Paul Colby's latest activity
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Forget my previous post. I have fixed a few bugs and got the uA709 / LM709 working as a 5kHz voltage follower. Attached are the .asc and... -
Paul Colby reacted to Demystifier's post in the thread Graduate How to fix Relativistic QM so it's consistent? with
Like.
The main problem is how to define probability density for particle positions. QFT avoids that problem by saying that the theory at the... -
Paul Colby reacted to Andy Resnick's post in the thread Undergrad Can somebody explain this: Planck's Law in action with Like.
Yes, but the amount of energy radiated by the wire will be much lower than the sun. The amount of energy you need to absorb to protect...
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That is very sad. He was smart as hell and funny with it. I was on the end of his caustic wit a few times, as I am sure many posters...
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Paul Colby reacted to marcusl's post in the thread Graduate Project Progress Report and possible Radio Astronomy Technique? with Like.
There's no R in the formula for power, only for the voltage generated by a resistance. A resistor delivers a power spectral density S=kT...
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Paul Colby replied to the thread Graduate Project Progress Report and possible Radio Astronomy Technique?.Yeah, starting from scratch with enough competence to actually do the design work is definitely the way to go. Also, cooling everything...
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Paul Colby replied to the thread Graduate Project Progress Report and possible Radio Astronomy Technique?.This is a good question. I’ve done some experimenting separating the radios and shortening the cables from the clock generator. I’ve...
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Paul Colby replied to the thread Graduate Project Progress Report and possible Radio Astronomy Technique?.The total Johnson noise per Hz is ##4k_BTR##. For a perfectly matched network, only ##k_BTR## of it gets into the receiver. In this case...
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Paul Colby posted the thread Graduate Project Progress Report and possible Radio Astronomy Technique? in Astronomy and Astrophysics.Some 8 years ago I posted some experiments using 2 Software Defined Radios slaved to a common clock. The idea was measure small thermal...
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Paul Colby replied to the thread Undergrad Linear generator prototype.I finally viewed the movie clip in post #15. It’s difficult to tell the magnet orientation from the video. I now understand and agree...
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Paul Colby reacted to Baluncore's post in the thread Undergrad Linear generator prototype with Like.
The actual pole pattern of the individual magnets is essential to this analysis and discussion. It would be helpful if the poles of the...
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Paul Colby replied to the thread Undergrad Linear generator prototype.For a normal bar magnet magnetized along its long dimension, yes. However, I suspect the north (or south) pole of the magnet shown in...
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Paul Colby replied to the thread Undergrad Linear generator prototype.Moving the magnet he has on the outside of the coil might also increase the voltage generated. Putting a magnetic metal core through the...
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Paul Colby replied to the thread Undergrad Linear generator prototype.The magnets of the type shown are common in both in variable reluctance motors and in linear motors. Invariably the magnetization vector...
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Paul Colby replied to the thread Electromagnet magnetic field issue.Magnetic field lines are closed loops. The field generated (and the corresponding forces resulting) depend on the path reluctance of...