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This is a post where I could think of a lot of very funny names and titles, but when it came down to the actually writing one I chose the term I most often use in professional life. “First comes the Assumption Then It all Goes to Hell”. Very often the calculations and number crunching
Continue reading Theory Vs. Reality: First Comes the Assumpton Then It All Goes to Hell
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
Continue reading The Mechanics of a Loudspeaker
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
Continue reading Controlling the Speed of our rocket car – Part 1 Proportional Control.
Generic Feedback Block Diagram
We still have two basic opamp 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
Continue reading Understanding why cars reach a maximum speed.
Parallel LC “tank” circuit.
Yeah, I know it is a strange title! Actually there is a good reason of this title. Traditionally a parallel LC circuit is called a tank circuit because it is similar to water sloshing in a tank. The twisted sister part has to do with the duality principle I have
Continue reading Let’s get tanked and resonate with the twisted sister!
The series RLC circuit.
It is my sincere hope that my last post “Two, Four, Six, Eight We are going to Resonate” resonated well with you. (Sorry about the pun, sometimes I can’t help myself.) In this blog post I am going to build upon the last one and expand it just a little.
Continue reading Series RLC Resonance – The effect of Changing R
A fairly small relay.
Today I will take a step back into time, back before computers and even solid state electronics. The electrical properties have been there since the beginning of time. We have learned newer and better ways but often all we have done is the same things that were done before, but
Continue reading DC to DC conversion, what a buzz.
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.
Continue reading Circles and Cycles
The Impedance Triangle.
Alternating current added a new complication to Ohms law. If we are working with only resistance, there is no problem as long as we use RMS values for volts and current. The math works great including the calculation for power. However, as soon as we added inductance or capacitance things started
Continue reading The impedance, Z, and Power triangles.
Old Smokey – 70 VA transformer.
Tonight’s post is relatively short compared to last night’s post. Last night I wanted you to really understand how the load on the secondary is reflected back to the primary through the magnetic coupling. It was primarily about concepts. Tonight’s post will talk about one other function transformers
Continue reading Transformers – Part 2

