A sample text widget

Etiam pulvinar consectetur dolor sed malesuada. Ut convallis euismod dolor nec pretium. Nunc ut tristique massa.

Nam sodales mi vitae dolor ullamcorper et vulputate enim accumsan. Morbi orci magna, tincidunt vitae molestie nec, molestie at mi. Nulla nulla lorem, suscipit in posuere in, interdum non magna.

The final analysis of a floating barrel. Flotation Part III

Bouyancy calcs for greater than 50% immersed.

Tonight’s post is the last of the posts about buoyancy and calculating the lift of a plastic barrel immersed in water. This shows the calculations for a barrel supporting a weight causing the barrel to be immersed greater that 50%.

The calculations are very similar to the

Continue reading The final analysis of a floating barrel. Flotation Part III

A Plastic Barrel Pontoon Raft – Part 2

Breaking down the Problem into important areas.

This post and video is a continuation of the previous post. However, it is also much more. By calculating the lift of a partially submerged barrel we can estimate how high our raft will float in the water and how much we can load the raft. To

Continue reading A Plastic Barrel Pontoon Raft – Part 2

A Plastic Barrel Pontoon Raft – Part 1

This post and video is the first of three describing a raft or platform supported by plastic barrel pontoons. This is the enjoyable part of the process; thinking of the idea and doing the rough calculations. The harder part will be the next video, do some more precise calculations. This is being done because I

Continue reading A Plastic Barrel Pontoon Raft – Part 1

A Right Triangle and the Pythagorean Theorem

A Generalized Right Triangle

Tonight’s post is another one on the subject of simple but very very useful mathematics and geometry. The right triangle can seen almost everywhere in the man-made world. Almost everything is build with straight lines usually running horizontally and vertically. Together those would from rectangles, but a rectangle is inherently

Continue reading A Right Triangle and the Pythagorean Theorem

A most useful tool and some announcements.

Measuring a coil diameter

Tonight’s Post is in some ways almost an embarrassment to admit. I have finally purchased a digital calliper and have found it to be one of the most useful tools I have ever purchased. Before going into details about that I have a few announcements to make about this website

Continue reading A most useful tool and some announcements.

Processes and Projects Part II: Hydroponics vs. Aquaponics

Hydroponic grown lettuce

This post is another general post about processes and projects. It is specifically about me making the choice this year to go with hydroponic growing of some vegetables. Originally I hoped to do aquaponics, but there are just too many difficulties to overcome in a short time and I wanted to

Continue reading Processes and Projects Part II: Hydroponics vs. Aquaponics

Processes and Projects.

Tonight’s post is a shift in direction. (Only momentary for those of you that want me to get back into the electronics… we will return.) I have been very busy the last month setting up a hydroponics garden. This is the first of a series talking about using the process of gardening to lead me

Continue reading Processes and Projects.

How a GFCI operates and why it requires no ground.

Magnetic field around a wire with the conventional current flowing into the page.

Way back, a long time ago, I started introducing the idea of inductance in a post called “Through the Looking Glass – Duality – The Inductor“. To start talking about inductance it is necessary to talk about electromagnetism and that is

Continue reading How a GFCI operates and why it requires no ground.

Grounding and Neutral in Power Wiring.

Partial diagram of typical wiring for a residence.

Recently I changed a setting on this blog to put no time limit for comments and I got a very interesting comment/question in the post: Ground, Common, Neutral, Reference, and Buses. I am not going to repeat the question and my answer here, but that question

Continue reading Grounding and Neutral in Power Wiring.

Using Qucs with a Non-linear Model of a Transistor.

The opening screen to the new video.

Tonight I posted a new video. The video shows how to find the parameter values for a non-linear model of the transistor. This is the best possible model. However, remember it is just a model and there is significant manufacturing tolerances in transistors. The simple model we

Continue reading Using Qucs with a Non-linear Model of a Transistor.