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Activity for MissMulan‭

Type On... Excerpt Status Date
Edit Post #286537 Post edited:
26 days ago
Edit Post #286537 Initial revision 26 days ago
Question Find Q point in common base BJT configuration
Suppose we have this graph: ![](https://electrical.codidact.com/uploads/34eS35VabSgkqjSCNoXJgMGR) How can we find the operating point (Q)?In common emitter collector we just draw a line from the vertical axis (Ic) at the point (0,VCC/RC) to the horizontal axis at the point(VCC,0) and where ...
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26 days ago
Edit Post #286531 Initial revision 27 days ago
Question Re model of transistor is the same in 2 different configuration
I was studying the Re model of a transistor: ![](https://electrical.codidact.com/uploads/D4dtG1oxSCoXYxppTFLSySY9) But the Re model for 2 different configurations (common emitter and common base )turns out to be the same! I don't know why I am really confused.How is this possible?
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27 days ago
Edit Post #286090 Initial revision 4 months ago
Question Identification of semiconducting electrical components
We identify semiconducting electrical components this way: The first digit represents the number of pn junctions inside the semiconducting device The two or more digit number starting at position 3 represents the searilized identification number In the second digit I have seen only diodes wi...
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4 months ago
Comment Post #285683 I cant this is homework.
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5 months ago
Edit Post #285683 Initial revision 5 months ago
Question Choosing Y value in photoresistor graph
I have designed a graph of the current in a photoresistor related to the brightness of light which hits the photoresistor. ![](https://electrical.codidact.com/uploads/iZ7zHeBq9TuyScWAkHKX283t) Our professor told us that it is more correct to draw the Current/Brightness graph than the Resistan...
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5 months ago
Edit Post #285325 Post edited:
6 months ago
Comment Post #285325 Star-Star and Delta-Delta topologies
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6 months ago
Edit Post #285325 Initial revision 6 months ago
Question Phase shift between phase and line quantities
In a 3 phase Star source-Star load circuit the phase voltage has different phase than line voltage and in a 3 phase Delta source-Delta load circuit the phase current has different phase than the line current.Why?
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6 months ago
Comment Post #285242 Yes the question is theoretical I want to understand what bandwidth of the signal means.
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6 months ago
Comment Post #285242 @#53661 i don't know if it is needed thats why i am asking.I dont have a clue on what "bandwidth of the signal" means here.
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6 months ago
Edit Post #285242 Post edited:
6 months ago
Edit Post #285242 Post edited:
6 months ago
Edit Post #285242 Initial revision 6 months ago
Question Bandwidth of serial signal
Suppose we have this stream of data.Let's assume the data stream lasts 1 sec. ![](https://electrical.codidact.com/uploads/GAKSKYDe3y6kCAeKJPr9APwc) How do we find the bandwidth of the data?Do we Fourier transform the signal in order to find its components in the frequency domain? Assume ...
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6 months ago
Comment Post #285171 Where should I ask it then?
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7 months ago
Edit Post #285170 Initial revision 7 months ago
Answer A: How can we grow this community?
1)When you search on Google about a specific electronics/electrical engineering question Codidact is not in the first choices so I think users should try to upload relevant content frequently and self-answering the question. 2)In chemistry.stackexchange.com you can ask a question and even answer q...
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7 months ago
Edit Post #285168 Initial revision 7 months ago
Answer A: How to treat data communication questions?
I may be a little bit biased on this one because it was my question which started this thread but : I don't think data communication question should be generally off-topic because it evolves binary logic and the way the data are sent/received is through electric signals.
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7 months ago
Edit Post #285155 Initial revision 7 months ago
Question Splitting of message inside the layers
Assume a app generates a message (stack on computer).Each layer of the sending entity will put then control information in the data depending on the protocol and transmit the data to the next lower layer . ![](https://electrical.codidact.com/uploads/9VT3qobzToaebSDMYBQ3PR9c) Each layer of the ...
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7 months ago
Edit Post #284982 Initial revision 7 months ago
Question Asynchronous connection question
Assume we have a channel and send 7-bit data(0100100) asynchronously with 1 parity bit(0).Suppose the start bit is 1.The end bits are in the same logic level with the idle state of the channel(0).How does the receiver understand the end bits?In my case the last 2 0s could have been the end bits but i...
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7 months ago
Edit Post #284865 Initial revision 8 months ago
Question What is minimum resolution here?
In this datasheet it says that the minimum resolution is 0.1uA for the 10mA range.What is this minimum resolution?Is it the sensitivity of the multimeter for the 10mA range?
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8 months ago
Comment Post #284818 I didnt go to university today and we had lab hours.In the laboratory we use a Protek IDM 505 and I didnt measure some circuits which are for homework so I am searching it online to see if I can find anything.
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8 months ago
Edit Post #284818 Initial revision 8 months ago
Question Resistance of digital ampmeter
Can we find the internal resistance of a multimeter ,when we use the multimeter like a ampmeter, from its datasheet? I am trying to find the internal resistance of IDM 505 and I went to the datasheet to the current section and the most relevant thing I could find was the accuracy but as far as I k...
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8 months ago
Comment Post #284253 Yes i am interested in the capacitance between the windings.How can we make it bigger?
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9 months ago
Edit Post #284562 Initial revision 9 months ago
Question Capacitors of voltage regulators
Assuming we have a voltage regulator : ![](https://electrical.codidact.com/uploads/qvcwiw5cLSoLWSigewwvvezS) Why do we have to ground Vin and Vout using 2 capacitors just like that?Co could be to provide a low resistance path to GND at high frequencies but what is the role of Ci?
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9 months ago
Edit Post #284545 Initial revision 9 months ago
Question Confusion with Wikipedia article on multivibrator circuit
A while ago I made a question about the monostable multivibrator .Lets get a picture of it: ![](https://electrical.codidact.com/uploads/v4DMcGETqrfhmKpAaqYjEoPx) When switch is closed it enters its unstable state and it eventually returns to the stable state However Wikipedia states that thi...
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9 months ago
Edit Post #284514 Post edited:
9 months ago
Edit Post #284514 Post edited:
9 months ago
Edit Post #284514 Post edited:
9 months ago
Comment Post #284514 I will put some labels
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9 months ago
Edit Post #284514 Initial revision 9 months ago
Question Find feedback of circuit
I have this circuit: ![](https://electrical.codidact.com/uploads/nk1CTmvqhfvpNqhUvgbaea2x) I think that R3 acts like a feedback path from the output to the input.However I am not sure what will happen if I change the value from 100Ohms to lets say 1kOhms. I have this image in mind: ![](ht...
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9 months ago
Comment Post #283942 "...how to make it because there are not genuine current sources in nature...".I disagree . A photodiode is a current source in photovoltaic mode.
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9 months ago
Edit Post #284253 Post edited:
9 months ago
Edit Post #284253 Initial revision 9 months ago
Question Capacitance gain using conductive core for inductors
I have learnt that if we have 2 parallel conductive plates and we seperate them the capacitance is increased if we put a good conductor between the plates. Now the resonant frequency of a inductor(1mH) is about 100kHz which doesnt make it practical for application when the desired output frequency...
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9 months ago
Edit Post #284219 Post edited:
9 months ago
Comment Post #284219 @Olin Done!It has been fixed
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9 months ago
Edit Post #284219 Post edited:
9 months ago
Comment Post #284219 @Olin i dont think it is possible in Multisim NOT to make any zig-zag .
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9 months ago
Edit Post #284219 Initial revision 9 months ago
Question Change of pins in monostable multivibrator
In monostable multivibrators we use a trigger signal applied to the base of the transistor which is usually off to enter the astable region ![](https://electrical.codidact.com/uploads/UTmX2yRXNrZ9cnWP5aWWYi4J) Can we instead have a pin which is connected directly to the base of Q1 and when that...
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9 months ago
Edit Post #284207 Initial revision 9 months ago
Question Electrolytic vs ceramic capacitors about self-resonance frequency
Which capacitors have smaller self resonance frequency?I would bet my money on electrolytic capacitors because they are usually much bigger than the ceramic capacitors however I don't know if they self inductance changes as well so here we are asking this
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9 months ago
Edit Post #284196 Initial revision 10 months ago
Question Capacitance of inductor
What is a typical value for capacitance of a real inductor? Does this internal capacitance exist only under AC and not DC?
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10 months ago
Comment Post #284076 @Carl please clarify?Isnt it well written,correct or well presented?
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10 months ago
Comment Post #284076 Because it is useful if someone wants to ask something relevant to the question.
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10 months ago
Edit Post #284076 Post edited:
10 months ago
Edit Post #284074 Post edited:
10 months ago
Edit Post #284074 Post edited:
10 months ago
Comment Post #284074 Yes oops I will edit the image.
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10 months ago
Edit Post #284074 Post edited:
10 months ago
Edit Post #284017 Post edited:
10 months ago
Edit Post #284076 Post edited:
10 months ago
Edit Post #284074 Post edited:
10 months ago
Edit Post #284018 Post edited:
10 months ago
Edit Post #284076 Initial revision 10 months ago
Answer A: Parallel RLC circuit
It all depends on the values of the components:If ![](https://electrical.codidact.com/uploads/i8DAX2tLRnQV7eBAtFq2icWe) the system will very slowly decay until the energy of the system reaches 0. If ![](https://electrical.codidact.com/uploads/B6ExJnRcfsKJ7YkuCPD3pLqT) the system underg...
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10 months ago
Edit Post #284074 Initial revision 10 months ago
Question Parallel RLC circuit
How to find the equation of voltage of the top common node of R1,L1 and C1 after the switch is moved? ![](https://electrical.codidact.com/uploads/TevMpbc9kY6tse4mnkjBN8Cp)
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10 months ago
Comment Post #284018 They are not homework questions and I make the images on my own , it takes plenty of time in order to contribute to this site so please respect that.
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10 months ago
Edit Post #284021 Initial revision 10 months ago
Question Inductance vs frequency
Suppose we have a sine signal applied to a inductive load. Is the inductance of the load changed if the frequency of the signal is changed?
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10 months ago
Edit Post #284018 Post edited:
10 months ago
Edit Post #284017 Post edited:
10 months ago
Edit Post #284017 Post edited:
10 months ago
Edit Post #284018 Initial revision 10 months ago
Answer A: Series RLC circuit
It all depends on the values of the components:If ![](https://electrical.codidact.com/uploads/8ym42jU8HUER4jr6uEFSL2QW) the system will very slowly decay until the energy of the system reaches 0. If ![](https://electrical.codidact.com/uploads/mL9YkvUSVf8BH1MW96VuTu2V) the system und...
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10 months ago
Edit Post #284017 Initial revision 10 months ago
Question Series RLC circuit
How to find the equation of current of the RLC circuit after the switch is moved? ![](https://electrical.codidact.com/uploads/87iESoUu42B4bQo2FKTogWHp)
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10 months ago
Comment Post #283960 @Andy aka if you read the answer a little bit below that statement (which is true) i say we have voltages due to mutual inductance-> we can say that a current exitting the doted end of the inductor can be translated to a voltage drop from the dotted end to the undotted end.
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10 months ago
Edit Post #283958 Post edited:
10 months ago
Comment Post #283958 I mean how inductive coupling changes the total series inductance.
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10 months ago
Edit Post #283958 Post edited:
10 months ago
Edit Post #283960 Post edited:
10 months ago
Edit Post #283960 Post edited:
10 months ago
Edit Post #283958 Post edited:
10 months ago
Edit Post #283960 Initial revision 10 months ago
Answer A: Coupling of inductors
When 2 inductors share the same magnetic field they become coupled and besides their self inductance they have a mutual inductance as well. For this circuit: ![](https://electrical.codidact.com/uploads/9BbSeaQgDrCoxDMhzybYnxP9) Now current entering one coil marked with a dot, produces a ...
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10 months ago
Edit Post #283958 Initial revision 10 months ago
Question Coupling of inductors
Which will be the total series inductance? ![](https://electrical.codidact.com/uploads/ChgYqAphvBFCAyPoFG2m4tAM)
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10 months ago
Comment Post #283956 It isn't dimensionless im just doing the math.
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10 months ago
Comment Post #283956 I am using a LateX editor so I cant do what you want.
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10 months ago
Comment Post #283956 The (missing)units are obvious if you read the post.
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10 months ago
Comment Post #283956 I dont see any errors maybe you can enlighten me
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10 months ago
Edit Post #283927 Post edited:
10 months ago
Edit Post #283956 Initial revision 10 months ago
Answer A: Voltage and Current of capacitor
After the switch is closed: hi The general formula for finding the voltage of the capacitor is: hi where Vf is the voltage of the inductor after infinite time,Vo is the voltage of the capacitor at the time the switch is closed Because capacitors resist any change in voltage hi ...
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10 months ago
Edit Post #283955 Initial revision 10 months ago
Question Voltage and Current of capacitor
How do I find the voltage of the capacitor and the current through the capacitor after the switch is closed?
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10 months ago
Comment Post #283926 The circuit isnt wrong but what you have suggested is a improvement of the current source/switch relationship.
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10 months ago
Comment Post #283936 1) The current source provides 0.1A to the circuit but this could well have been a typo or you may have not seen it well which is partly my fault because I didnt write it brightly enough 2)the time costant is L1/R so the t/T must have units of Ohms*seconds/Henries
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10 months ago
Comment Post #283936 Olin maybe you may want to delete this post.
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10 months ago
Comment Post #283926 What do you mean by designators exactly!?
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10 months ago
Edit Post #283927 Post edited:
10 months ago
Edit Post #283927 Initial revision 10 months ago
Answer A: Current and voltage of inductor
After the switch is closed : hi The general formula for finding the current through the inductor is this: hi where If is the current through the inductor after infinite time,Io is the current of the inductor at the time the switch is closed. Because inductors resist any change in curre...
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10 months ago
Edit Post #283926 Initial revision 10 months ago
Question Current and voltage of inductor
How do I find the current through the inductor and the voltage of the inductor after the switch is closed?
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10 months ago
Comment Post #283904 Done check it out now.
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10 months ago
Edit Post #283904 Post edited:
10 months ago
Comment Post #283904 You are correct I will edit
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10 months ago
Edit Post #283904 Post edited:
10 months ago
Edit Post #283904 Post edited:
10 months ago
Edit Post #283904 Initial revision 10 months ago
Answer A: Select resistor for a diode
A diode obeys the Shockley diode equation and for this circuit we have:hi hi The current through the diode must not pass a limit so for LTL-307EE we go to the datasheet to find the maximum current before the diode is destroyed: For the LTL-307EE at 20C we have 10^4 A Isat and Vth=0.026V...
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10 months ago
Edit Post #283903 Initial revision 10 months ago
Question Select resistor for a diode
Suppose we have this circuit see me How do I pick a appropriate value for the resistor R1?
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10 months ago
Edit Post #283896 Post edited:
10 months ago
Edit Post #283896 Initial revision 10 months ago
Question Diode like a frequency mixer
Based on this paper on Wiki a diode can be described as a frequency mixer due to the exponential relationship between current and voltage.What I don't get from which point to which point do we measure the voltage with the different frequency(or whatever)? So if we connect a oscilloscope to the cir...
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10 months ago
Edit Post #283585 Initial revision 10 months ago
Question $Q$ and $\overline{Q}$ in bistable multivibrator
In this bistable multivibrator which is $Q$ and which is $\overline{Q}$?
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10 months ago
Comment Post #283436 Suppose we have a transistor connected in series with a magnetic tunnel junction.1st case:the output voltage is low(the transistor is off) (0V)this represents the case of no charge state.2nd case:the transistor is on and the 2 layers of ferromagnetic materials which create the magnetic junction, hav...
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10 months ago
Edit Post #283436 Post edited:
10 months ago
Comment Post #283436 @#53072iot if the charge state is 0, then we dont hav to worry about the spin state.Spintronics provide us with 3 available states unlike electronics which provides us with only 2 states.
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10 months ago
Edit Post #283436 Initial revision 10 months ago
Answer A: A signal with one mode or with three or more modes
> The term "Discrete" uses to describe a signal with two modes. Wrong. Discrete means it can only take some values , not all values. I suspect by 'modes' you mean # of possible outputs. If we have a system which outputs only have 1 possible output then what would be the point of that system?...
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10 months ago
Edit Post #283369 Initial revision 11 months ago
Question Tunnel current equation
The current through the tunnel diode is: hi where $I{f}$ is the current from the Shockley diode equation and $I{tunnel}$ is the tunnel current. Is there an expression for the tunnel current or is it found 'experimentally'?[]()
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11 months ago
Comment Post #283331 So a DC blocking capacitor to not allow any current flowing from the DC source to the AC source?
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11 months ago
Edit Post #283325 Initial revision 11 months ago
Question Adding resistance to varactor circuit
If we a varactor and we want to control let's say the resonant frequency of the circuit ,in my schematic we must add R1 correct?Else we create a low resistance path for current to flow not through the varactor so the "AC circuit" gets distorted from the "DC circuit". hi So by changing the val...
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11 months ago
Edit Post #283249 Initial revision 11 months ago
Answer A: 3+3 doesn’t show 6
The correct 1 bit full adder is this:hi
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11 months ago
Edit Post #283244 Initial revision 11 months ago
Question 3+3 doesn’t show 6
I have a problem which I don’t understand how to solve. I have this 2-bit adder, but when I select A1AO to be (11)2 3 and B1BO to be (11)2 3 and run it on Logisim it doesn’t show me 6. Instead it shows me 4. How can I fix it? hi
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11 months ago
Comment Post #283207 I know that.Is there a way to use the comparator(s) as 'effeciently' as possible(no loops,storage of value ) and make a simple logic digital circuit?
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11 months ago
Edit Post #283206 Initial revision 11 months ago
Question Division of binary numbers logic circuit
If we want to divide two numbers I have problem implementing this logic.I am posting 1 images with 2 different steps to the solution. In example a) the most significant digits of the divident >= divisor we subtract the divisor from those 2 digits. hello In b)the most significant digits of th...
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11 months ago
Comment Post #283172 I cant understand which pins to connect with which pins.
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11 months ago
Comment Post #283170 I think multiplication can be done without bit shifting just by using full adders and taking advantage of the vertical addition of 2 binary numbers.However we are missing the point here.Is there a similar 'function' which does the same for vertical subtraction?
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11 months ago
Comment Post #283170 I have heard that for division of binary numbers you need to understand well subtraction so just like we can multiply 2 numbers with full adders maybe we can divide 2 numbers with full subtractors thats why I want to know how to edo subtraction using full subtractors.
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11 months ago
Comment Post #283172 I know how to make a full subtractor i just dont know how to connect multiple of them in order to make subtraction of 2 binary numbers with more than 1 bit
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11 months ago
Edit Post #283170 Initial revision 11 months ago
Question 2 bit subtractor using full subtractor
Can we make a n-bit subtractor using full subtractors or if we want do subtract one binary from another we must use full adders and use the complement of the 2nd number to do the subtraction? I have only found examples which we use the complement of the second number and using full adders if it is...
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11 months ago
Edit Post #282738 Initial revision 11 months ago
Question Electric circuit with antenna
Moderator's note: This is getting ridiculous. You keep posting these drawings that are barely legible. The scribbling is bad enough, but the uncropped images are unacceptable. The image you originally posted below was 2500 x 1667 pixels, even though the drawing occupied only a small piece of th...
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11 months ago
Edit Post #282733 Initial revision 11 months ago
Question JFET equation of current
Is this equation valid only when a JFET in saturation mode , correct? because in the ohmic region the JFET acts like a voltage controlled resistor and increase in VDS increases the resistance of the JFET. Hi
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11 months ago
Edit Post #282711 Post edited:
11 months ago
Edit Post #282711 Initial revision 11 months ago
Question Diodes used in mixers
Suppose we have this circuit which is supposed to be an unbalanced frequency mixer. But how does the diode generate a signal with new frequencies at the output? Hi
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11 months ago
Comment Post #282710 An input signal can have noise and usually the noise is an AC signal so if im receiving dc signal+noise i would like to remove the noise.
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11 months ago
Edit Post #282709 Initial revision 11 months ago
Question Extract DC component of mixed signal
How can we extract a DC signal from a mixed signal?If we want to extract the AC component of a signal we can use a blocking capacitor to remove any DC offset but how do we achieve the opposite?Can we use a band-pass filter?
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11 months ago
Edit Post #282690 Post edited:
12 months ago
Edit Post #282690 Post edited:
12 months ago
Edit Post #282690 Initial revision 12 months ago
Question MOSFET differential to single ended converter intuition
How does the differential to single ended converter work? In order for the circuit to work, Q1 and Q3 must be in the saturation region and depending on the voltage inputs, one of Q2 and Q4 will be in the ohmic region and one will be in the saturation region. I understand that IQ1 is copied to (...
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12 months ago
Comment Post #282672 Yeah for you it may be easy I have tried learning MathJax and couldn't
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12 months ago
Edit Post #282671 Post edited:
12 months ago
Comment Post #282672 @#36396 I dont know how to use LaTeX and I used one of the online editors I found.I tried to find an online editor which didnt do that but I couldnt find one.
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12 months ago
Edit Post #282671 Initial revision 12 months ago
Question Voltage of tank circuit is invalid
In a previous question we found that for a critically damped oscillation: $$ I(t) = 2 t e^{-0.5 t} $$ But if we integrate to find the voltage through the capacitor: $$ V{CO} + \frac{1}{C} \cdot \int0^t{I(t)}dt $$ the integral is always a positive value which doesn't make any sens...
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12 months ago
Comment Post #282635 Thanks I understand now/
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12 months ago
Comment Post #282635 Sorry what you write doesnt make any sense to me.From KVL Vs=Vc+Vl+IR , I=0 and Vs=0 (no battery connected to the circuit)->VC=-VL->VL=-2V.
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12 months ago
Comment Post #282635 I still dont get it VL=-VC = -2V.
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12 months ago
Comment Post #282627 But the opamp can correctly function without the capacitor,correct?
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12 months ago
Edit Post #282624 Initial revision 12 months ago
Question Capacitor in 2nd stage of opamp
Inside a op-amp after the stage where the differential signal is converted to single ended , there is further amplification of the DC signal.For AC signals there is a capacitor parallel to the transistor.Why is it there?
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12 months ago
Comment Post #282585 Ok it is ready for reopening
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12 months ago
Edit Post #282585 Post edited:
12 months ago
Edit Post #282585 Post edited:
12 months ago
Edit Post #282585 Initial revision 12 months ago
Question Critically damped oscillation issue
I have a question about this circuit:(critically damped oscillation) SeeMe For a critically damped oscillation for a series RLC circuit the equation of current has this form I(t)=D1te^(-at)+D2e^(-at) where D2 =I(0+) and D1-aD2 = dI(0+)/dt=VL/L. Due to L1 :I(0)=I(0+)=0A and by applying KV...
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12 months ago
Comment Post #282434 How are the equations derived?I didnt get it.
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12 months ago
Comment Post #282363 Yes and Vout cant become less than Vin-.How can we fix this?
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about 1 year ago
Comment Post #282363 Excellent answer!But I have done some experiments on falstad and every time Vin+ becomes less than Vin- Q2 is driven to saturation and if Vin+ becomes more than Vin- Q4 is driven to saturation.Is that normal?
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about 1 year ago
Edit Post #282361 Initial revision about 1 year ago
Question Help with differential to single ended voltage converter
Hello I don't understand how this differential to single-ended voltage converter can work. What I don't understand is why we place a current mirror(a current mirror copies the current flowing through one transistor to another transistor) and how is the output voltage affected by the input volt...
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about 1 year ago
Edit Post #282262 Initial revision about 1 year ago
Question Unexpected phase shift in results
I find the current flowing through the capacitor $$\begin{align} I{C1}(t)&=\dfrac{\mathrm{d}}{\mathrm{d}t}\left[V1(t)-I{C1}(t)R1\right] \\\\ {}&= \dfrac{\mathrm{d}}{\mathrm{d}t}\left[\sin(t)-I{C1}(t)\right] \end{align}$$ and by solving this differential equation we get $$I{C1}(t) = \dfrac...
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about 1 year ago
Edit Post #282180 Initial revision about 1 year ago
Question Current and voltage in AC circuits without impedance
How can we find the equation of current and voltage of a capacitor circuit if the input voltage is AC without using the impedance formula Xc = -jωC?. SeeMe We have for homework to find the equation of current of the circuit and the equation of voltage of the capacitor assuming we just connected...
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about 1 year ago