Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [practical]

37 questions
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Can I obtain a new voltage source from outputs of two cascaded linear voltage regulators in practice?

I have a device which works with 7V. I have a 7812 and 7805 already running in the circuit. Can I use the outputs of this voltage regulators to feed the 7V device? I know this is possible in theory. But most practical voltage sources can supply…
hkBattousai
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MIMO: How Can Two Antennas So Close Together Receive Different Signals?

I'm trying to understand how MIMO (as used by 802.11n wi-fi and some upcoming cellular data standards) works in practice. I understand at least the gist of the theory of spatial multiplexing. What I don't get is how it works in practice. Let's…
dsimcha
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Sample Application with LHI 778 PIR Sensor

For a motion detecting application I found a sensor with code LHI 778. If you look at the datasheet in the link, the characteristics of its internal FET transistor is not specified and there is no information about its internal sensor element. There…
Erdem
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Practical designs/practices for home electronics

I need an automatic voltage stabilizer. I'm thinking about building my own. I've searched the internet and consulted several books. The diagrams in books show only the bare bones, basic design that is intended to illustrate the principles of physics…
Kshitiz Sharma
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Why use only oversimplified/ideal equivalent circuits?

Most circuit analysis books use ideal resistor, inductor, capacitor and don't even bother to show practical circuits of these components, let alone any solved examples with practical circuits. For diodes, all of these books give examples for ideal…
JuliandotNut
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Difference between configurations of unity gain buffer using op-amp

Is there any practical difference as to how a unity gain buffer using an op-amp might be configured? For example, the input signal can be connected to the noninverting input and the feedback to the inverting input; but it can also be configured the…
Thomas O
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How do I learn to build practical stuff?

I am in my 4th semester of a 4-year undergraduate electronics rngineering program. All I have learned so far is lots of theory in courses such as analog electronics circuits, digital electronics circuits, signal processing. All we do in our labs is…
Koustubh Jain
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Why do they place a high current device in a low current package?

For instance, it is said that the practical current limit of the TO-220 device is 75A. But I frequently see MOSFET devices for which the specified maximum continuous drain current is above 75A. (Examples) Is there any practical difference between…
hkBattousai
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Difference between an ideal integrator and a practical one

I only learned about the ideal integrator design (top circuit), but when I searched for a practical model for an integrator I found it was like the one in the bottom circuit. Two new elements, Rf and Rs are added to the ideal model. I don't quite…
HelperKing
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What happens if I put my DC voltage source AFTER the diode instead of before?

I have a homework question on diodes, in which I have to calculate the Voltages across the diodes. All the questions I have encountered thus far have had the DC source BEFORE the diode. This one has the DC source AFTER the diode. We have to make…
Naynay
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Why isn't Ohm's law working for this simple circuit?

I have a 70W 12V-500V DC power converter, and something in these pictures is not adding up. I run the 500V output through a high-voltage 332kΩ resistor. Now, using the left multimeter I monitor the current through the circuit, and it runs up around…
feetwet
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The effects of Op amp Bias current

This is regarding an integrator op amp design, the rate at which the input voltage charges the integrator's feedback capacitor is 150V/s. I am trying to justify the minimum feedback capacitor value before the bias current (or whatever else) affects…
konobyBYnight
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How should I write a feasibility study report?

I may be called upon to write a feasibility study report for consumer hardware (to be manufactured) and/or a service to be offered to clients in the near term. What is the proper technique here? Google says I need to start by suggesting alternate…
Joe Stavitsky
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Finding the resistance of a practical inductor having its reactive power

Suppose I have a simple practical inductor as such: simulate this circuit – Schematic created using CircuitLab L is known. R is unknown and we need to find it. The supply frequency (say \$f\$) is known. Also the reactive power on the whole inductor…
steoiatsl
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Transfer Function of Non-Ideal Transformer

What is the mathematical relationship between primary and secondary windings? It can be either in the s-domain, or a time domain expression. This expression must contain all realistic parameters, like core losses, hysteresis losses, winding…
hkBattousai
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