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1.2k posts
 
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Q&A Critically damped oscillation issue

I don't know how to attach images to a comment thread, so I will just open up an answer for this. I redrew the schematic for you to reference. I think that symbol at the top of your drawing prob...

posted 3y ago by cosined‭  ·  edited 3y ago by cosined‭

Answer
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+4 −2
Q&A Voltage of tank circuit is invalid

You need to be more careful. First, you should have been able to see for yourself that the first equation isn't written right. I'll assume the whole "-0.5t" is the exponent of e. You were too sl...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

Answer
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+1 −0
Q&A Diodes used in mixers

Take a look at the circuit and try to see what function it will perform on the input signals to yield the output signal. For simplicity, let's consider the diode ideal, R1 and R2 the same, and R3 ...

posted 3y ago by Olin Lathrop‭

Answer
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+1 −0
Q&A Contactor control - Higher voltage PWM

While your basic idea seems fine, I will not enter into this matter, especially after Olin has said he will. Instead, I will give some other ways to do that, that may be useful in other circumstan...

posted 3y ago by coquelicot‭  ·  edited 3y ago by coquelicot‭

Answer
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+1 −0
Q&A Trouble understanding how to use adjustable LDO regulator

I just happened to re-read this question, and I now think I see better what Microchip was trying to say here: On closer examination, I think this is actually correct but badly worded. I believe...

posted 3y ago by Olin Lathrop‭

Answer
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Q&A 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 ...

1 answer  ·  posted 3y ago by MissMulan‭  ·  last activity 3y ago by Andy aka‭

Question voltage AC DC
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Q&A Unexpected phase shift in results

I find the current flowing through the capacitor $$\begin{align} I_{C_1}(t)&=\dfrac{\mathrm{d}}{\mathrm{d}t}\left[V_1(t)-I_{C_1}(t)R_1\right] \\ {}&= \dfrac{\mathrm{d}}{\mathrm{d}t}\left...

2 answers  ·  posted 3y ago by MissMulan‭  ·  last activity 3y ago by coquelicot‭

Question voltage current AC
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Q&A Max V/Hz value for motor

Here is a copy of your specs to make them easier to discuss here: None of those specs really tell you what the V/Hz of the generator inside that motor is. We could take a reasonable guess at if...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

Answer
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+1 −0
Q&A Meaning of some components around voltage reference in SMPS

At first glance, R22, C22, and C23 look like a compensation network around the TL431. However, this doesn't make much sense because the TL431 is being run open loop. Rfbt and Rfbb divide down the...

posted 3y ago by Olin Lathrop‭

Answer
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Q&A Design considerations for a synchronous DC/DC converter

First, let's clarify something: replacing a diode with a MOSFET switch I have never seen the diode actually replaced. The intent is to have the FET on only when the diode would conduct, but no s...

posted 3y ago by Olin Lathrop‭

Answer
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Q&A Estimating the input capacitance of an BLDC motor controller

Problem Description I am trying to design a BLDC inverter and I am in doubt of what would be the right approach for estimating the input capacitor size/type. Doing it empirically or throwing every...

2 answers  ·  posted 3y ago by 2kind‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&A Is there a way to reliably measure antenna return loss outside a lab?

It sounds like you are doing the measurements right. However, I expect the problem is in the space around the antenna. At 434 MHz, the wavelength is 690 mm or 27 inches. Everything out to about ...

posted 3y ago by Olin Lathrop‭

Answer
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Q&A Why are antenna PCB traces square instead of rounded?

Corners and chambers that are a small fraction of a wavelength are not significant in the <4Ghz band. More significant is the tolerance and loss tangent on the substrate. They would hardly be m...

posted 3y ago by TonyStewart‭  ·  edited 3y ago by TonyStewart‭

Answer
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Q&A Estimating the input capacitance of an BLDC motor controller

To answer some of your questions: Cable inductance: approx 1uH/m +/-50% depends slightly on l/d ratio , while cable impedance from sqrt(L/C) depends on twists/ft 50pF/m while coax is ~100pF/m ...

posted 3y ago by TonyStewart‭  ·  edited 3y ago by TonyStewart‭

Answer
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Q&A 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?

1 answer  ·  posted 3y ago by MissMulan‭  ·  last activity 3y ago by MissMulan‭

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Meta React feature guidelines?

I think "dangerous" is pretty clear. It's when doing as recommended can cause significant damage to property or health. For example, recommending to a hobbyist to make a direct line-connected cap...

posted 3y ago by Olin Lathrop‭

Answer
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Q&A Division of binary numbers logic circuit

I dont understand how to make a logic circuit which does that job:check if the divisors is greater and equal or less than the most left digits of the divident So think about it. Break it down int...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

Answer
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Q&A Division of binary numbers logic circuit

You're thinking of a digital comparator, "a hardware electronic device that takes two numbers as input in binary form and determines whether one number is greater than, less than or equal to the ot...

posted 3y ago by JRN‭

Answer
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Q&A 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 >...

2 answers  ·  posted 3y ago by MissMulan‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&A Change of pins in monostable multivibrator

The circuit you show doesn't make any sense: Start by examining the steady state condition. In steady state, C1 is effectively an open, so you ignore it. R4 keeps Q1 on. That means the collec...

posted 3y ago by Olin Lathrop‭

Answer
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Q&A Change of pins in monostable multivibrator

Your circuit will make sense if you do two things: significantly increase both R3 and R4 reverse D1 or move it to Q1's base Let's first see the role of the resistances R3 and R4. These are ...

posted 3y ago by Circuit fantasist‭  ·  edited 3y ago by Circuit fantasist‭

Answer
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Q&A Is there a mathematical process resembling the terms "digital"/"discrete" and "analog"/"continuous"?

Is there a mathematical process resembling the terms "digital"/"discrete" and "analog"/"continuous"? Rounding (down, or up, or to the nearest integer) is he mathematical process which discreti...

posted 3y ago by Nick Alexeev‭  ·  edited 3y ago by Nick Alexeev‭

Answer
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Q&A PTC resettable fuse leakage current

That's a marketing blurb. Look at the real datasheet. I just checked a polyfuse datasheet, and see that there is usually only about a 2.5 to 3.0 ratio of trip current to hold current. That shoul...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

Answer
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Q&A Most correct term for radio switching noise?

I don't think there is a formal term that means exactly what you describe. Switching transients generally means short term glitches that might cause noise, usually resulting from power being switc...

posted 3y ago by Olin Lathrop‭  ·  edited 3y ago by Olin Lathrop‭

Answer
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Q&A Adding resistance to varactor circuit

in my schematic we must add R1 correct? Yes that works except: - One last question if we deliver voltage to a house are there varactors which can handle 120V AC No, they don't exist.

posted 3y ago by Andy aka‭

Answer