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1.2k posts
 
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+3 −0
Q&A Is ESD overhyped?

Just to let you know: if one day you have to use the LM337 negative voltage regulator, protect everything with TVS or Zeners. This is the most failing component I've ever seen (and I'm not the only...

posted 4y ago by coquelicot‭  ·  edited 4y ago by coquelicot‭

Answer
71%
+3 −0
Q&A LED with a parallel resistor

You haven't provided any context, so there is little to say about this particular design. For all we know from what you told us, this could be homework from a student that just made a mistake. How...

posted 4y ago by Olin Lathrop‭  ·  edited 4y ago by Olin Lathrop‭

Answer
71%
+3 −0
Q&A Is there a mathematical process resembling the terms "digital"/"discrete" and "analog"/"continuous"?

I always had trouble understanding the terms "digital" and "analog" A digital signal is intended to indicate one of a finite set of discrete states. The number of discrete states is usually two fo...

posted 4y ago by Olin Lathrop‭  ·  edited 4y ago by Olin Lathrop‭

Answer
71%
+3 −0
Q&A Limiting current to DC brushed motor

I don't think there is a simple way to inherently limit the current to 10 A. The best approach seems to me to add a low side current sensor between the bottom of the H bridge and ground. The main...

posted 2y ago by Olin Lathrop‭

Answer
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Q&A Unexpected impedance spike when paralleling capacitors

Around the 19 min mark in the video (approximately, found with hovering the cursor over the timeline) you'll see that different capacitors have different values of both capacitances and parasitics,...

posted 2y ago by a concerned citizen‭

Answer
71%
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Q&A Thévenins Theorem for Transistor Circuit

I am calculating the base current of transistor Q1. To simplify the circuit equations, I applied the Thévenin's theorem twice and converted V1, R1 and R2 into Vth and Rth, as shown in the image. ...

2 answers  ·  posted 2y ago by kadamrohan16‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta Wish to have comment votes

I see that Monica answered your question directly. However, there is another point to keep in mind. Comments are not for content. That was supposedly the case at SE too, but was poorly enforced....

posted 2y ago by Olin Lathrop‭

Answer
71%
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Q&A Siglent1104 oscilloscope channels lagging

If all four channels are really connected to the same signal in the pictures you show, then there is indeed some skew between pairs of channels. Try swapping probes to see if the lag goes with the...

posted 2y ago by Olin Lathrop‭

Answer
71%
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Q&A H-Bridge components and calculations

My goal is to make an RC car, and I have a couple of questions regarding driving the brushed DC motor. Schematic for half of my H-bridge looks like this for now (it will be identical on the other s...

1 answer  ·  posted 2y ago by Stefan‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&A Case temperature of MOSFET

Yes, you seem to understand the concept. From the case to the ambient air, there will be 1.3°C per watt across the pad, and another 2.0°C per watt across the heatsink. In total, there will be 3.3...

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

Answer
71%
+3 −0
Meta Wish to have comment votes

Every time I visit Codicact I miss the comment voting feature. There is no way to know if some comment is rubbish or a gem because the opinions of others are hidden from future visitors. I wish t...

2 answers  ·  posted 2y ago by KalleMP‭  ·  last activity 2y ago by Olin Lathrop‭

Question feature-request
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Q&A How do PLCs normally measure 4-20mA current loops?

You should not be relying on the internal circuitry of whatever senses the 4-20 mA current. Note that the two implementations you show both use current sense resistors. The only difference is the...

posted 2y ago by Olin Lathrop‭  ·  edited 2y ago by Olin Lathrop‭

Answer
71%
+3 −0
Q&A Case temperature of MOSFET

Homework problem A MOSFET has a power dissipation of $P_{d} = 10\text{W}$. The MOSFET is mounted on a heatsink. There is an isolation pad between the MOSFET case and the heatsink. We are given t...

1 answer  ·  posted 3y ago by Carl‭  ·  edited 1y ago by Lorenzo Donati‭

71%
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Meta Code formatting appears to be broken

I posted a post containing C code in the Papers category here, using the ```c formatting which works elsewhere on Codidact. The code does not get formatted with color coding, though it gets fixed ...

1 answer  ·  posted 3y ago by Lundin‭  ·  edited 2y ago by Lundin‭

71%
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Meta Code formatting appears to be broken

Code highlighting, like Mathjax, incurs a small penalty on page rendering, so we don't turn it on by default. The question hadn't come up before on EE, so it was off. I've just turned it on.

posted 3y ago by Monica Cellio‭

Answer
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Q&A Oscilloscope potentially ESD striked

The usual culprits would rather be the ground clip itself or accidentally shorting something with it, more so than ESD. And if something has actually broken on the scope, I'd suspect the probe to b...

posted 2y ago by Lundin‭  ·  edited 2y ago by Lundin‭

Answer
71%
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Meta React feature guidelines?

Summary "Outdated" should be used for "this won't work anymore today", not "we would do this differently today". Detail "Outdated" should be reserved for when an answer is wrong or misleading be...

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

Answer
71%
+3 −0
Q&A Flyback converter design

Hi guys,I'm designing a multiple output flyback converter with 2 outputs at 10v@1 Amp and 5v @ 2 Amps .Input is 20 V dc Im having some problem with the implementation of closed loop. Open loop res...

2 answers  ·  posted 3y ago by Sriram14‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta Do we need tags for supply voltages?

Someone just created the tags 208VAC and 230VAC. If think we need to create a policy about tag usage related to supply voltages. Clearly, stating the supply voltage is highly relevant information ...

2 answers  ·  posted 3y ago by Lundin‭  ·  last activity 3y ago by Olin Lathrop‭

Question discussion tags
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Q&A What is minimum resolution here?

On page 26 and 27 of that manual, it lists accuracy and resolution separately. The accuracy is how far away you should expect the measured value to be from the actual value. The resolution is the...

posted 3y ago by dsr‭

Answer
71%
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Q&A Asynchronous connection question

Assuming you speak of UART, then the receiver must be told in advance the number of data bits, the number of parity bits and the number of stop bits. The start bit is a logic zero (low) and the sto...

posted 3y ago by Lundin‭  ·  edited 3y ago by Canina‭

Answer
71%
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Q&A Resistance of digital ampmeter

You might get lucky and be able to measure the input resistance using this method. It should work because the black socket (common) is shared by all measurements.

posted 3y ago by Andy aka‭

Answer
71%
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Q&A Low-frequency PWM-controlled Mosfet heater circuit

This answer is regarding the resonance issue that C2 is fixing, and how it could be done with a smaller cap. There are two aspects of it. To start, consider the 5.6uH vs the 10uF capacitors. It ca...

posted 3y ago by Pete W‭  ·  edited 3y ago by Pete W‭

Answer
71%
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Meta React feature guidelines?

Example of answers that should be classified as Dangerous: "Do it yourself" Q&A where someone is fiddling around with 230VAC electronics or other such potentially lethal power sources withou...

posted 3y ago by Lundin‭

Answer
71%
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Q&A What is the difference between rise/fall time and Turn-On/off Delay Time?

In general, the on/off delay is how long it takes from changing the input until the output starts to do something. The rise/fall time is how long it takes to do the something, once it starts doing...

posted 2y ago by Olin Lathrop‭

Answer