Electrical Engineering Weekly Newsletter
Electrical Engineering Weekly Newsletter

Top new questions this week:

Why is there so much fear surrounding LiPo batteries?

I've been trying to design a charging system for a small robot powered by a 2S 20C lithium polymer (LiPo) battery. Were I to trust everything I read online, I would believe that the LiPo will kill me ...

batteries lipo  
asked by Cerin 145 votes
answered by metacollin 323 votes

How can we be sure that computers will never accidentally switch a 0 by a 1?

I've read a bit about the construction of a digital computer in Shocken/Nisan's: The Elements of Computing Systems. But this book says nothing about certain electrical aspects in computers, for ...

computers computer-architecture  
asked by Voyska 41 votes
answered by duskwuff 86 votes

Why are SMD LEDs shipped in a sealed bag containing desiccant?

I had a selection of 0805 LEDs in my last Mouser order and was a bit surprised to discover they arrived in heat-sealed (rather than folded and taped with sticker) bags containing a desiccant bag and ...

led soldering surface-mount humidity  
asked by scanny 30 votes
answered by Tom Carpenter 46 votes

What is the use of an op-amp whose output and inverting input are connected to ground?

I am in first year of Engineering school and I was given an assignment containing this circuit, which drives pressure sensors in a pitot tube : I am struggling to understand the whole circuit, and ...

op-amp circuit-analysis schematics virtual-ground  
asked by Magix 19 votes
answered by pipe 33 votes

What is a "risk wafer"?

In integrated circuit manufacturing I came across the term "risk wafer" which seems to be different from a "normal" wafer. But I can't find any information online on what a risk wafer really is.

integrated-circuit manufacturing  
asked by Fritz 12 votes
answered by placeholder 16 votes

How can I improve this Ethernet differential pair?

This is my first 100 Mbit/s Ethernet project (I am doing it to learn more about differential signals). I did two things that I don't know if are good or bad in this particular case. One is to route ...

pcb-design differential routing kicad  
asked by Javier Loureiro 9 votes
answered by Michael Karas 7 votes

Why to disconnect the negative/ground terminal, not positive?

To break off any circuit, the common way is to disconnect the negative and or ground terminal. I rarely see people disconnecting the positive and if so, they're not well educated in electrical ...

voltage amperage switching  
asked by Sempie 9 votes
answered by Spehro Pefhany 16 votes

Greatest hits from previous weeks:

What does edge triggered and level triggered mean?

I am studying 8085 microprocessor architecture and the word edge triggered and level triggered confusing me really very much. Can anyone explain me it in layman's words ? While studying the ...

interrupts 8085 level trigger  
asked by ankurtr 20 votes
answered by Rick_2047 21 votes

Slow Blow vs Fast Acting Fuse

Is there any way to tell the difference between a slow blow and a fast acting Fuse? I had one blow in my amp and I know its 125v 5a, but i'm not sure if it is a slow blow or fast acting fuse. Is ...

asked by Sean 14 votes
answered by Harry Weston 18 votes

Can you answer these?

Wired MBus Design - Circuit and Communication

Been working putting a wired Mbus circuit for a while now for both the master and the slave. For the slave, I am using the ON Semi NCN5150 Slave Chip and built the circuit just as the development ...

uart communication  
asked by Paul A. 1 vote

cheapo CCFL LCD keeps colour-drifting - what is the cause?

My display's (Phillips 231E) white point drifts continiously. Once I have created profile for it it will be fine for some time but then it will shift slightly or badly. For example: in some cases I ...

glcd colour ccfl  
asked by Euri Pinhollow 1 vote

Unknown resistive disk in parallel with AC motor capacitor

This assembly is the motor connector for a Grundfos U15-38SPA circulating pump, which interfaces to the capacitor (2uF) and power supply (220VAC). Between the two brown wires leading to the cap is ...

capacitor motor identification  
asked by HiTechHiTouch 3 votes
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