To better understand the behavior of a Passive Resistor Inductor / Resistor Capacitor I built another excel calculator….
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Passive HP/LP Filter calculator – More fun with Excel
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Category Archives: Awesome
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. 
Transistor Man
a whole semester summed up in one drawing
From the Art of Electronics second edition – Paul Horowitz and winfield Hill
Time to clean your office chair
I moved my chair into the sunlight for the first time in…
Sure enough it needed a cleaning. The casters were beyond cleaning, so new ones with Rubber wheels (for the hardwood) have been ordered.
This chair kicks serious ass!
my sister sent me ths
Gets me every time…
http://download.lardlad.com/sounds/season11/laughter29.mp3
Homer Finds a new Passion… dusting and polishing mixing boards
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.
Hairball build
All things considered the build is going well.
The leads from the supplied output transformer could have been longer… and if anyone knows a good way to remove paint for grounding posts let me know :-)
schadow switch mounting information
In the 70’s and into the 90’s WBS used a Schadow switch in almost every product they built. Different buttons required different offsets so “GOLDEN RULES” of design were made up so each engineer was on the same page. I found two of those pages the other day and was fascinated. These drawings are both done by hand and are admirable.
Turn table math
I thought this was very interesting
The making of Wilma – Part 1
Quickly Uploaded some pictures of the fabrication of Wilma
Here is the start of wiring up the channel buckets
As seen on a transformer today…
Learning to program FPGAs
I’m very excited to learn more about digital controls. The program I’m enrolled in has started VHDL and Quartus. So I can practice better, one of these babies in on its way.
Homework
you must visualize…
Well there’s your problem
Ever hear someone say “there’s something funny going on with that power?”
I think electricians are sometime intimidated when they see Orange receptacles. I’ve become sceptical of Orange receptacles without a label on them. Today I had just reason to explore a problem I had…
Wall Mount Bathroom Stand for iPad(R) with Paper Holder
Trick to remember NPN VS PNP
NPN: Not Pointing in
PNP: Pointing In
Will it fit? – Leslie 147
Audiophiles are…
“Audiophiles are the homeopathic healers of the electrical engineering world”
if your curious about the patents