tech99's latest activity
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tech99 replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.One of these terminals has an excess of electrons on it, waiting to "go". That is the initiation of the wavefront. We require electrons... -
tech99 replied to the thread Converting PSD into equivalent sound pressure for an underwater hydrophone.If you are actually measuring a noise-like signal, then the electronics must respond to the full sound spectrum and you need to know...
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tech99 replied to the thread Converting PSD into equivalent sound pressure for an underwater hydrophone.The measurement is of a single frequency, so that Power Spectral Density is not the appropriate measurement. All you need to measure is...
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tech99 replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.Where does the initial wavefront come from?
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tech99 replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.5 M frames per sec is not fast enough to capture the wave that travels down the wire starting from the switch, which takes just about a...
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tech99 replied to the thread Multiple signals controlling relay.As I mentioned, I am not too sure of the logic required for the MC ON setting and the manual ON setting, but can al;ster this as required.
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tech99 replied to the thread Multiple signals controlling relay.I am not quite sure of the logic for the case "When this button is pressed / switched to ON, the relay should turn ON if the last signal...
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tech99 replied to the thread Tuning anapole resonator question.I was wondering if you could briefly describe for us the operation of the device. Thank you.
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tech99 replied to the thread I Lightning rods -- how confusing can they be?.The text of the IEC Standard for the protection of buildings against lightning is reproduced here:-...
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tech99 replied to the thread I Energy of Electromagnetic Waves in Destructive Interference.It is interesting that where we have an interference pattern, such as from a knife edge or large aperture, individual bright zones can...
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tech99 replied to the thread I Lightning rods -- how confusing can they be?.Regarding the size of conductor, 50mm^2 copper strip will carry nearly all strikes without damage, and something like 10mm^2 will carry...
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tech99 replied to the thread I Lightning rods -- how confusing can they be?.Although we can demonstrate the ionising action of a point in the laboratory, practical experience says that the shape of the lightning...
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The problem with the cosine and sine rule technique for vector arithmetic, is that there are too many opportunities to get a sign wrong...
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tech99 replied to the thread Vector/Phasor Addition.If you sketch the triangle it can be solved using, first, the cos rule to find ther unknown length of side:- a^2 = b^2 +c^2 - 2 bc cos A...
