DaveE's latest activity
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DaveE replied to the thread Multiple signals controlling relay.This sounds like a safety critical application. If so, I like the latching relay idea. You need one non-volatile memory bit that can... -
That suggests using a latching relay.
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DaveE reacted to gmax137's post in the thread I need a concave mirror with a focal length of 150 feet with
Like.
Get a couple more quotes/estimates. -
DaveE replied to the thread Collection of Lame Jokes.It's not lame, it's real life these days. But this seems to be the active joke thread so...
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DaveE reacted to sophiecentaur's post in the thread I need a concave mirror with a focal length of 150 feet with Like.
As you say, a reflector would be needed and not a lens, which can work on tree stumps (low down). Burning a section of a tree would...
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DaveE replied to the thread I need a concave mirror with a focal length of 150 feet.Just hire a tree guy, dude. Your concave mirror isn't an antigravity device, pieces will still fall, but in a much less controlled...
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DaveE reacted to Line_112's post in the thread I Why are continuously emitting radio pulsars not detected? with
Skeptical.
But in this case we are talking about sources of radio emission that a person cannot see, and a radio telescope does not care whether it... -
I understand now. Thank you!
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DaveE replied to the thread Help on reflection of a wave from fixed end without transmission.It doesn't even specify it's a string. Hence my previous comments. This is 99% simple trigonometry and 1% physics. We've done the math...
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DaveE replied to the thread Help on reflection of a wave from fixed end without transmission.No, but he was told the reflected wave travelled backwards and was inverted. So, ## \Gamma = -1 ##. My concern would be that he thinks...
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DaveE reacted to nsaspook's post in the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy with Like.
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DaveE replied to the thread Brian Cox lead me here!.missile = comet, I guess? https://earthsky.org/space/new-interstellar-object-candidate-heading-toward-the-sun-a11pl3z/
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DaveE reacted to kuruman's post in the thread Help on reflection of a wave from fixed end without transmission with Like.
You did not verify that what you wrote down is what you want. What you wrote as "opposite direction" is the answer. That's because the...
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DaveE replied to the thread Help on reflection of a wave from fixed end without transmission.Careful. This depends on the nature of the problem; the boundary conditions. Reflection coefficients can be positive or negative. I...
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DaveE replied to the thread A Advice for 100 MHz resonator.Since you are creating (or can measure) the 100MHz source of the fields, I would try a lock-in amplifier for synchronous detection of...
