Questions tagged [practical]
The practical tag has no usage guidance.
33
questions
0
votes
2answers
61 views
The mean value of phase noise as a stochastic process
What is the mean value of phase noise as a stochastic process?
Where can I get a theoretical analysis of this topic?
0
votes
1answer
111 views
Bypass LED with switch (why)?
I have a schematic attached that appears to show a switch bypassing an LED, or the other way around. In the working device operating the switch lights the LED and engages (as in turns 'on' a 'normally'...
0
votes
2answers
213 views
How to experimentally measure damping in RLC circuits?
I know there are methods to theoretically determine the damping factor and quality factor in RLC circuits. Equations such as
$$\zeta = \frac{R_s}{2} \sqrt{\frac{C}{L}}$$
$$Q = \frac{1}{2\zeta}$$
...
0
votes
1answer
36 views
What would be involved in rectifying electricity from a faulty car alternator?
Disclaimer: Newbe
As I understand things:
a car "alternator" generates a/c current
the alternator contains diodes that rectify the current to d/c current
if one or more diodes fail then the ...
1
vote
0answers
54 views
Question regarding dielectric breakdown (especially for stun guns)
This question occurred to me after looking at some models of stun guns. What I noticed was that some of them like one I bought had metal extensions sort of like prongs, or like tiny metal cones. I ...
0
votes
2answers
73 views
How to measure resistance with a multimeter?
This may be a very simple question. In my lab guide (I am a freshman Electronic Engineering student), we are supposed to build and analyze a circuit on a breadboard. First, we need to select some ...
1
vote
1answer
333 views
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 ...
0
votes
1answer
431 views
Can reverse voltage gain for a BJT be negative?
While observing the input characteristics of a Bipolar Junction Transistor(BC547), I observed from the graph that the reverse voltage gain came out to be negative. Is this possible and if so, what is ...
-1
votes
2answers
568 views
What is the simplest possible monostable 555 timer circuit?
Say for instance, the goal is to light an incandescent bulb for x amount of seconds (let's say 20).
What is the simplest configuration possible?
Of course, simple timer circuits aren't rare, and can ...
0
votes
2answers
250 views
MOSFET Biasing Problems
I am interested in finding Vgs for E-MOSFET for desired Id or/and Vds. Referring to those equations of drain current in saturation region, value of conduction parameter "K" would be nice to have but ...
0
votes
6answers
404 views
Time delayed deactivation of a circuit
In a simple electronic circuit with a momentary switched LED (or bulb, tube etc.); what can be done to trigger the LED for several seconds before proceeding to break the circuit?
In other words; I ...
0
votes
1answer
137 views
When to treat transformers as non-ideal?
For an experiment I need to sum a DC and AC Potential. My solution to this was to construct the following circuit:
simulate this circuit – Schematic created using CircuitLab
Testing this ...
3
votes
1answer
10k views
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 ...
2
votes
1answer
101 views
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\$) ...
0
votes
2answers
139 views
Get practial resistances for the Current Divider [closed]
My understanding
The resistance as seen through the load is just Rs, Therefore 60K <
Rs < 80K.
Is (current Through Rs Resistance)
IL (current through RL load)...
3
votes
2answers
393 views
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 ...
3
votes
3answers
462 views
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 ...
0
votes
2answers
556 views
Amateur question: how circuit analysis methods are applied in “complicated” circuits?
This will sound maybe stupid, but I'm amateur in electronics and I'm in process of learning.
I have previously analysed some basic circuits involving opamps, diodes etc.
Although some circuit looks ...
0
votes
1answer
288 views
practical concideration for op-amp differential amplifier
i'm trying to make a current sensor based on an op-amp differential amplifier with a unity gain (all resistors are equal so to have the best CMRR.)
The output of the op-amp differential amplifier ...
0
votes
1answer
399 views
Transistor active mode
I have been looking on the web but all I found was theory that I couldn't fully understand,nor apply .How can a NPN transistor be switched on in active mode?I would appreciate if you would give a more ...
2
votes
1answer
270 views
Op Amp high voltage output
Is it possible to output voltages in the range of kilovolts and current of atleast >1mA using an input of <10V on a consumer electronics op amp such as IC 741? If not, then why?
7
votes
3answers
871 views
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. ...
4
votes
3answers
691 views
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. (...
5
votes
2answers
480 views
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 ...
0
votes
1answer
444 views
Practice for complex electronic circuits [closed]
I'm self-learning electronics; I've watched Anant Agarwal videos and read his book and another book "Electronic Devices And Circuit Theory- Robert L. Boylestad".
But, now, I need to practice more on ...
1
vote
1answer
2k views
Is it practically okay to use darlington triple?
I need to control a very high current in my project. I'm planning to use darlington formation with three transistors.
I'm planning to use BQ24450 to charge a group of 12V acid-lead battery.
BQ24450 ...
1
vote
3answers
1k views
Increasing precision of a practical opamp circuit when the input signal is very small
I have a sensor which outputs a normally distributed baseband signal with cut-off frequency of 100Hz, whose mean is ~1mV and variance is (0.1mV)2. I want to amplify it about x1000 times by using TL084 ...
5
votes
3answers
828 views
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 ...
2
votes
2answers
835 views
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? ...
6
votes
4answers
6k views
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 ...
2
votes
1answer
745 views
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, ...
6
votes
3answers
10k views
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 ...
5
votes
3answers
9k views
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 ...
