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The Hinged Plate for the Metal Brake.

The design I am going with for the small metal brake

The old statement is: “Why are babies small?” Answer: ” So they don’t have very far to fall while trying to learn to walk”. The point of the statement is: When trying to do something new it is always best to try to

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Finishing up the Enclosure for the Power Supply

The final enclosure with everything mounted

Way back there I did all the sheet metal bending to form an enclosure box for my power supply. (Post “Brains not tools… Making an Enclosure for Electronics“). I did not like the power supply board open because it has 120 V on it in some areas and

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Piddling with the PID controller

A complete PID controller.

In this post I complete all the functions of a PID controller by adding the D to the PI controller in the previous post. If you have not followed all of the posts related to modeling the car and the cruise control, you will be lost at this point and

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Controlling the Speed of our rocket car – Part 1 Proportional Control.

Generic Feedback Block Diagram

Now that we have created ourselves a simplified model of a car in “Understanding why cars reach a maximum speed” we are going to replace the driver controlling the speed of the car with a control loop. All of the things going through our mind now have to go through

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Update on testing the thermistor circuit board.

The final version of the circuit.

All the troubleshooting is complete and the circuit is working well. They say experience is the best teacher… just too bad it comes too late. My dad has a related saying: “Experience is the best teacher, but it is a heck of a lot easier if it is

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Parallel Resonance Circuit and decibels.

Parallel LC “tank” circuit.

In the post “Series RLC Resonance – The effect of Changing R“, I talked about the Quality factor, Q. Q was defined as: Q= 2*π * energy stored per cycle / energy dissipated per cycle. Just like I did in that post we will take a look at what happens

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Learning the Arduino – The thermistor circuit.

Block Diagram of the Thermistors.

Way back there in November in a post called “Goals of Calibration of the Thermistor Circuit“, I used the diagram to shown in picture 1 to explain how I intended to linearize and calibrate the thermistors. I made one almost fatal mistake…I changed my mind. Seriously, I had intended

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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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Goals of Calibration of the Thermistor Circuit.

Block Diagram of the Thermistors.

Tonight is time to zoom out and look at the block diagram of the thermistors. When drawing a CAD drawing it is necessary to sometimes zoom in and work with details and sometimes necessary to zoom out and look at the overview. When designing parts of a process to

Continue reading Goals of Calibration of the Thermistor Circuit.