Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [calculation]

113 questions
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2 answers

Finding frequency response of inductive EMI sensor

I'm building an EMI sensor and trying to understand how it's done with the Elektrosluch. Here's the full schematic but this is the part I'm concerned about: simulate this circuit – Schematic created using CircuitLab I want to find the frequency…
Andrew Li
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7
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2 answers

What is a "charge cycle" of a lead-acid battery?

I'm trying to develop an algorithm that would roughly estimate the health of a lead-acid battery tied to an inverter backup system. It seems that my 200 Ah battery pack stays at 100% state of charge (SoC) most of the time. And when there is a short…
Davcroo
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What is the current industry practice regarding the impact of current-limiting fuses on arc flash calculations?

Suppose you have a panel. The arc flash incident energy for this panel is computed based largely on the available short-circuit current (SCCA) to the panel, and the protective devices upstream of the panel. Now, if there are current-limiting fuses…
Stephen Collings
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4
votes
2 answers

How best to perform calculation on voltage and feed output to segmented display?

I'm working on an audio electronics project that uses frequency modulation. A potentiometer will control the tempo/modulation speed, and I'd like to convert the voltage value to a triple-digit value in beats per minute so that it can be displayed to…
Gabe Fernandes
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4
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3 answers

Can I assume that groundings in electrical circuits can be split?

Assume there's a circuit like this: What I'm asking is if I can split the grounding points like this: The reason I want to do it is just for simplicity sake. I don't have an excellent physics background, but the grounding points like these always…
Seysen
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3
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3 answers

How to get the velocity with an acceleration sensor (ADXL345)?

I want to calculate the speed with the help of an acceleration sensor, such as a ADXL345. I thought that it should be integrated, but according to the information that I have received, it seems that this method is not correct. Do you have any…
Ho3ein H K
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3
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2 answers

Rewriting piecewise voltage function using Heaviside?

Recently I've had an idea to create an assignment where we have low-pass filter connected to the voltage source which is described by piecewise function. I've already dealt with periodic functions such as sinusoidal waveforms and square waves and I…
tom_ger
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2 answers

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 using CircuitLab There have been some posts on here…
dyode254
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3
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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 this circuit – Schematic created using…
MrBit
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Estimating junction temperature

I made a measurement using thermocouple to measure the case temperature of my TO-220 linear regulator (L7809). I'll be using degrees celsius for all temperature units and degree Celsius/Watt for all thermal resistances. Using 2 L7809 samples (or…
user139731
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1 answer

Rewinding a 6 V DC motor and decreasing inrush current

I have a small simple 6 V DC motor and I would like to rewind its rotor. The motor has 2 magnets. The rotor has 3 poles to wind. Normally each part has 169 turns of winding with 0.15 mm2 copper wire. My intention is re-winding those coils, but I…
Elentronics
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1 answer

Calculating hysteresis with an open drain comparator

I have a circuit as follows which will compare an input voltage to a 2.5 V (actually 2.3 V) reference. In one of the documents, it mentions that the feedback resistor must be 100 × Rpullup. If my Rpullup is 10k, that means my feedback will be R3 = 1…
Matty
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2
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1 answer

How to calculate RMS noise from datasheet?

I am using an AD9833 DDS as a sine signal source for my circuit. The bandwidth will be 3.5MHz. I would like to calculate the RMS noise of the DDS for my bandwidth. The datasheet has a SNR specification for a test frequency. The AD9833 can create…
FrüchteTony
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2
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2 answers

Energy calculation using Arduino

How I can calculate accurate energy if I have power, current and voltage values? This is the code of energy calculation, the result's it's wrong so how I can fix that? I want to measure apparent energy, I don't have a problem in V, I, P…
mohand zaatreh
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3 answers

Calculate power dissipation of split-supply op amp for sinusoidal input

I want to calculate the total supply current and power dissipation of an op amp in a non-inverting voltage follower configuration with a split supply: simulate this circuit – Schematic created using CircuitLab I know there are two components to the…
TypeIA
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