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Q&A What are some best practices for library management?

As the others said, there is no definite answer to this. But here is how we do it: There is a global schematic library and a global footprint library. They have the components we use and have the ...

posted 1y ago by H_H‭  ·  edited 1y ago by H_H‭

Answer
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Q&A CAN BUS monitoring with a LED

I've done similar things on UART lines, but for significantly lower baudrates (9600 etc) than traditionally used on most CAN buses. It's also easier to do when you have 5V guaranteed to be well-ov...

posted 1y ago by Lundin‭  ·  edited 1y ago by Lundin‭

Answer
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Q&A IEPE Sensor Internal Circuit

Based on reading the All About Circuits article on IEPE sensors there are two general types of circuits integrated into this class of sensors: voltage amplifier and charge amplifier. This question...

0 answers  ·  posted 1y ago by DavidE‭

Question Analog sensor
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Q&A When and where to use vias in an IC design layout

Vias are used to move up in metal layers. The contacts of the transistors can be directly connected with metal 1, but if you want to use higher metal levels, you move up to them with vias. For exa...

posted 1y ago by Designalog‭  ·  edited 1y ago by Designalog‭

Answer
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Q&A Can I make an AC inductor (reactor) rated 75mH 40A from a 3-phase induction motor?

An induction motor with its shaft held still will mostly look like an inductor with a series resistance electrically. However, there will be some issues: It will be difficult to guess the inducta...

posted 1y ago by Olin Lathrop‭  ·  edited 1y ago by Olin Lathrop‭

Answer
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Q&A Noise from oscillator on top layer to clock on bottom layer with VCC & GND layers between

What effect does an oscillator potentially have on a SPI clk signal if the oscillator is on the top layer, with GND and VCC layer in between on a four layer board. I know running it on the same lay...

2 answers  ·  posted 1y ago by Hawk2020‭  ·  last activity 1y ago by Nick Alexeev‭

Question oscillator pcb-layout
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Q&A Noise from oscillator on top layer to clock on bottom layer with VCC & GND layers between

It's hard to answer your specific case since you didn't label the layers in your picture, or which traces are doing what. That said, a few traces crossing each other on different layers is not muc...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A Noise from oscillator on top layer to clock on bottom layer with VCC & GND layers between

What you are proposing may be okay (depending on other specifics of the design), but your proposed 4-layer PCB stack-up looks like a compromise. Clock is a high speed signal, and so is SPI dependi...

posted 1y ago by Nick Alexeev‭  ·  edited 1y ago by Nick Alexeev‭

Answer
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Q&A Converting 5V to ±12V

I only address this point: Are there some other way how to do this which I have not covered? Yes. Instead of using boost and buck converters, you can use integrated charge pumps. They don't u...

posted 1y ago by H_H‭  ·  last activity 1y ago by H_H‭

Answer
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Q&A CAN BUS monitoring with a LED

Hi, how can I use can bus monitoring through a simple led without disturbing the can line , I started with a diagram found on this forum, I need your help to correct where necessary, I want to use...

3 answers  ·  posted 1y ago by Marian_20099‭  ·  last activity 1y ago by Lundin‭

Question CAN-bus
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Q&A CAN BUS monitoring with a LED

You'll need a differential comparator, something like what was suggested in here. But I'd look for a proper Canbus Rx and extract that to convert to single ended one shot to pulse for activity.

posted 1y ago by TonyStewart‭

Answer
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Q&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 technic...

posted 9mo ago by Nick Alexeev‭  ·  edited 9mo ago by Nick Alexeev‭

Answer
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Q&A What are these mystery components (one of wire coil, another labeled "100-10L A9")?

The component with the coil of wire is an inductor. Judging from the small size, it is probably only a few µH. There are lots of uses for inductors, like for filters, switching power supplies, tu...

posted 12mo ago by Olin Lathrop‭  ·  edited 12mo ago by Olin Lathrop‭

Answer
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Q&A Calculating base voltage of NPN transistor

I'm having trouble using the nodal equations to determine the base voltage Vb1 in the circuit below. I've attempted to write seven equations below, but not able to fit them in entirely. (12-Vx)...

2 answers  ·  posted 11mo ago by kadamrohan16‭  ·  last activity 11mo ago by LvW‭

Question Analog BJT circuit-analysis
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Q&A Understanding inductive ringing

For my own understanding I tried modelling switching off an inductive load without a freewheeling diode to observe ringing. This is the model I used: 1.) Are the two main components of the reson...

2 answers  ·  posted 11mo ago by Elleanor Lopez‭  ·  last activity 11mo ago by Olin Lathrop‭

Question inductance
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Q&A MOSFET drain current ringing in saturation region

I benchtested below 0.7A constant current source circuit and observed few cycles of oscillation on drain current. With the help of bode plot analysis , I have managed to reduce the oscillations on ...

2 answers  ·  posted 1y ago by kadamrohan16‭  ·  last activity 1y ago by Olin Lathrop‭

Question Analog MOSFET current-source opamp power-amplifier
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Q&A Understanding inductive ringing

are there more elements contributing to this effect that I have not placed in the circuit? Definitely, but it's hard to say how relevant they would be. The real world is messy. There is parasiti...

posted 11mo ago by Olin Lathrop‭

Answer
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Q&A STM32. What should be done in firmware for VBUS detection through a GPIO pin?

What should the firmware do when it detects that VBUS (re)appeared? What should the firmware do when VBUS has disappeared? I'm not familiar with the STM32 USB library, and have only dealt with th...

posted 10mo ago by Olin Lathrop‭  ·  edited 10mo ago by Olin Lathrop‭

Answer
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Q&A Missing voltage rating

I am looking at this RF connector. I see that insulation resistance and breakdown voltage are specified, but no voltage rating: I have two questions, one functional and one safety. Functionally...

2 answers  ·  posted 10mo ago by Elleanor Lopez‭  ·  last activity 10mo ago by Olin Lathrop‭

Question connector
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Q&A How do we calculate signal rise time from frequency

Your question is ambiguous. First, you need to define "rise time". That applies to a step, not a periodic signal. Let's say you have a 0 to 5 V digital signal. The rise time is how long it take...

posted 11mo ago by Olin Lathrop‭

Answer
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Q&A Control logic for mosfet in piezoelectric energy harvesting circuit

Every real part has resistance including your piezo current source. Every switch resistance is a loss in energy (I^2 R * t)=E and includes diode and transistor switches. What you need, I think, is...

posted 12mo ago by TonyStewart‭

Answer
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Q&A Using only ceramic capacitors on an input of an SMPS - unclear advice from manufacturer

First, note this only applies when the line to the input power source is long enough to have significant inductance. If the power source is on the same circuit board, then this isn't an issue. Th...

posted 9mo ago by Olin Lathrop‭

Answer
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Meta Professional vs Hobbyist advice and potentially dangerous projects

The main problem with a question along the lines of "how do you design a product for medical applications" is that it's way too broad. You cannot reasonably write a somewhat complete answer because...

posted 1y ago by Lundin‭

Answer
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Meta Tags about quantities: should we have them?

Using voltage as a way of saying "I'm dealing with voltage here" is pointless - most electronics questions do. I think the voltage vs current tags are however relevant in the case when you need to...

posted 1y ago by Lundin‭  ·  edited 1y ago by Lundin‭

Answer
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Meta Tag naming guidelines.

I agree with everything said. I didn't really consider until now that Codidact (unlike Someplace Else) supports case-sensitive tagging. So in addition, perhaps add a note regarding the following: ...

posted 1y ago by Lundin‭

Answer