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Activity for Nick Alexeev‭

Type On... Excerpt Status Date
Comment Post #292918 Could you convert this post into an update (an edit) to your question, instead of posting it as an answer, please? It's good information. (Then I'll update my answer.)
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8 days ago
Edit Post #292909 Post edited:
9 days ago
Edit Post #292909 Post edited:
9 days ago
Edit Post #292898 Post edited:
9 days ago
Edit Post #292909 Initial revision 9 days ago
Answer A: OPA2211 datasheet error
The 1st page of a datasheet is written by marketing. It can still give you an idea of what the chip is about, but it often contains the performance data under the best conditions. The conditions are rarely specified on the 1st page. Always check the electrical characteristics section and the cha...
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9 days ago
Edit Post #292872 Post edited:
new tags added
14 days ago
Comment Post #292527 @#56656 Are you certain that you have pollution level 1, and not 2 ? Pollution level 1 is a sealed enclosure. Pollution level 2 is a PCB in a vented enclosure under room conditions (say a motherboard in a desktop PC). Pollution level 2 is the default when you have neither aggravating factors nor ...
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about 2 months ago
Comment Post #292525 I doubt that these connectors are intended for scenarios where center conductor and shied are on opposite sides of basic insulation. Just like there's no IEC basic insulation in the USB or HDMI jack. What kinds of signals are you going to run through these coaxes? If you'd like further analysis on...
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about 2 months ago
Edit Post #292378 Question closed 2 months ago
Comment Post #292295 Welcome to EE.Codidact . Out of curiosity, which book is this circuit from?
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3 months ago
Edit Post #292295 Post edited:
3 months ago
Comment Post #292235 Let's look at your situation more broadly. Are you making a one-off for your own home use? Or it this going to be a production run? Or something more exotic?
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3 months ago
Comment Post #292235 I'd say that the laptop was certified as a system: its case, antenna, and all. If you replace the antenna with something that's not an official replacement part or an accessory released by the maker of the laptop, that would void the certification. It's possible to take FCC certified parts and some...
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3 months ago
Comment Post #292235 You're going to void the FCC certification which the original laptop had.
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3 months ago
Edit Post #292133 Initial revision 3 months ago
Answer A: Purpose of resistance between SENSE/FORCE line of power supply
> Furthermore, an amplifier symbol called "gm" is labeled as transconductor. What does it do? Transconductors are voltage-controlled current sources, but what are they doing here? The diagram looks like a voltage output power supply. I'll make a working assumption that it's voltage output power s...
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3 months ago
Comment Post #292131 Could you edit your post, and add a link to the manual (or the datasheet, or the product page), please?
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3 months ago
Comment Post #292080 Are you designing the entire system? Or are you plugging into an existing system? A lot of systems have a periodic "heartbeat" message on the CAN bus. When your PIC sees the message then it knows it's connected to CAN.
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4 months ago
Edit Post #292007 Post edited:
4 months ago
Edit Post #292007 Post edited:
4 months ago
Edit Post #292007 Initial revision 4 months ago
Answer A: STM32. What should be done in firmware for VBUS detection through a GPIO pin?
I've found a solution, and tested it. What @Olin wrote earlier holds. This is to post my code for STM32. > Does the VBUS detection have to be done in an interrupt? I've asked the ST's technical support, and they replied that it should be done in the interrupt. Here's my ISR code. / ...
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4 months ago
Comment Post #291971 Already a useful article. - You could mention that some MCUs have pins which modify how the MCU received the firmware from the ICD and runs it. -- STM32 have bootloader enable pins BOOT0 and BOOT1. Their behavior and default state varies slightly from sub-family to sub-family (it's described i...
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4 months ago
Edit Post #291935 Post edited:
4 months ago
Edit Post #291935 Post edited:
4 months ago
Edit Post #291935 Post edited:
4 months ago
Edit Post #291935 Post edited:
4 months ago
Edit Post #291935 Initial revision 4 months ago
Answer A: Are LDOs more efficient than switching regulators in very low currents?
The efficiency of the LDO is a function of the input and output voltages. $$\eta = \frac {P{out}} {P{in}} = \frac {I{out} V{out}} {I{in} V{in}}$$ $I{out} \approx I{in}$ for a series linear regulator ¹ ². Input and output currents cancel. $$\eta \approx \frac {V{out}} {V{in}}$$ In your ...
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4 months ago
Edit Post #291838 Post edited:
5 months ago
Comment Post #291833 @#53469 Nice app note. It's the answer to the question.
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5 months ago
Edit Post #291838 Initial revision 5 months ago
Answer A: Using only ceramic capacitors on an input of an SMPS - unclear advice from manufacturer
The electrolytic capacitor acts as a snubber in parallel with the ceramic capacitors. If one were to design an RC snubber to dampen the LC circuit, it would have a large capacitance (compared to the ceramic), and some series resistance. An electrolytic capacitor with some ESR is a cheap way to get ...
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5 months ago
Edit Post #291833 Post edited:
Copy and paste datasheet excerpts instead of posting screenshots as images. Text is searheable, screenshots aren't.
5 months ago
Edit Post #291709 Post edited:
5 months ago
Edit Post #291709 Initial revision 5 months ago
Question STM32. What should be done in firmware for VBUS detection through a GPIO pin?
I've got a is self-powered USB device, which means that I have to do VBUS detection. The device is built around STM32G474. Unlike some other STM32s, the STM32G4 don't have a dedicated pin for VBUS detection, so I have to do it through a GPIO pin and firmware. VBUS is connected to the GPIO pin PA10 ...
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5 months ago
Comment Post #291671 ESD straps have a built-in 1MΩ resistor. [Example.](https://www.mouser.com/datasheet/2/107/TB_S0101-3132271.pdf)
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5 months ago
Edit Post #291385 Post edited:
Fixed spelling in the title.
6 months ago
Comment Post #291461 @#82425 What's the purpose of this device? What do you ultimately need to accomplish? The question is missing the context.
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6 months ago
Comment Post #291386 @#53469 Only the position of the dots relative to each-other matters. If both dots are on the same side, then it's a common mode choke (both on the left side, or both on the right side, doesn't matter which side). If one dot were on the right and another one on the left, then it would be a differe...
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6 months ago
Edit Post #290231 Post undeleted 6 months ago
Edit Post #290231 Post deleted 6 months ago
Edit Post #291311 Post edited:
7 months ago
Edit Post #291311 Post edited:
7 months ago
Comment Post #291238 Component ID question questions have to meet certain guidelines. Here’s our [present version of the guideline](https://electrical.codidact.com/help/compid). EE.Codidact isn’t inundated by identification and repair questions, and that’s not a bad thing. After some number of such questions accumulat...
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7 months ago
Edit Post #291238 Post edited:
7 months ago
Comment Post #291238 @#53279 Check the output of the unidentified 331 chip on the undamaged unit. Probe the voltage at the middle pin, and at the other tantalum capacitor (the East-West one). It may be a boost switcher. That would explain two things: the connection of the inductor, the diode between pins 2 and 3. If...
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7 months ago
Comment Post #291240 Yes, that’s a SOT-89. I looked up switch mode regulators [with integrated MOSFET] on DigiKey, and there are none in SOT-89. Maybe it’s a linear regulator, or a transistor.
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7 months ago