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Q&A derating MLCC ripple current for transient current spikes

how much higher can i go in current ripple RMS None, of course, at least if you want to rely on anything else the datasheet says. The heating is a function of the RMS current. No, you don't get ...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A derating MLCC ripple current for transient current spikes

This graph - MLCC temperature rise vs ripple current RMS & frequency If I had a 10 us current spike every 100 000 us (akin to a half-sine wave and then the rest of 9999 sine waves missing), ...

2 answers  ·  posted 1y ago by kellogs‭  ·  last activity 1y ago by TonyStewart‭

Question frequency ripple temperature ceramic-capacitors
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Q&A Cable voltage rating

First question I have is why conductor/earth voltage rating for DC is specified lower at 0.9kV? Imagine two cables running side to side. To get from one cable to the other, an electron would h...

posted 1y ago by Sclrx‭  ·  edited 1y ago by Sclrx‭

Answer
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Q&A ATX Computer Power Supply Spark in Non-computer Application

Do you supply the PSON# signal before or after the main power comes on, or before connecting the load? Looking at the datasheets, the correct sequence is VAC power on, then PSON# signal to ground,...

posted 1y ago by DSI‭

Answer
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Q&A Disabling breakpoints in real-time section of firmware

Does C have a mechanism which lets me mark a section of code such that breakpoints are somehow ignored or not allowed just in that section? Generally compilers are completely unaware of debugg...

posted 1y ago by Gnomo‭  ·  edited 1y ago by Gnomo‭

Answer
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Q&A What is Ground Electrode in EMG?

When measuring signals at different points on the skin of the body, you don't usually want to connect the victim patient to ground. Usually you use an extra electrode connected some distance away ...

posted 1y ago by Olin Lathrop‭

Answer
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Meta How to deal with design review questions?

I agree with this approach. Categories should only be created when they are expected to have reasonable traffic. A category with only chirping crickets is an anti-advertisement. Take a look at t...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A What is Ground Electrode in EMG?

CMRR design is key to rejecting grid e-fields that impose noise onto EMG, EKG,EEG amplifiers. This includes all series Zs of cable balance and Amp CMRR. For this reason >100 dB CMRR are requ...

posted 1y ago by TonyStewart‭  ·  edited 1y ago by TonyStewart‭

Answer
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Q&A Essential safety features of an EMG/medical grade device?

Current limiting input differential Rs of 1M into a 10M INA with clamp diodes make this a simple task.

posted 1y ago by TonyStewart‭

Answer
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Q&A Can the corner frequency of thermal noise change with change in source impedance?

Any time you have a dielectric interface ( ___ pF ) source resistance will always have an error in signal response until the electrode impedance is eqal or less than the sub-cutaneous impedance. T...

posted 1y ago by TonyStewart‭  ·  edited 1y ago by TonyStewart‭

Answer
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Q&A Can the corner frequency of thermal noise change with change in source impedance?

The thermal noise of a resistance depends only on that resistance. However, there is always some parasitic capacitance. That capacitance against the resistance causes a low pass filter. So in a ...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A Can the corner frequency of thermal noise change with change in source impedance?

In EMG there is a certain level of thermal noise created at the electrode-gel-skin interface which depends on the skin-electrode impedance (also known as source impedance). I have been able get th...

2 answers  ·  posted 1y ago by tilly‭  ·  last activity 1y ago by TonyStewart‭

Question opamp
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Q&A Synchronization of clock of satelite with devices here on the Earth

First, the time dilation experienced by a satellite is tiny on a human scale. It takes sophisticated algorithms and lots of processing power to measure time differences between a spot on earth and...

posted 2y ago by Olin Lathrop‭

Answer
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Q&A Contradiction between Routh's algorithm and checking with some value

I am designing a control system controlled by some microcontroller K: The open loop gain is $G_{o}(s) = \frac{K}{s(s^{2}+4s+3)}$ and the closed loop gain is obviously $G_{c}(s) = \frac{K}{s(s^{...

0 answers  ·  posted 2y ago by Volpina‭

Question microcontroller control automatic-gain-control
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Q&A What is dynamic resistance? Is it related to differential resistance or to incremental resistance?

Introduction Yes, all those terms denote the same concept, that of differential (or incremental, or dynamic) parameter of a device. In the following I will explain such a concept initially in the...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

Answer
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Q&A What effect will extreme temperatures have on characteristic impedance of a wire?

RG58 cables come in different variations, even with Teflon dielectric suitable for 200°C operations. Your cable, being suitable for up to 80°C, seems to be one of those with a PVC jacket and Polyet...

posted 1y ago by Lorenzo Donati‭

Answer
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Q&A Low-pass filter after the output DAC in CD players

One of the main reasons was hinted by Olin's answer, at the end, when he spoke about non-linearities. The same is hinted in the excerpt in Nick Alexeev's answer ("they would overload the player amp...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

Answer
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Q&A Why is the resistance of water so high and still so dangerous?

Most of the issues have been discussed by other answers. However I would like to clarify something about pure water (a.k.a. "distilled water" or "demineralized water"), which is "apparently" not a ...

posted 1y ago by Lorenzo Donati‭

Answer
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Q&A How is it possible to perform a open circuit test on a induction motor?

To truly "open circuit test" a motor as I interpret it, remove it from power, and measure the following: Using an Ohmmeter, measure each winding resistance. Start from W1 to W2. This will be...

posted 2y ago by rdtsc‭

Answer
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Meta Is English translation of technical terms on-topic?

I think we should definitely allow technical terms translations, because it's really difficult to find reliable sources online. And the translation process can be tricky, since the translated term ...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

Answer
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Meta Creating a FAQ: how to read a datasheet

I agree with Olin and Mu3 answers. I'll add that you should aim not for just one kind of "high level" component, but many more basic ones. Not every EE course is the same across the world, and man...

posted 1y ago by Lorenzo Donati‭

Answer
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Q&A How to convert dv/dt of noise into frequency for filter capacitor selection?

Noise can be coupled between signal lines through parasitic capacitance formed between these signal lines, as $i = C\frac{dv}{dt}$ where C is the capacitance between the signal lines. Another wa...

1 answer  ·  posted 2y ago by Elleanor Lopez‭  ·  last activity 2y ago by Olin Lathrop‭

Question capacitor filter
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Q&A Are a JFET's Idss and Vgs(off) values correlated?

I know that many JFETs parameters have a very large manufacturing spread, in particular, $I_{DSS}$ and $V_{GS(off)}$, as one can see (for example) in this datasheet excerpt: ... My question i...

1 answer  ·  posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Nick Alexeev‭

Question datasheet JFET manufacturing
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Q&A Are a JFET's Idss and Vgs(off) values correlated?

I'll let someone else answer about the device physics. I'll answer from an electrical engineering standpoint. The answer is: Maybe, but it doesn't matter since you should be considering worst cas...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A Is ESD overhyped?

Many ESD problems are "latent" that is they do not sofort show up....some time later things will stop working :)

posted 1y ago by dekker‭

Answer