Electrical Engineering Weekly Newsletter
Electrical Engineering Weekly Newsletter

Top new questions this week:

What limits CPU speed?

I've recently talked with a friend about LaTeX compilation. LaTeX can use only one core to compile. So for the speed of LaTeX compiliation, the clock speed of the CPU is most important (see Tips for …

cpu physics  
asked by moose 23 votes
answered by fuzzyhair2 29 votes

SCR in this circuit exploded - why?

Some of our boards have a damaged SCR. I just witnessed one in person today. The SCR actually exploded upon power-on. A part of its packaging material just flew off along with an exploding sound. …

power current scr  
asked by Brian Wang 10 votes
answered by Spehro Pefhany 5 votes

How is the internet able to transmit data so fast?

I'm not sure if I'm in the right place or not, but I figured someone here could maybe provide a good answer. I want to know how electricity is able to flow so fast. For example videos games nowadays, …

current electron  
asked by Skateguy 9 votes
answered by Evangelos Em 13 votes

Polyfuse (resettable PTC) lifetime

There is a proposed design that could have a polyfuse tripping many times. Is there any lifetime to these things? Number of resets? I looked here but could find no such spec. …

polyfuse ptc  
asked by George Herold 6 votes
answered by Anindo Ghosh 2 votes

Flash memory: Does the entire page need to be erased before writing just a few bytes?

An easy question, I hope! I'm not finding any definitive answers... I'm writing drivers for a SST25VF064C flash memory chip. It communicates via SPI. Like all flash memory (that I know of), it …

asked by bitsmack 5 votes
answered by Dave Tweed 5 votes

What is this component with metal tabs?

I am working with a Firgelli Linear Actuator Control board and came across an unusual component. At first I thought it was a heatsink, but there does not appear to be any component under the metal. …

asked by JYelton 5 votes
answered by Ignacio Vazquez-Abrams 6 votes

How does a non-FPGA (ie a PC with a CPU, RAM, hard drive) mimic logic gates?

I know that an FPGA uses look-up tables (LUTs) to synthesize logic gates. A LUT is a block of RAM that is indexed by a number of inputs. The output is the value stored at that memory address. The …

digital-logic fpga cpu  
asked by user3716057 5 votes
answered by Chris Stratton 12 votes

Greatest hits from previous weeks:

Good Tools for Drawing Schematics

I was going to add a bit of information to my post on a previous day using schematics and some instructions. What programs are being employed for this purpose. I mostly want to see what others are …

schematics education eda  
asked by Kortuk 144 votes
answered by Jay Atkinson 54 votes

How do I fix an Omron d2fc-f-7n microswitch from unwanted clicks?

Omron d2fc-f-7n microswitches are used in computer mice all around, and they eventually start clicking several times per hit. AFAIK there is a flexible metal plate that wears out due to metal fatigue, …

switches repair  
asked by user1306322 12 votes
answered by Rocketmagnet 13 votes

Can you answer these?

Bluetooth low energy communication

I was wondering if it is possible to communicate between 2 BLE devices when one is placed inside the car and another placed outside the car. Can BLE communicate in such a scenario? For example, I …

communication bluetooth-low-energy  
asked by user2280164 2 votes

GerbV (Gerber Viewer): How to do PNG export of only area within board outline?

Gerbv (open-source Gerber viewer) has the neat ability to export a customizable rendition of a given layer-stackup, to an output PNG. But no matter what I try, I'm unable to come up with any way to …

pcb gerber  
asked by boardbite 2 votes

Protect drone from lightning

I am designing a dirigible, robotic drone. It is basically a polyurethane airship, approx 3.6 m length and 2.1 m diameter. I am worried about lightnings: as far as I know, a Faraday Cage should be …

protection drone  
asked by Matteo Monti 2 votes
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