c_mitra
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Today, 13:35This page http://hosting.astro.cornell.edu/academics/courses/astro201/earth_precess.htm says that the precession period is about 26000 years. ...59 replies | 1636 view(s) -
Today, 13:15c_mitra replied to a thread Single conductor inside hollow conductor in Elementary Electronic QuestionsThere is no way to ensure that the CT is not introducing any phase shift. So if you want to measure the phase of the current, you should not use the...39 replies | 2053 view(s)
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Today, 11:37Things can be confusing but I am not here to add more. In Cartesian space, you have motion on a straight line, kinetic energy is (1/2)m.v^2. This...59 replies | 1636 view(s)
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Today, 11:00c_mitra replied to a thread Single conductor inside hollow conductor in Elementary Electronic QuestionsI presume these are RMS values. I agree with what FvM says (#35) but it may not be a bad thing considering the simple design principles. But I...39 replies | 2053 view(s)
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Today, 10:37c_mitra replied to a thread Is it possible to make an IGBT to work at duty cycles up to 100%? in Power ElectronicsI presume you got the idea by now. If you see the waveforms in the typical datasheets, they do not appear square, they are trapezoidal. And there...17 replies | 804 view(s)
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14th September 2019, 15:38I am sorry that I am not understood. Motor is a source of energy. A gyroscope must be free (from external forces)- I am talking about mechanical...59 replies | 1636 view(s)
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13th September 2019, 06:21c_mitra replied to a thread would iron wire block high frequencies in Elementary Electronic QuestionsYes, but thin wires will have only a small effect. Imagine a straight long iron wire carrying some current. The magnetic lines of force will be...3 replies | 257 view(s)
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12th September 2019, 14:37c_mitra replied to a thread Is it possible to make an IGBT to work at duty cycles up to 100%? in Power ElectronicsRight. If you want a 100% duty cycle, why do you need a switch at all? It is not going to be turned off, right? But how a chopper is going to...17 replies | 804 view(s)
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11th September 2019, 14:46I believe the LEDs have already some form of heat sink- there is a central pad on the reverse which is expected to be soldered to a board (in this...45 replies | 1404 view(s)
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11th September 2019, 07:45I do not think the 24R is god-given; you need to calculate the value based on your current requirement. The reference voltage is 1.25V=700mA *R; that...45 replies | 1404 view(s)
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10th September 2019, 04:39I have discovered that graphical description is very helpful if you have questions. A single sine wave after rectification (full wave) becomes...2 replies | 286 view(s)
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9th September 2019, 13:54c_mitra replied to a thread 3 phase 4 wire(480V) AC to 12VDC (100mA) power supply for energy metering application in Power ElectronicsI do not see how it can be done in a simple way; you will certainly need 3 nos 1W 480V 12V transformers. The outputs can be paralleled via a diode. ...9 replies | 472 view(s)
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8th September 2019, 02:47True but the power to your home comes from a local (relatively) transformer that is perhaps a 3-phase to 3-phase one supplying perhaps 10-20 nearby...7 replies | 520 view(s)
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7th September 2019, 16:55c_mitra replied to a thread [SOLVED] Energy Band Model and Energy bond Model in Mathematics and PhysicsElectrons are labelled by their quantum numbers. All electrons in an atom has different quantum numbers. (quantum numbers in a molecule are labelled...3 replies | 379 view(s)
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7th September 2019, 16:35The majority carriers are coming from doping. On the p-side, the holes are mobile but the electrons are not; on the n-side the electrons are mobile...6 replies | 426 view(s)
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7th September 2019, 04:57Right. AND this tends to lower the junction potential. As the junction potential decreases, diffusion of majority carriers take place- that increases...6 replies | 426 view(s)
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7th September 2019, 04:44c_mitra replied to a thread [SOLVED] Energy Band Model and Energy bond Model in Mathematics and Physics1. No; energy band model is obtained for a crystal with no defects. Defects are introduced as perturbations. Defects are randomly placed and...3 replies | 379 view(s)
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7th September 2019, 04:27With ZERO external bias. There is an internal bias due to the junction potential. Yes, there is a continuous diffusion current and that is exactly...6 replies | 426 view(s)
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7th September 2019, 04:16Of course the temperature is increasing. The question is how much? If the resistor is well insulated, the heat produced will have nowhere to go...3 replies | 271 view(s)
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6th September 2019, 04:01c_mitra replied to a thread [SOLVED] Inductor quality value for switching regulators in Elementary Electronic QuestionsRight, in a field free space. But I do not know if the single straight wire of circular cross section is parallel to a metal object; or is surrounded...44 replies | 2381 view(s)
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5th September 2019, 16:07c_mitra replied to a thread [SOLVED] Inductor quality value for switching regulators in Elementary Electronic QuestionsI guessed it but it is wrong to call it "AC resistance" because of several reasons. 1. You cannot define an AC resistivity because it depends on...44 replies | 2381 view(s)
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4th September 2019, 18:08One of the reasons is when i am studying about Field Oriented Control in the internet they are suggesting to read the phase currents at the same time...9 replies | 692 view(s)
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4th September 2019, 10:29c_mitra replied to a thread [SOLVED] Inductor quality value for switching regulators in Elementary Electronic QuestionsI am learning new things. Do you have some reliable references where I can learn more about the AC resistance of copper? Resistance of metal...44 replies | 2381 view(s)
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4th September 2019, 06:03c_mitra replied to a thread [SOLVED] Inductor quality value for switching regulators in Elementary Electronic QuestionsTrue. For a comparison, metals like Ag, Cu and Au (the coinage metals) have more than a million times less resistivity (of the order of 1E-8) ......44 replies | 2381 view(s)
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3rd September 2019, 18:48void PwmInit(void) { /*Disble the pwm */ PTCON = 0x0; PHASE1 = (FCY/FPWM - 1); PHASE2 = (FCY/FPWM - 1); PHASE3 = (FCY/FPWM - 1);...9 replies | 692 view(s)
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3rd September 2019, 09:28c_mitra replied to a thread [SOLVED] Inductor quality value for switching regulators in Elementary Electronic QuestionsMost ferrites have very high electrical resistivity and that means that the eddy losses are very low. What you are seeing is called hysteresis...44 replies | 2381 view(s)
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2nd September 2019, 17:24c_mitra replied to a thread Thermal camera reading fet temperatures...how far away to hold it? in Miscellaneous EngineeringThe specifications says: "Field Angle / Shortest Focal Length: 27'×35'/0.5m Thermal Sensitivity: 0.07'C Measuring Mode: Thermopile Temperature...2 replies | 1425 view(s)
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2nd September 2019, 10:24c_mitra replied to a thread [SOLVED] Inductor quality value for switching regulators in Elementary Electronic QuestionsOf course I have a very very limited knowledge. So I looked up other places: 1. Wikipedia is reasonably decent reference. It says "In physics...44 replies | 2381 view(s)
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2nd September 2019, 09:07Yes it cannot convert simultaneously but samples all the channels simultaneously.9 replies | 692 view(s)
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2nd September 2019, 08:20I am referring to the micro dspic33EP256MC506 and the ADC module. There is a configuration for simultaneous sampling of 4 channels that is CH0, CH1,...9 replies | 692 view(s)
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