Activity for MissMulan
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #287366 | Initial revision | — | 5 months ago |
| Question | — |
BJT common emitter amplifier equivalent circuit (π hybrid model) Im studying the equivalent model of a BJT common emitter amplifier at high frequencies.At university we tought that the BJT at high frequencies looks something like this:  However when designing a common emitter amplifier we h... (more) |
— | 5 months ago |
| Comment | Post #287302 |
Andy hi. I was taught it in university yesterday and I didn't understand it. (more) |
— | 5 months ago |
| Edit | Post #287302 | Initial revision | — | 5 months ago |
| Question | — |
Thermal stability coefficient The thermal stability coefficient is defined to be: $S = \frac{dI{C}}{dI{CBO}}$ where $I{CBO}$ is the reverse current of the BJT when voltage isnt applied to the base of the BJT. In case of a BJT biased with 2 sources $I{C} = \beta \cdot I{b}+(\beta +1)I{CBO}$ However my textbook says that $... (more) |
— | 5 months ago |
| Edit | Post #286859 | Initial revision | — | 8 months ago |
| Question | — |
Circuit which create ac sine wave from dc pulsed signal A full wave rectifier converts a sine wave to DC pulsed signal of double frequency. Is there a circuit which does the reverse process? (more) |
— | 8 months ago |
| Comment | Post #286836 |
@Elliot Alderson Editted. (more) |
— | 8 months ago |
| Edit | Post #286836 |
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— | 8 months ago |
| Edit | Post #286836 | Initial revision | — | 8 months ago |
| Question | — |
Need help design a digital circuit which divides two binary numbers Before the circuit here are the digital blocks which have been already designed and exist as part of the division block 1 bit subtractor:  2 bit subtractor(in the digital block diagram of the division block there is a 3 bit... (more) |
— | 8 months ago |
| Edit | Post #286792 | Initial revision | — | 8 months ago |
| Question | — |
Op Amp Hartley oscillator Im designing a Hartley oscillator this time with a opamp providing the open-loop gain.I have tried drawing the small-signal analysis of my circuit to use KVL and KCL to find the conditions of operation of my Hartley oscillator but now I am stuck.  |
— | 8 months ago |
| Comment | Post #286784 |
@a concerned citizen but arent they biasing resistors part of the input impedance of the circuit ?Why are we neglecting them? (more) |
— | 8 months ago |
| Edit | Post #286777 | Initial revision | — | 8 months ago |
| Question | — |
Results of analysis of Hartley oscillator dont make sense I want to find the conditions of oscillation of the following Hartley oscillator.I have attached a load (ZL) to my Hartley oscillator Image alt text I have written KCL for nodes A,B: For node A: $$\frac{V{A}}{sL{1}} + \frac{V{A}}{Z{L}}+\frac{V{A}}{R{C}}-sC{1}(V{A}-V{B})+g{m}V{x} = 0 \righ... (more) |
— | 8 months ago |
| Comment | Post #286765 |
Why do I need the IV curve?I have approximated the tunnel diode to behave like a resistor $$ R_{d} = \frac{V_{T}}{I_{s}}$$ from Vf to Vv and from 0 to Vp (more) |
— | 8 months ago |
| Comment | Post #286760 |
@#52987 Editted. (more) |
— | 8 months ago |
| Edit | Post #286760 |
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— | 8 months ago |
| Comment | Post #286760 |
@#52987 I tried but couldnt find a better image.I literally googled tunnel diode inductor relaxation oscillator.Now that I am thinking about it I will be back in a sec. (more) |
— | 8 months ago |
| Edit | Post #286760 |
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— | 8 months ago |
| Edit | Post #286760 | Initial revision | — | 8 months ago |
| Question | — |
Modelling tunnel diode relaxation oscillator I have been trying to model this oscillator  I was wondering if we can somehow predict the frequency of the oscillations.For small currents inside a diode from the Shockley diode equation $$ e^{x}-1 = x$$ -> $$I{D} = \frac{x}{... (more) |
— | 8 months ago |
| Edit | Post #286745 |
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— | 9 months ago |
| Edit | Post #286745 |
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— | 9 months ago |
| Comment | Post #286745 |
@#36396 Editted. (more) |
— | 9 months ago |
| Edit | Post #286745 |
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— | 9 months ago |
| Edit | Post #286745 | Initial revision | — | 9 months ago |
| Question | — |
DC-DC converter using Hartley oscillator and transformer Instead of using a buck or a boost converter can we use for DC-DC conversion the circuit Im going to describe in the next lines? First we begin with a Hartley oscillator whose output is fed into a transformer with N:1 turns ratio between primary and secondary windings. Then we rectify the voltage ... (more) |
— | 9 months ago |
| Edit | Post #286738 |
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— | 9 months ago |
| Comment | Post #286738 |
@#52987 you are correct a BJT doesnt have a CE junction I used too literally the small signal analysis of the BJT. (more) |
— | 9 months ago |
| Edit | Post #286738 | Initial revision | — | 9 months ago |
| Question | — |
Small signal analysis of BJT in saturation region The small signal analysis of a BJT when the BJT is in amplification mode:  is easy.However what happens when the BJT is in saturation mode?  Can we rep... (more) |
— | 9 months ago |
| Comment | Post #286730 |
It is a exercise I made up to learn about filters. (more) |
— | 9 months ago |
| Edit | Post #286730 |
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— | 9 months ago |
| Edit | Post #286730 | Initial revision | — | 9 months ago |
| Question | — |
Design high -pass filter with 2 points of the bode plot Im designing a high-pass filter which has a gain of -8dB at half of the roll-off frequency and I am stuck ,I dont know how to continue the design. In the bode plot of that filter we have 2 points:1 is at (fc,-3dB) and the other is at (fc/2,-8dB).What information must I extract to find the transfer... (more) |
— | 9 months ago |
| Comment | Post #286724 |
@a concerned citizen it is a EE question.Why does it matter why I want to ask the question? (more) |
— | 9 months ago |
| Comment | Post #286721 |
Ya I agree Q will be really high. (more) |
— | 9 months ago |
| Comment | Post #286724 |
I am designing it for fun. (more) |
— | 9 months ago |
| Edit | Post #286721 |
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— | 9 months ago |
| Edit | Post #286724 |
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— | 9 months ago |
| Edit | Post #286724 | Initial revision | — | 9 months ago |
| Answer | — |
A: Band pass filter given cutoff frequency and bandwidth My mistake was taking the third relationship $$ \frac{1}{RC} $$ which says how to find the bandwidth of a parallel RLC filter but we have a series RLC filter. Now solving the system : $$ LC = 100020001 , \frac{R}{L} = 2 $$ gives us the correct ratio between C1 and R1 and L1 with more detail: ... (more) |
— | 9 months ago |
| Edit | Post #286721 |
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— | 9 months ago |
| Comment | Post #286721 |
No I don't mean center frequency I mean bandwidth of the pass band filter,the range of frequencies at which the attenuation is higher than - 3dB (more) |
— | 9 months ago |
| Edit | Post #286721 | Initial revision | — | 9 months ago |
| Question | — |
Band pass filter given cutoff frequency and bandwidth I have decided to try design a band-pass filter with a cut-off frequency of 10kHz and bandwidth of 2 Hz. Image alt text $$ \frac{1}{\sqrt{LC}} = 10001 \rightarrow LC = 1/100020001 sec^{2}$$ $$ \frac{R}{L} = 2Hz$$ $$ \frac{1}{RC} = 2Hz$$ Here is what I have done but if I plug the value... (more) |
— | 9 months ago |
| Edit | Post #286705 |
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— | 9 months ago |
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— | 9 months ago |
| Comment | Post #286700 |
@a concerned citizen I am just trying to explain to you what is inside my head. (more) |
— | 9 months ago |
| Edit | Post #286705 |
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— | 9 months ago |
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— | 9 months ago |
| Edit | Post #286705 | Initial revision | — | 9 months ago |
| Question | — |
Finding voltage gain of Hartley oscillator I am trying to find the AC analysis of a BJT Hartley oscillator but I cannot continue. How do I find the voltage gain? When no feedback is there, we just find the output resistance and the current inside the output resistance and find the input resistance and the current inside the input resistance ... (more) |
— | 9 months ago |
| Comment | Post #286700 |
@LvW "the transfer function is defined for sinusoidal signals only!" why is that true?Why isnt the transfer function applied for a rectangular signal?Just s will be equal to something else instead of jω then. (more) |
— | 9 months ago |
| Comment | Post #286700 |
@a concerned citizen if s isnt any longer equal to jω maybe with the new input signal becomes 2jω the frequency at which we have a pole changes. (more) |
— | 9 months ago |
| Comment | Post #286700 |
For different input signals the frequency of the pole will have different values ,the pole as a pole exists for some specific values of L,C s but the frequency of the pole changes. (more) |
— | 9 months ago |
| Edit | Post #286698 | Initial revision | — | 9 months ago |
| Question | — |
Complex frequency of a pole If we have the transfer function of a LC high pass filter: $H(s) = \frac{sL}{sL+\frac{1}{sC}}$ If we want to find the pole of that filter in the end we get: $s = \frac{j}{\sqrt{LC}}$ and for a sinuisodal input signal $s = j\omega$ the pole exists at the resonant frequency $\omega{r}$ ... (more) |
— | 9 months ago |
| Comment | Post #286689 |
Isn't the gain inversely proportional to frequency from the rolloff frequency of a filter? Why "well past"? (more) |
— | 9 months ago |
| Edit | Post #286688 |
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— | 9 months ago |
| Edit | Post #286688 | Initial revision | — | 9 months ago |
| Question | — |
Effect of adding stages to a filter Suppose we have a RC low pass filter of 1st order. If we add multiple stages every time we add a RC stage identical to our original does the slope of the curve in the bode plot db/Hz becomes wilder but the cutoff frequency remain the same?And is there a formula if we know the slope of the curve a... (more) |
— | 9 months ago |
| Edit | Post #286679 |
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— | 9 months ago |
| Comment | Post #286687 |
In reality yes, but I am assuming that the slope db/Hz is constant.It is for educational purposes only. (more) |
— | 9 months ago |
| Comment | Post #286681 |
Olin I said "I have to design a low-pass filter" because I never thought we would end up at this place talking about why I am building this low-pass filter,I thought you would just help me with its design if you dont like it I can edit the question. (more) |
— | 9 months ago |
| Comment | Post #286680 |
Is the corner frequency equal to the cutoff frequency.And yes signals with frequency > cutoff frequency will be attenuated not completely go to 0. (more) |
— | 9 months ago |
| Edit | Post #286679 |
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— | 9 months ago |
| Edit | Post #286679 |
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— | 9 months ago |
| Edit | Post #286680 |
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— | 9 months ago |
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— | 9 months ago |
| Comment | Post #286681 |
I just picked the requirements in random , I dont have to design anything , I am doing it for fun but I dont know how to solve this problem. (more) |
— | 9 months ago |
| Comment | Post #286681 |
It isnt homework.I was just curious on the design of such a filter so here I am. (more) |
— | 9 months ago |
| Edit | Post #286680 | Initial revision | — | 9 months ago |
| Question | — |
Cutoff frequency of single phase transmission line Signals with frequency above the cutoff frequency of a transmission line cannot be transmitted through the transmission line. But how can I calculate the cutoff frequency of a single phase transmission line? I had been reading this/02%3ATransmissionLines/2.02%3ATransmissionLineTheory) page befo... (more) |
— | 9 months ago |
| Edit | Post #286679 |
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— | 9 months ago |
| Edit | Post #286679 | Initial revision | — | 9 months ago |
| Question | — |
How to design a low-pass filter when certain conditions must be met I am designing a low-pass filter with cut-off frequency = 100Hz and after the cutoff frequency from -3dB to -10dB the average decrease in db/Hz = -0.1 db/Hz.I know how to design a low-pass filter with cut-off frequency of 100Hz however I cannot meet the 2nd condition of the filter.How do I achieve s... (more) |
— | 9 months ago |
| Edit | Post #286537 |
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— | 10 months ago |
| Edit | Post #286537 | Initial revision | — | 10 months ago |
| Question | — |
Find Q point in common base BJT configuration Suppose we have this graph:  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 ... (more) |
— | 10 months ago |
| Edit | Post #286531 | Initial revision | — | 10 months ago |
| Question | — |
Re model of transistor is the same in 2 different configuration I was studying the Re model of a transistor:  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? (more) |
— | 10 months ago |
| Edit | Post #286090 | Initial revision | — | about 1 year 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... (more) |
— | about 1 year ago |
| Comment | Post #285683 |
I cant this is homework. (more) |
— | about 1 year ago |
| Edit | Post #285683 | Initial revision | — | about 1 year 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.  Our professor told us that it is more correct to draw the Current/Brightness graph than the Resistan... (more) |
— | about 1 year ago |
| Edit | Post #285325 |
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— | over 1 year ago |
| Comment | Post #285325 |
Star-Star and Delta-Delta topologies (more) |
— | over 1 year ago |
| Edit | Post #285325 | Initial revision | — | over 1 year 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? (more) |
— | over 1 year ago |
| Comment | Post #285242 |
Yes the question is theoretical I want to understand what bandwidth of the signal means. (more) |
— | over 1 year 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. (more) |
— | over 1 year ago |
| Edit | Post #285242 |
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— | over 1 year ago |
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— | over 1 year ago |
| Edit | Post #285242 | Initial revision | — | over 1 year ago |
| Question | — |
Bandwidth of serial signal Suppose we have this stream of data.Let's assume the data stream lasts 1 sec.  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 ... (more) |
— | over 1 year ago |
| Comment | Post #285171 |
Where should I ask it then? (more) |
— | over 1 year ago |
| Edit | Post #285170 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #285168 | Initial revision | — | over 1 year 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. (more) |
— | over 1 year ago |
| Edit | Post #285155 | Initial revision | — | over 1 year 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 .  Each layer of the ... (more) |
— | over 1 year ago |
| Edit | Post #284982 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #284865 | Initial revision | — | over 1 year 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? (more) |
— | over 1 year 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. (more) |
— | over 1 year ago |
| Edit | Post #284818 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Comment | Post #284253 |
Yes i am interested in the capacitance between the windings.How can we make it bigger? (more) |
— | over 1 year ago |
| Edit | Post #284562 | Initial revision | — | over 1 year ago |
| Question | — |
Capacitors of voltage regulators Assuming we have a voltage regulator :  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? (more) |
— | over 1 year ago |
| Edit | Post #284545 | Initial revision | — | over 1 year 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:  When switch is closed it enters its unstable state and it eventually returns to the stable state However Wikipedia states that thi... (more) |
— | over 1 year ago |
| Edit | Post #284514 |
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— | over 1 year ago |
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— | over 1 year ago |
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— | over 1 year ago |
| Comment | Post #284514 |
I will put some labels (more) |
— | over 1 year ago |
| Edit | Post #284514 | Initial revision | — | over 1 year ago |
| Question | — |
Find feedback of circuit I have this circuit:  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:  |
— | over 1 year 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. (more) |
— | over 1 year ago |
| Edit | Post #284253 |
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— | over 1 year ago |
| Edit | Post #284253 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #284219 |
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— | over 1 year ago |
| Comment | Post #284219 |
@Olin Done!It has been fixed (more) |
— | over 1 year ago |
| Edit | Post #284219 |
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— | over 1 year ago |
| Comment | Post #284219 |
@Olin i dont think it is possible in Multisim NOT to make any zig-zag . (more) |
— | over 1 year ago |
| Edit | Post #284219 | Initial revision | — | over 1 year 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  Can we instead have a pin which is connected directly to the base of Q1 and when that... (more) |
— | over 1 year ago |
| Edit | Post #284207 | Initial revision | — | over 1 year 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 (more) |
— | over 1 year ago |
| Edit | Post #284196 | Initial revision | — | over 1 year 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? (more) |
— | over 1 year ago |
| Comment | Post #284076 |
@Carl please clarify?Isnt it well written,correct or well presented? (more) |
— | over 1 year ago |
| Comment | Post #284076 |
Because it is useful if someone wants to ask something relevant to the question. (more) |
— | over 1 year ago |
| Edit | Post #284076 |
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| Edit | Post #284074 |
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— | over 1 year ago |
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| Comment | Post #284074 |
Yes oops I will edit the image. (more) |
— | over 1 year ago |
| Edit | Post #284074 |
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— | over 1 year ago |
| Edit | Post #284017 |
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— | over 1 year ago |
| Edit | Post #284076 |
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— | over 1 year ago |
| Edit | Post #284018 |
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— | over 1 year ago |
| Edit | Post #284076 | Initial revision | — | over 1 year ago |
| Answer | — |
A: Parallel RLC circuit It all depends on the values of the components:If  the system will very slowly decay until the energy of the system reaches 0. If  the system underg... (more) |
— | over 1 year ago |
| Edit | Post #284074 | Initial revision | — | over 1 year 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?  (more) |
— | over 1 year 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. (more) |
— | over 1 year ago |
| Edit | Post #284021 | Initial revision | — | over 1 year ago |
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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? (more) |
— | over 1 year ago |
| Edit | Post #284018 |
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— | over 1 year ago |
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— | over 1 year ago |
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— | over 1 year ago |
| Edit | Post #284018 | Initial revision | — | over 1 year ago |
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A: Series RLC circuit It all depends on the values of the components:If  the system will very slowly decay until the energy of the system reaches 0. If  the system und... (more) |
— | over 1 year ago |
| Edit | Post #284017 | Initial revision | — | over 1 year ago |
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Series RLC circuit How to find the equation of current of the RLC circuit after the switch is moved?  (more) |
— | over 1 year 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.
(more) |
— | over 1 year ago |
| Edit | Post #283958 |
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— | over 1 year ago |
| Comment | Post #283958 |
I mean how inductive coupling changes the total series inductance. (more) |
— | over 1 year ago |
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| Edit | Post #283960 | Initial revision | — | over 1 year 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:  Now current entering one coil marked with a dot, produces a ... (more) |
— | over 1 year ago |
| Edit | Post #283958 | Initial revision | — | over 1 year ago |
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Coupling of inductors Which will be the total series inductance?  (more) |
— | over 1 year ago |
| Comment | Post #283956 |
It isn't dimensionless im just doing the math. (more) |
— | over 1 year ago |
| Comment | Post #283956 |
I am using a LateX editor so I cant do what you want. (more) |
— | over 1 year ago |
| Comment | Post #283956 |
The (missing)units are obvious if you read the post. (more) |
— | over 1 year ago |
| Comment | Post #283956 |
I dont see any errors maybe you can enlighten me (more) |
— | over 1 year ago |
| Edit | Post #283927 |
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— | over 1 year ago |
| Edit | Post #283956 | Initial revision | — | over 1 year 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 ... (more) |
— | over 1 year ago |
| Edit | Post #283955 | Initial revision | — | over 1 year 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? (more) |
— | over 1 year ago |
| Comment | Post #283926 |
The circuit isnt wrong but what you have suggested is a improvement of the current source/switch relationship. (more) |
— | over 1 year 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 (more) |
— | over 1 year ago |
| Comment | Post #283936 |
Olin maybe you may want to delete this post. (more) |
— | over 1 year ago |
| Comment | Post #283926 |
What do you mean by designators exactly!? (more) |
— | over 1 year ago |
| Edit | Post #283927 |
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— | over 1 year ago |
| Edit | Post #283927 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #283926 | Initial revision | — | over 1 year 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? (more) |
— | over 1 year ago |
| Comment | Post #283904 |
Done check it out now. (more) |
— | over 1 year ago |
| Edit | Post #283904 |
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— | over 1 year ago |
| Comment | Post #283904 |
You are correct I will edit (more) |
— | over 1 year ago |
| Edit | Post #283904 |
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— | over 1 year ago |
| Edit | Post #283904 |
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— | over 1 year ago |
| Edit | Post #283904 | Initial revision | — | over 1 year ago |
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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... (more) |
— | over 1 year ago |
| Edit | Post #283903 | Initial revision | — | over 1 year 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? (more) |
— | over 1 year ago |
| Edit | Post #283896 |
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— | over 1 year ago |
| Edit | Post #283896 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #283585 | Initial revision | — | over 1 year ago |
| Question | — |
$Q$ and $\overline{Q}$ in bistable multivibrator In this bistable multivibrator which is $Q$ and which is $\overline{Q}$? (more) |
— | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #283436 |
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— | over 1 year 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. (more) |
— | over 1 year ago |
| Edit | Post #283436 | Initial revision | — | over 1 year 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?... (more) |
— | over 1 year ago |
| Edit | Post #283369 | Initial revision | — | over 1 year 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'?[]() (more) |
— | over 1 year ago |
| Comment | Post #283331 |
So a DC blocking capacitor to not allow any current flowing from the DC source to the AC source? (more) |
— | over 1 year ago |
| Edit | Post #283325 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #283249 | Initial revision | — | over 1 year ago |
| Answer | — |
A: 3+3 doesn’t show 6 The correct 1 bit full adder is this:hi (more) |
— | over 1 year ago |
| Edit | Post #283244 | Initial revision | — | over 1 year 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 (more) |
— | over 1 year 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? (more) |
— | over 1 year ago |
| Edit | Post #283206 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Comment | Post #283172 |
I cant understand which pins to connect with which pins. (more) |
— | over 1 year 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? (more) |
— | over 1 year 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. (more) |
— | over 1 year 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 (more) |
— | over 1 year ago |
| Edit | Post #283170 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #282738 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Edit | Post #282733 | Initial revision | — | over 1 year 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 (more) |
— | over 1 year ago |
| Edit | Post #282711 |
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— | over 1 year ago |
| Edit | Post #282711 | Initial revision | — | over 1 year 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 (more) |
— | over 1 year 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. (more) |
— | over 1 year ago |
| Edit | Post #282709 | Initial revision | — | over 1 year 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? (more) |
— | over 1 year ago |
| Edit | Post #282690 |
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— | over 1 year ago |
| Edit | Post #282690 |
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— | over 1 year ago |
| Edit | Post #282690 | Initial revision | — | over 1 year 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 (... (more) |
— | over 1 year ago |
| Comment | Post #282672 |
Yeah for you it may be easy I have tried learning MathJax and couldn't (more) |
— | over 1 year ago |
| Edit | Post #282671 |
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— | over 1 year 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. (more) |
— | over 1 year ago |
| Edit | Post #282671 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Comment | Post #282635 |
Thanks I understand now/ (more) |
— | over 1 year 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. (more) |
— | over 1 year ago |
| Comment | Post #282635 |
I still dont get it VL=-VC = -2V. (more) |
— | over 1 year ago |
| Comment | Post #282627 |
But the opamp can correctly function without the capacitor,correct? (more) |
— | over 1 year ago |
| Edit | Post #282624 | Initial revision | — | over 1 year 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? (more) |
— | over 1 year ago |
| Comment | Post #282585 |
Ok it is ready for reopening (more) |
— | over 1 year ago |
| Edit | Post #282585 |
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— | over 1 year ago |
| Edit | Post #282585 |
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— | over 1 year ago |
| Edit | Post #282585 | Initial revision | — | over 1 year 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... (more) |
— | over 1 year ago |
| Comment | Post #282434 |
How are the equations derived?I didnt get it. (more) |
— | almost 2 years ago |
| Comment | Post #282363 |
Yes and Vout cant become less than Vin-.How can we fix this? (more) |
— | almost 2 years 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? (more) |
— | almost 2 years ago |
| Edit | Post #282361 | Initial revision | — | almost 2 years 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... (more) |
— | almost 2 years ago |
| Edit | Post #282262 | Initial revision | — | almost 2 years 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... (more) |
— | almost 2 years ago |
| Edit | Post #282180 | Initial revision | — | almost 2 years 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... (more) |
— | almost 2 years ago |