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Transformers and mutual inductance, but probably no mutual admiration.

A SMALL STEP-DOWN TRANSFORMER.

Tonight’s post is about two coils tightly coupled on a common iron core. When the fields of two (or more) coils affect each other it is said they have mutual inductance. I thought seriously of embedding an old song by Teresa Brewer called “Mutual Admiration Society” but in the case

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Where is the biggest bang for the buck in solar energy?

Solar Energy Concepts

Tonight I thought I would start pointing the direction we will be going toward solar energy. Like in all projects the first thing to determine is where do we want to go. I am going to make the first assumption. We want to use our money in the most effective way

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Making a fixture to cut dovetail slots – Making the do-nothing machine manually

The Do-nothing machine base with hand cut slots.

I have read many many places that you can cut dovetail slots in a board by hand. They say use a saw to cut the outer edges and then use a chisel to remove the material in the center. That all sounds good, except I was

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A softer side of create-and-make… Teach your children.

Birthday Present

Tonight’s post is a more general one. We are approaching the “consumer holiday” season in America and many will be out buying toys for children. Consider an inexpensive construction project where you and your children can both participate. You will be teaching them a whole lot more than construction techniques. They will

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Scaling a Voltmeter (& an Ammeter)

A representation for our real 250 mV Voltmeter

In the previous post on Electrical Theory, “The Load affects the Process. (Electrical Theory and More)“, I introduced the idea that the load can affect the circuit. To show that we used a real life meter and datasheet and circuit designed to make things look really

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Some videos of Real Cranes & one note about electrical meters.

This is just a short post to kind of clean up a few loose ends. Besides, it is about time we had a “light” post. (Tastes great… less filling… something like that.)

Electrical:

First, I want to clear up something that was not said about the voltmeter. Most newer style meters use an amplifier inside

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Final Fitting of the first Do-Nothing Machine

Picture 1: The end of the last installment

Now that we have the shuttles completed and sliding freely in the base of the Do-Nothing Machine, we are ready to assemble it… or so we hoped. As normal, the way things actually happened, there were more unforeseen difficulties and a few self-created others. However, working

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A problem with scaling, and the popsicle stick project

Picture 1: Getting a feel for the strength of glued popsicle sticks

The whole idea of working with popsicle sticks was that they are relatively inexpensive and require little work space. I thought that it may be helpful to people little money and space to work with something to get some experience designing and

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Making the shuttles for the Do-Nothing Machine

Picture 1: Determining the taper.

Frankly, I really did not know how I was going to make the shuttles. The first problem was trying to figure out how to know how much to cut off some 1/2″ X 1/2″ square rod to make it fit within the routed groves in the base plate. The

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A good book and a good website.

I decided when I built this site that if there was better information somewhere else I would point toward it. That is what this post is about. I am going to recommend a book about using a router and also a very good website about popsicle stick bridge design.

The New Router Handbook

A router

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