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The Thermistor Circuit and Zener Diodes.

The Thermistor Circuit.

The thermistor circuit is complete! There are a few resistor values I want to check before I show all of of the values, but essentially the circuit is complete. This circuit will do everything we described in the last thermistor post, “One More Step Closer to Completing the Thermistor Circuit”. There

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Efficiency and Effectiveness and Solar Energy.

Tonight’s post was intended to kick-off a discussion about solar energy, but as I was formulating how I was going to present it I kept running into a word … efficiency. I know the thermodynamic use of the term very well, but we often throw the word around to mean lots of other things. That

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Putting the Head on the Crane Boom.

The Crane Boom is almost complete.

The crane boom is almost complete! I put off doing the most difficult part, the head or nose of it until last. The reason this part is the most difficult is it narrows in both directions. The base or butt assembly did not get any narrower across the

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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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Variation, tolerances, probability, and specifications.

The Normal Distribution or “Bell Curve”.

In the last post I did a lot of talking about specifications and tolerances of components and the “worst case” situation. After the article was posted I realized I probably should explain some about all those terms.

When a manufacture marks a tolerance specification on a component, he

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One more step closer to completing the Thermistor Circuit.

Block Diagram of the Thermistors.

In Basic Training in the Army there is a very steep hill you have to march up. Just as you think you are at the top of the hill, you realize it was not the top at all. It was a curve and as you round it there is

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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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Short term energy storage, time delays, and oscillations.

We are quickly getting toward the end of our talk the theory of the thermistor circuit and will soon move that into construction. While construction is interesting, it is tough to create frequent posts of interesting content, so we are very soon going to move into some energy storage components. In electricity those are inductors

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Modeling the Thermistor.

Steinhart-Hart thermistor equation

What is a model? Without taking the time to look up an official definition, I would say it is a representation of reality. (I am sure some women would like to argue that point with me, but when I wrote the definition, I was not thinking of THAT kind of model!

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Why I built the Crane Boom Hinge the way I did.

The Plan for the Crane Butt.

Last night’s post, Popsicle Crane Update 3 was almost completely about construction of the crane boom hinge end (the “butt” end – a real term used by the crane industry.) I realized on the way to work today I did not talk about why I did what I

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