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Meta Welcome to Electrical Engineering!

Welcome and thanks, Monica. It might be good to set some basic expectations in terms of schematic diagram rather than word salad, sharp photos in case of identification questions, and inclusion of ...

posted 4y ago by spehro‭

Answer
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Meta Are we there yet?

Are we ready to let the world know about this site yet? What, if anything, do we still need to do or set up first? I have created a bunch of help pages that are intended to give newcomers a good i...

2 answers  ·  posted 4y ago by Olin Lathrop‭  ·  last activity 4y ago by Andy aka‭

Question discussion
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Q&A Tools required to burn code in a quad flat microcontroller

The days of socketed microcontrollers are long gone. In most cases, the socket would cost more than the micro. Nowadays, microcontrollers, whether in quad flat pack packages or not, are surface mo...

posted 4y ago by Olin Lathrop‭

Answer
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Q&A What are the most common causes of CAN bus communication errors?

I can't get my CAN bus application (ISO 11898-2, classic "high speed CAN") working and I'm receiving various CAN error frames. These error frames manifest themselves as sequences of 6 bits with my ...

1 answer  ·  posted 4y ago by Lundin‭  ·  last activity 4y ago by Lundin‭

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Meta Are questions about proper cable repair on-topic?

Lundin's answer notes: I just realized that the on-topic page https://electrical.codidact.com/help/topics doesn't address electronics assembly. It does now. I just added: Physical construction ...

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

Answer
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Meta Creating an additional "user"

There should be no problem in principle with a single person having multiple user accounts. The comment discussion in one of the answers to the feature request Signing in should sign you in on all...

posted 4y ago by Canina‭

Answer
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Q&A Purpose of emitter resistor in a common collector amplifier

First, let's nail down what circuit you are asking about. Your description is somewhat vague, so I picked this interpretation: Q2 is the emitter follower stage, driven by the previous common emit...

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

Answer
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Q&A High Speed Design - Which grounding strategy to choose?

You are right in that at high speeds, like over 2 GHz, things are different than in "ordinary" circuits. The post of mine that you quoted was written in the context of such ordinary circuits. The ...

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

Answer
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Q&A Buck-boost converter fed from split input supply

I have recently finished designing a buck-boost converter for a job that uses a split (+/-) input power supply. Load power is taken equally from both positive and negative input supplies and, the ...

1 answer  ·  posted 2y ago by Andy aka‭  ·  edited 1y ago by Lorenzo Donati‭

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Q&A Technique to reset pulse transformer core quickly

Is there any way to reset a core quickly without having ground / reference terminal pulled towards negative voltage Unfortunately not but, if instead of trying to send the complete pulse throu...

posted 2y ago by Andy aka‭  ·  edited 2y ago by Andy aka‭

Answer
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Q&A How to perform initialization of static storage variables in embedded systems?

Things happening/things we want to happen before main() is called: The code executed before main() is often referred to as "the C runtime (CRT)" or just "start-up code". This code is typically pro...

posted 2y ago by Lundin‭  ·  edited 1y ago by Lorenzo Donati‭

Answer
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Q&A How to perform initialization of static storage variables in embedded systems?

Whenever declaring a variable in C outside a function at file scope or when specifying it as static, it gets assigned a life time known as static storage duration. Meaning it will be accessible thr...

1 answer  ·  posted 2y ago by Lundin‭  ·  last activity 1y ago by Lorenzo Donati‭

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Q&A Deriving resistor values for a taper pad attenuator

A taper pad is a resistive attenuator that maintains impedances on both ports and provides a specific amount of gain-loss (A12): - I have derived formulas for each resistor (that I know to ...

3 answers  ·  posted 2y ago by Andy aka‭  ·  last activity 1y ago by Lorenzo Donati‭

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

[Disclaimer. This is not for an academic class. I'm self-studying.] I’m reading an introductory book on DSP for audio and computer music [Steiglitz 1996, ISBN 0-8053-1684-1 p. 287]. One of the ...

4 answers  ·  posted 2y ago by Nick Alexeev‭  ·  last activity 1y ago by Lorenzo Donati‭

Question filter audio DAC
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Q&A What are the key programming skills for an embedded systems engineer?

First, we have to clarify what you really mean by "embedded systems". There are many systems where something that is logically a PC is embedded. There is a whole industry around "single board com...

posted 2y ago by Olin Lathrop‭

Answer
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Meta How can we grow this community?

Embedding pictures is a pain in the ass. First you have to find the picture and save it locally then you have to drop it onto a special box before it can be processed. On SE, you just drag it to wh...

posted 3y ago by Andy aka‭

Answer
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Meta Creating a FAQ: how to read a datasheet

After reading various low quality questions Someplace Else today, it (once again) occurred to me that a whole lot of people, mostly hobbyists and engineering students, have no clue how to do the mo...

4 answers  ·  posted 3y ago by Lundin‭  ·  last activity 1y ago by Lorenzo Donati‭

Question discussion papers faq
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Q&A PNP Darlington pair as a current limiter

I am trying to analyse what is controlling the load current in the below Darlington configuration. Is it the base current of transistor Q3 which is controlling current through R14 / emitter curr...

1 answer  ·  posted 3y ago by kadamrohan16‭  ·  edited 1y ago by Lorenzo Donati‭

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Meta Why am I receiving so many downvotes at once?

Thank you for your report. This case is being handled. In general: We take our voting rules very seriously. Users should vote based on the content of a post and not based on who wrote it. It is al...

posted 3y ago by luap42‭  ·  edited 3y ago by luap42‭

Answer
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Q&A Press fit PCB receptacle for plated holes (Marked for non-plated holes)

I saw that this PCB socket: Is marked as pressfit for non-plated holes. However, can it be used with plated holes as well, or will it damage the plating inside?

1 answer  ·  posted 3y ago by Wilkins Ticklebum‭  ·  last activity 3y ago by Olin Lathrop‭

Question PCB
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Q&A Why do large RAM chips not have a serial interface?

I have a PIC32MZ2048ECG064, a 64-pin 32-bit microcontroller with 512kB RAM. This is not enough for my purposes, I need to extend it by at least 32MB, preferably 64 or 128. I believe this means I ca...

0 answers  ·  posted 3y ago by Keelan‭

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Q&A Design considerations for a differential pair

Differential pairs, such as for ethernet or a CAN bus, can be designed to be loosely coupled or tightly coupled. For a loosely coupled differential pair, the odd-mode and even-mode impedances are ...

1 answer  ·  posted 3y ago by DavidE‭  ·  last activity 3y ago by Olin Lathrop‭

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Q&A Why are there more N type than P type MOSFETs?

I was looking at different transistors, especially MOSFETS and I saw that N type MOSFETs seem to be way more popular to be used in circuit design. Is there a reason for that, or am I mistaken?

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

Question MOSFET
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Q&A Why are there more N type than P type MOSFETs?

There are two predominant reasons you see N channel FETs more than P channel: N channel is the natural polarity for ground-referenced switches controlling loads with positive voltages. This is co...

posted 3y ago by Olin Lathrop‭

Answer
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Q&A PCB Copper Layer Spacing & Voltage Rating

One standard used for spacing conductors based on voltage is the IPC-2221. This standard differentiates spacing requirements for inner and outer conductors. Does the IPC minimum separation betwee...

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