how can people post things this stupid?

It's just a dumb quiz...although the output time constant of 2kHz seems a b it high for audio, and it only needs a single input coupling capacitor to t he junction of the bias current setting diodes. Single-ended obviously refe rs to the power supply, and the push-pull part is right, because of the ac- coupling on the output, the load is being driven from a +/-10V source.

Other than the stupid title, it's rather like a lot of quizzes I had in college. It's simple enough to analyze quickly and does test some knowledge. It's not a suggested design. That was the intention, no?

It isn't just analogue that even professionals have trouble with. At an Orange County engineering firm that will remain nameless, I've been having to use large blunt instruments to get folks to understand the simplest calculations, e.g. how much lubricant instability can we stand before we use up our mechanical error budget. That one's really tough--an angular tolerance times a diameter. Turned out to be +- 70 nanometres, which is pretty hard to do with grease--it needs dry MoS2. Went over their heads like a Cessna. They shipped two units unlubricated and were greasing the rest until I nabbed them.

Good luck getting them to calculate anything whatsoever on their own, despite which they want to redesign everything.

And the "expert" that wrote the digital lock-in software turned out to know zero about signals and systems. The optical guy and one of the mechanical guys are okay.

The sheer mental laziness is what astounds me. Why go to engineering school if you aren't interested in engineering?

Cheers

Phil Hobbs

"Professional" is the most pathetically overrated and misused word in modern English. All it has come to mean is pathetic asshole nobody for the most part. The word you want is expert.

On Saturday, March 1, 2014 12:18:27 PM UTC-5, Phil Hobbs wrote: .

$$$

Not for long, if you're that bad at it.

Cheers

Phil Hobbs

In the US they just falsify the resume and move on to another top heavy corporate mess.

On a sunny day (Sat, 01 Mar 2014 12:08:22 -0500) it happened snipped-for-privacy@attt.bizz wrote in :

The power goes into the matching (100 OHm or so) resistor, makes no sense to make a complicated amp.

It al ldepends on the cabling to have to work with.

For 10 $ I will say publicly you are right, For 30 $ i will say it twice. Fow 300 three times. :-)

Yea.

On a sunny day (Sat, 01 Mar 2014 08:56:26 -0800) it happened John Larkin wrote in :

You never use heatsinks?

Even if it doesn't die from thermal runaway, the answers that they calculate are absurd.

Sounds like not many people here get it either, affirming my point.

Not if you're using a class-AB amp to drive your line.

The particular driver chosen depends on the cabling but the point about choosing a driver designed for the task, doesn't. Show me where it's beneficial to use a class-AB amplifier to drive a digital signal.

I didn't even look at their calculations. I don't think the point was to show that it was somehow "good". It's a just a "quiz".

On the contrary. Most here did get it. Again, it's quite like the material covered in such college courses. I didn't see anywhere that suggested that it should even be built.

PALwHUB is just out doing his usual... trying to pick a fight. ...Jim Thompson

They calculate the answers to the "quiz", and they are wrong.

It's weird to be in a business (profession?) where most of the paid, college-grad practitioners and most of the publications are, well, not very competent. Sort of like being an economist.

For the answers they say:

Source: Floyd, T. (2005). Electronic Devices Conventional Flow Version. 7th Ed. p.443. Upper Saddle River, NJ: Prentice Hall.

The "conventional flow" garbage gives it away, you can only take the water in the pipe analogy just so far...but the editors of the quiz may have inte rpreted the text wrongly too, which is likely if they're so dammed dumb the y can't see immediately they're not even close.

List price is $136, but you can get it from B&N for only $106.

No, those go for MBAs. Engineering is a vocation.

Jeroen Belleman

What is "lubricant instability" in this context?

I can see that a lubricated shaft, in a bored hole, might wiggle around if the lube isn't uniformly distributed in the radial gap. Is there some interesting dynamics there?

Engineering teams, prodded by managers, should bring in consultants to review their designs before they embark on the many-prototype-iteration path. There are lots of guys around who could really help them avoid blunders, some of them retired folks who post here.

It almost never happens. There are lots of electronic products around that work, and I suspect many were designed by random mutation and natural selection, ie, lots of prototype iterations.

er in the pipe analogy just so far...but the editors of the quiz may have i nterpreted the text wrongly too, which is likely if they're so dammed dumb they can't see immediately they're not even close.

"Tom Floyd received his BS degree in electrical engineering from the Univer sity of Florida in 1964 and began his industrial experience at Texas Instru ments Inc. in Dallas, Texas the same year. While an engineer at Texas Instr uments, he received his master's degree in electrical engineering from Sout hern Methodist University in 1968. During his association with Texas Instru ments, Mr. Floyd worked as a design engineer on several projects including terrain-following radar, Airborne Warning and Control System (AWACS), and c lassified communications systems.

After leaving Texas Instruments in 1969, Mr. Floyd joined Martin-Marietta C orp. in Orlando, Florida as a Senior Engineer. While at Martin-Marietta, he worked on missile guidance systems and digital communications systems, amo ng other assignments. He also taught electronics courses on a part-time bas is at Valencia Community College. Then in 1973, he joined the full-time fac ulty at VCC as Program Director for the new Electronics Technology Program, with responsibility for developing the curriculum, designing the laborator ies, selecting the staff, and teaching courses. He also did consulting work for Martin-Marietta during this time. While at VCC, Mr. Floyd wrote his fi rst textbook, Digital Fundamentals, which was published in 1977 and is now in its eighth edition.

In 1977, Mr. Floyd joined the faculty of Mayland Community College in Spruc e Pine, North Carolina and taught in the Electronics Technology Program the re for five years. During this time, his second book, Principles of Electri c Circuits, was published.

In 1983, Mr. Floyd began devoting all of his time to writing and, in 1985, Electronic Devices was published. The two textbooks, Electronics Fundamenta ls: Circuits, Devices, and Applications and Electric Circuits Fundamentals followed in 1987. Two more texts, Fundamentals of Linear Circuits and Basic Operational Amplifiers and Linear Integrated Circuits were completed a few years later.

Currently, Mr. Floyd devotes much of his time to revising and improving his textbooks and hopes to continue to do so for many years to come. He is als o trying to find time to begin a new writing project."