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Answer by periblepsis for 7-segment numeric counter that only displays...
A push-button is a notorious source of glitches as it settles one way or another. So it will need debouncing. Ben Eater's 8-bit computer uses a 555 for this purpose (also available in CMOS...
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Answer by periblepsis for Transistor circuit
What you have is essentially this:simulate this circuit– Schematic created using CircuitLabIf we assume about \$700\:\text{mV}\$ for the \$V_{_\text{BE}}\$ junction of the NPN, tentatively, and...
View ArticleComment by periblepsis on Calculating voltage drop
@TIMDRIPCAN If you mean over on the left side then it's just a simple resistor divider that can be converted from three parts (ideal voltage source, plus two resistors) to just two parts -- a new ideal...
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Answer by periblepsis for Current limiting circuit behaves not as expected
That's not a very good circuit.From a very simplistic view, you can consider the bipolar's \$V_{_\text{BE}}\approx 700\:\text{mV}\$, that bypasses both diodes. This means that from a first order...
View ArticleComment by periblepsis on What happens to the capacitor and inductor if net...
@M.SaaminRahman If I'm reading you well, then yes. That's a good way to put it. The idea of reactive power is for the equilibrium state, which is arrived at after some time passes. The fuller equations...
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Answer by periblepsis for Use of Inductors in Low Pass Filter
I am wondering if there can be other variations to achieve this secondorder low pass filter.Sallen & Key discussed a large catalog of 2nd order active networks in their 1955 paper. Not just the one...
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Answer by periblepsis for KVL Method - Currents Signs on the equation
There are rules, such as the passive sign convention, and there are other rules (which shall remain unnamed as I don't like them.)So long as you use logically consistent rules and apply them...
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Answer by periblepsis for Understanding Gas Sensor Output Voltage from...
your questionIt's almost impossible to guess at your professor's motivations for remaining somewhat opaque in conversations with you. If I had to throw mud at the wall as a guess, I'd say that you are...
View ArticleAnswer by periblepsis for How many volts is the potential \$V_x\$ when only...
I get:$$\begin{align*}0\:\text{V}+V_1 - R_1\cdot I_1 - R_4\cdot\left(I_1-I_2\right)&=0\:\text{V}\tag{mesh 1}\\\\0\:\text{V}- R_4\cdot\left(I_2-I_1\right)-R_2\cdot...
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Answer by periblepsis for Designing a Sallen-Key Band Pass Filter
Let me expand your diagram:simulate this circuit– Schematic created using CircuitLabI don't know if this is what your notes used. But it's what came to mind when reading the equations you provided. If...
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Answer by periblepsis for Mesh analysis method
Your question could have been better with a little extra time added to improve its readability. But I may have the gist of it.I'll call your loop currents \$J_1\dots J_4\$ and accept your use of \$I\$...
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Answer by periblepsis for How to identify the terminology of Common Amplifiers?
I went through a similar process of trying to understand books teaching these same three configurations.(Also, at that time, I didn't know about single-ended vs differential modes for signalling. The...
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Answer by periblepsis for Common-Emitter Darlington Circuit – Theoretical...
you can't get there from hereWith your amplifier topology, the open loop voltage gain is approximately the quiescent voltage across the collector resistor divided by the quiescent voltage across the...
View ArticleAnswer by periblepsis for Forward voltage of the 1N4001 diode is not 0.7 V
Any forward bias with a diode, even a very small applied voltage, will lead to some diode current.Taking a look at your data table, it appears to me that your measurements with smaller applied voltages...
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Answer by periblepsis for Find maximum and minimum between 2 and 3 Numbers
The obvious suggestion will be something like this:In this case, it's a comparator that outputs a 1(true) if \$A\lt B\$. That can be used to gate the appropriate input to an output via a mux.Staging...
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Answer by periblepsis for How to solve BJT circuit with negative V_CE?
Your question brings up the entire Ebers-Moll model and correctly points out that both forward and reverse \$\beta\$ values would be needed.I discuss the saturation case in detail here, with respect to...
View ArticleAnswer by periblepsis for Thevenin equivalent
For example, perhaps follow this procedure:Set b as your ground reference. This makes b a known value.For those circuit branches where multiple parts in series with each other can just be added...
View ArticleAnswer by periblepsis for Collector Current of BJT
If you assume, as you say, that \$\beta\to\infty\$ and the base current can be completely ignored then you can just solve for the emitter voltage directly:\$V_{_\text{E}}\$ is...
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Answer by periblepsis for How to find the equivalent resistance of this circuit
Sounds like you already have all you need for your answer. That's great! But I thought I'd add something: always redraw your schematics using these Rules for Re-Drawing Schematics.Drawing from that...
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Answer by periblepsis for Question regarding Oscillation in Opamp circuit
I believe I can independently replicate your analysis using freely available SymPy:z3 = par( R, 1/s/C ) # last dividerz2 = par( z3 + R, 1/s/C ) # middle dividerz1 = par( z2 + R, 1/s/C ) # first...
View ArticleAnswer by periblepsis for Voltage Division and Nodal Analysis
Assuming you mean dissipative real power as a power transfer to this load, then you want the complex conjugate of the Thevenin source impedance per the maximum power theorem in Wikipedia.Label the node...
View ArticleComment by periblepsis on Thevenin voltage and resistance calculation for...
@AAria Best wishes then. And thanks for letting me know it helped. Appreciated.
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Answer by periblepsis for Kirchoffs voltage law with 3 voltage sources
I'll use your original diagram, but add names to the voltage sources and pick a specific direction for the current requested in part (a):They didn't specify the direction, so that means you get to pick...
View ArticleAnswer by periblepsis for Micro-Cap - What is the procedure to add .SUBCKTs?
I don't use MicroCap and have never used it. So I can't help, directly. But after half a day I still don't see an experienced answer, so I'll write a few things that may (or may not) help you help...
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Answer by periblepsis for Why does simple embedded scheduler timing drift...
just a comment -- you need to say and write moreYou haven't been very interactive here. And there are some questions outstanding. In particular, showing the assembly code output for the two cases which...
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Answer by periblepsis for How to find current in this RL circuit?
I could easily solve for Ix and I in the inductor.I then assume you know that at \$t=0^-\$ the voltage across the inductor is \$0\:\text{V}\$ and...
View ArticleComment by periblepsis on Confusion with the max LC circuit impedance in LTspice
@PhiPhox I'd already tried that to no effect. That doesn't mean it can't have an impact. Perhaps if I could position a sample point well enough, then it might make a huge difference! I'll add that note...
View ArticleComment by periblepsis on Compatible replacement for Hardkernel Odroid N2...
Kind of looks like Molex: 1 and 2? I don't expect it to be Molex -- the lettering there suggests otherwise. But close?
View ArticleComment by periblepsis on VGA on Breadboard
I'd recommend spending some time looking over the hardware (and software) for the Maximite(monochrome first, then the color edition) computer. The author is quite detailed. The first version uses a...
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Answer by periblepsis for LT spice this subcircuit is not defined error
You will want to find and install Alexej Bordodynov's ZZZ library files.I'm actually a little surprised that you are getting an error because that's where your symbol comes from. I don't know you got...
View ArticleComment by periblepsis on What approach is better for the required power for...
@Recurseed I'd prefer a motorcycle battery myself. I don't like parallel systems as well. Just an opinion. I'll leave this to others willing to ask more questions.
View ArticleComment by periblepsis on Is loop gain supposed to be 1 according to...
@kile LvW is correct. You need to work out the transfer function and examine the denominator, setting the imaginary part to zero and solving to find omega. Then plug that in to find the attenuation....
View ArticleComment by periblepsis on Convergence of common-emitter amplifier non-linear...
What are your goals? I get it that you are having trouble with the spreadsheet. But what exactly is to be achieved by creating a spreadsheet? I'm not asking why you want to avoid a simulator -- I...
View ArticleAnswer by periblepsis for Issue with seven segment display
I'm going to take it as granted that you need to cause your ID to be sequentially displayed, one at a time, on a single 7-segment display -- perhaps manually clocked or else perhaps clocked at some...
View ArticleComment by periblepsis on Why the V_BE is too high in this circuit?
@KavinIshwaran Aaron's point about the ground reference still applies. There's a problem (or else you need to provide a very long explanation.)
View ArticleComment by periblepsis on Toroidal inductors and transformers
Rémy, Currents occur because of surface charge gradients on the wire. The static view (DC) is what you show. And there will be an electric field in the direction shown. Anything applied to disturb...
View ArticleComment by periblepsis on How to Split +12V and Ground into Multiple...
@jonathanjo power distribution board and electronic speed control.
View ArticleComment by periblepsis on PCA9540 for voltage level translation
@HasanTheSyrian_ You should supply the IC with the lowest voltage based upon the maximum line in the chart. If any of your I2C cannot tolerate more than 1.8 V then you want to supply no more than about...
View ArticleComment by periblepsis on Butterworth filter at ADC input
Depending on your needs, you may want a chopper. There's a lot of 1/f noise when you get close to DC and it's better to move away from that area. Drift can be a real problem. Also, your sample rate may...
View ArticleAnswer by periblepsis for Gain at crossover frequency not equals to 0 dB
Given those two resistors, I'm surprised you think 0 dB. But I'm not going to find mistakes in your work. I'm also not going to criticize the circuit. I'll just accept it as shown, develop the...
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