • The DRC and ERC are complete. ( these are the checking tools in PCB design software which help the PCB designer to check if the design and electrical layouts are sound)
  • Silkscreen labels complete.
  • To try some alternative CAD software instead of Autodesk Eagle which i'm reasonably used to.
  • Publish to GIT hub as Open Source Hardware 
I don't intend on having every design made of in some cases even populated but I'm going to try and choose one design from each month to send to production.

I'll be doing a blog post each week, and trying to explain some of my design decisions and some of the methods I have tried to use.

I hope you enjoy this journey with me.

Monday, 9 July 2018

New Beginnings

Well what can I say..

Long time no post doesn't really cut it so much.

But here I am again starting to get back into the swing of writing content :)

So let bring you up to date:
  • I no longer have the Shed that I made a few videos in I miss it but times have to move on.
  • I still run a PCB assembly at Pimoroni Ltd. in Sheffield which is still an amazing mix of fun, blood, sweat and tears.
  • I have really been practising coding in C, C++ and python.
  • Trying to get to grips with Bluetooth ( A big complicated beast).

New things for the future:

As normal time is never on my side . I really want to be more focused in what skills i'm improving for myself. The 2 improvements i want to make over the coming year are PCB design and embedded programming.


I have a couple of ideas to keep me motivated, I'll keep you posted.