Finished a project for school

I had to build a 1 watt Class AB – Amplifier for an Electronics devices course.   The school has an LPKF PCB prototyping machine to make these PCBs with.   I’m not going to turn down the chance to have the boards made up so any project that involves PCB layout, I will over do it! The machine does 2 sided boards and with a special baking process plates the holes.  I only learned this after I spent all the time making it single sided with a ground plane on top.  So many lessons learned on this one.

After two revisions and some trace cutting, she’s alive.  I used some Phoenix connectors on the board for connection.  I will never make a board without some simple way to connect or disconnect it. Also, the idea of a PCB copper heat-sink was a bad idea.  I imagine the copper has to be thin for the machine to router… so chunks of aluminium were added on the back.  Thing gets rather hot.  2014-07-27 10.50.17 Screen Shot 2014-07-19 at 3.19.09 PM


RLC calculator for components in series

I’ve been calculating a lot of components in series lately for an ECR255 class. I’ve also had to graph them on impedance diagrams and a power triangle.

In an effort to better understand the math I made a calculator for myself. Here is it for you to use and enjoy. If you see any problems please let me know. It was designed in excel 2011 for mac… there WILL be compatibility issues and I hope they’re minor.

How it works:

You can fill int the info you have in the orange boxes. Once the boxes are filled in the calculator should fill in the rest.

If you need to modify anything else, it’s all dependant on the orange boxes. I suggest a goal seek by modifying and orange cell.

Screen Shot 2014-07-06 at 9.36.44 PM




Screen Shot 2014-07-06 at 9.38.09 PM

Screen Shot 2014-07-06 at 9.48.54 PMScreen Shot 2014-07-06 at 9.49.10 PM


Screen Shot 2014-07-06 at 9.49.00 PM

Screen Shot 2014-07-06 at 9.49.16 PM