Questions tagged [calculation]

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Off Grid Storage Capacitor Calculations

I'm thinking about using a very large home made capacitor as an energy storage device for a light duty off grid application, running some led lights and some 500w loads for a few hours each evening. I'...
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2answers
92 views

Air gap for a coil calculation [closed]

i would a help calculating the necessary air gap for a coil assuming an ideal magnetic material: Cross sectional area of active material = 100 mm2 number of turns= 30 Inductance= 1mH Thanks in advance
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0answers
34 views

Calculating Antenna Directivity Numerically

The equation for peak directivity of an antenna is this (example source) $${D = \frac{1 }{ \displaystyle \frac{1 }{4 \pi} \int_{0}^{2\pi} \int_{0}^{\pi} |F(\theta,\phi)|^2 sin(\theta) \, d\theta d\...
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1answer
40 views

Transistor Series Regulator calculation

I am new to electronics and have a limited knowledge. I tried calculating the values for a series transistor regulator to simulate in Multisim but still could not figure out a way to do this. The two ...
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2answers
39 views

calculating voltage or current for a plain transistor (no resistor)

the short version of my question is this: how do you know what the current through a transistor will be if there are no resistors? I am reading mostly the second edition of the Art of Electronics, ...
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0answers
41 views

Calculation of the resistors values in a voltage divider

I'm working on a circuit where a 3.3v flash memory, which comunicate with SPI protocol, has to be interfaced to an 8-bit PIC microcontroller working at 5v. For the MISO signal there should not be any ...
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1answer
46 views

Calculation of switching transformer at 100kHz

I am not able to desgin transformer for switching frequency 100kHz. It´s easy to desgin usual transformer for 50 Hz. But I´m totaly out when comes to switching transformers. What material should I use?...
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1answer
43 views

Battery life estimation

I have three AA 1,5V@2950mAh Alkaline batteries in series with a discharge rate of 3% per year. My circuit has a 3V3 LDO that will work until 3V6 is reached, so each battery will need to have at least ...
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2answers
112 views

Reverse Polarity Protection Circuit with P MOSFET and Zener

I have been trying to understand the operation of the following polarity protection circuit (Diagram doesn't show the internal body diode of MOSFET): simulate this circuit – Schematic created ...
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2answers
45 views

Minimal information energy conversions [closed]

I am trying to make a generator and before making it, I would need to know how many kWh it generates, in order to make sure it is actually feasible or if I should redesign it. I am just a highschooler ...
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0answers
70 views

Cable tray width selection as per NEC 392

I would like to ask if anyone know what is the meaning of the letter b used in the formula in the table 392.22 National electrical code 2017 article 392, pic (attached)
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2answers
121 views

Capacitor Vrms vs Vpeak Rating in Transformerless Supply

Why is it that when calculating for voltage across the capacitor in transformerless power supply we need to use peak voltage not RMS voltage value. To be clear I am referring to the rating of C1 in ...
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1answer
33 views

Nodal analysis for nonlinear elements

I have this circuit. I'm trying to find the \$I_{3}, U_{3}, P_{3}\$. For the nonlinear element I have this volt-ampere characteristics: \$ I_{3} = 3U_{3}^2 -U_{3}\$. That's what I am doing. Using the ...
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0answers
78 views

Copper Busbar, DC Copper Busbar [duplicate]

How can I calculate the current carrying capacity of a DC copper bus bar with respect to temperature? Bus bar specifications: Copper Busbar Width=40mm Thickness=6mm Ambient Temp5 (C)=4
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0answers
97 views

Comparator with hysteresis calculation

I'm trying to calculate the hysteresis of the comparator using currents but something isn't right. I'd like a little help to find the hysteresis thresholds without the simplified equations. simulate ...