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Brains not tools… Making an Enclosure for Electronics.

Step 1 Create the Plans.

Sometimes you just gotta do it yourself. Even if it probably makes no sense to do it. I spent a big part of the weekend building an enclosure box for the power-supply I have been using with the thermistor board. However,I consider it a success and I learned a

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

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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.

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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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An Op-Amp Datasheet part 2 – AC Values.

Non-Inverting Op-amp Amplifier

Several months ago I introduced op-amps to readers of this site with “The Non-Inverting Op-Amp Amplifier“. At that time we had only talked about D.C. Electricity. We started with an “ideal Op-Amp” and then I brought us back to reality and created a video about an op-amp datasheet. Since that time

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The Thermistor Board is Calibrated!!!

Final Calibration.

The Thermistor Circuit Board is Calibrated! I was able to successfully calibrate it at 0 deg C and 70 deg C. Now is the time to think about what went right, what went wrong and what is the next step, both for this blog and with this project.

What Went Right!

First,

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Bode Plots – Phase Margin and Gain Margin

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Sometimes it is very hard to not get “the horse ahead of the cart”. Very often in projects and design as well as learning multiple things must be accomplished at the same time, yet one of those laws of nature is matter can only be at one place at one

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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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Testing Testing Testing … Smoke ’em if you got ’em.

The component side of the Thermistor Board.

Sooner or later there comes a time… a time when you just got to plug it in and find out if it is going to work. Hence my title “Smoke ’em if you got ’em”. Success, no smoke came out. However,there has been more than one problem.

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The importance of Phase in the frequency plots.

The Lowpass filter for this discussion.

We have been talking about the phase shift when creating frequency plots, but it has not been given a lot of importance. Other than power-factor it really has not affected us that much. We have been mostly interested in the gain plot. That is just about to change.

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How I create all these graphs…. part 3 of 3

The current through the Parallel LC circuit for several resistance loads.

I posted the third of the videos tonight on how I create the graphs I use on this web site. Part 1 is the actual graphing software. Part 2 showed some additional Veusz features and how CSV files work and some “gotcha’s” about

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