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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

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Buoyancy and Archimedes’ Principle.

Buoyancy of a partially Immersed container

Before I get into the material of this post I need to make one announcement. For some reason Hotmail and related services seem to be not delivering a lot of the e-mails for the subscription service. When I get one of those I unsubscribe the e-mail address. It

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The Mechanics of a Loudspeaker

The cross section of a Loudspeaker

In the last loudspeaker post, “The Electrical Part of a Loudspeaker” we “divorced” the mechanics from the electrical part of the speaker. But like good divorce judges we are now going to listen to the other side of the story. The picture to the left shows a cross

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The Electrical Part of a Loudspeaker.

The cross section of a Loudspeaker

Dearly beloved we are gathered here today for a divorce. Well, sorta. It is not just a simple divorce we are going to keep the parts we want and deal with the other parts at a later date once we want to complicate our life. Seriously, the

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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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Understanding why cars reach a maximum speed.

Generic Feedback Block Diagram

We still have two basic op-amp circuits to talk about. The problem is these two circuits have names associated with math terms. As usual I am going to do everything backwards. Math is normally taught before a reason is given to understand the math. But no, I can’t do it

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Circles and Cycles

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Sine and Cosine.

I created a video over the weekend showing the relationship of a sine wave to a cosine wave. The cosine wave is shifted 90 degrees from a sine wave. (Think Capacitors and Inductors!!! Deja Vu all over again!!!)

First, I create the two waveforms using the unit circle method and CAD.

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Calculating the “Hinge Boom” on the crane.

The angle from the cables to the new frame.

In the last post about the crane, “Using CAD in initial design – More work on the Popsicle Crane“, we determined all of the angles necessary to calculate the forces on all the beams and cables. In this post I will calculate all those forces

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Parachute Cord and Popsicle Crane Analysis

Face View of the Spring Scale

I spent some time analyzing the good the bad and the ugly of the popsicle crane boom test and there was some of all three. The main problem was the parachute cord stretching but I also did not have the angles I thought I did. First, the issue

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