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On the slide 24 about the Power Spectrum, why and how  does the frequency F affect the system?

Iron

Thank you for the great presentation. 

Iron

Hello from Gold River.

Iron

Very Interesting.  Thanks, from a budding Electronics Technology student!

Iron

Thank you for the informative session with good resources. Lacture was fine and interesting!

Iron

Thank you for the info and resources.  Good way of understanding speed- requires total shift in attitude.

Iron

i will just take a rest then proceed with part II...

all the day, i've spent my time for digi-key continuing education...

I NEED TO FINISH AND GRADUATE OF ALL THE COURSES OFFERED...

THANKS AGAIN....

thanks for advise sir jon and sir alex for the entertaining lectures...

once again, i am thankful for the coverage that you've shared to us again...

nice presentation!

good day & thanks.

yap, timing analysis and application are most applicable....

i am just listening with the Q & A, interesting with the inputs via questions delivered by sir alex

it depends on engineering discipline you are going through, because what topic that sir jack presented more on programming. so, it might be software engineering, i think so...

i think, i will go through with that references that sir jack referred to...hope in other way, i can understand the lecture somewhat those gave me confusion. however, the presentation is really good on the topic referring to.

GREAT!

it's so confusing about the subject causing me crazy how does those formed...

anyway, i am now on slide 26

i am now in slide 14, it finds me difficult to understand how these formed...

i have found difficulty when leaving a post...anyway, i am now stating with the lesson with sir jack...

Good evening from Chicago

Iron

Good morning from San Jose, CA.

 

Iron

It is great presentation!

Great Presentation ! Thank you

 

Iron

Great presentation! Thanks!

Iron

Good presentation. Thank you!

Iron

Ask the people listening to turn up their PC volume

Iron

Not only could "long" mean only a few inches, it will inevitably become shorter as the frequency rises.

Iron

Thank you Jack and Alex for another great presentation.

Iron

Wow, slide 25 is pretty impressive from only 10" of wire, but what was the electric length (with respect to the frequency/wavelength)?

Iron

Ok, Jack did miss slide 23. 

Iron

I am pretty sure that Alex pointed out a few slide changes that Jack already announced. 

Iron

Great series! Thanks!!!

Iron

I have not done any programming for years.  We were using FORTH at the time.  This has been very interesting as to what my software buddies, and perhaps me again some day, have to consider.

 

 

Iron

Thanks Jack, well done!

 

Micro C OS II and III work well for RTOS development. but if you are familiar with another you should stick with what works.

Iron

Developing code to work on multicore systems is difficult at first but after you have done several of them it gets easier.

Iron

I've seen one line of C code do the work of 15 plus instructions in assembly language for various things in the automotive industry.

Iron

Some of the coding that is done in C can be done better in Assembly and vice versa.

Iron

Jack, I especially enjoyed your examples of code that won't work and why.  Very helpful.

Gold

Thanks for arranging an excellent lecture

Iron

Very insightful, thank you

Iron

Tomorrow will be here

Iron

ok Thanks much Jack, look forward to more indepth during week

Iron

So, I can only thank Jack for bringing real-time wisdom to the MPU design world. After all, concurrent issues will continue to rise, perhaps exponentially. :o)

 

Iron

looks like it ... I have some work left, too. Until tomorrow, then

Iron

Are we done with the chat?

Iron

OK now my capts problem is fixed.

Iron

IRON
 I don't know why i can only write in capital. it's not the caps lock.

the high level lenguages do have varying degrees of overhead. however. there is no guarnatee that a program designed in high level will get more machine instructions than a code developed in assembler, except for very simple programs.

i will let jack answer that question in more accurate terms.

Iron

Modern Ada might be very good, but how does it get around the problem you've shown in the initial slides? Does Ada say: Sorry, dear, not on this platform, I have a headache?

Iron

What demands does Ada have on the underlying hardware? Looking at the first slides, I get suspicious if high-level languages claim to be able to do realtime things.

Modern Ada compilers are very good. The RAVENSCAR profile (a set of features) leads to very small code basis.

Iron

Jack, don't you think the industry needs to develop a benchmark tool, so that NON-RT solutions can be compared to standard (to be developed) RT ones so designers can strech their artistic/intuitive achievements? That would make the RTOS part of a standard metric.

Iron

RTOS developers publish code execution time guarantees based upon scheduling algorithm they employ? What characteristics are made available for those who intend to use the RTOS, from which to evaluate the worth of adopting it?

Most RTOSes are very fast; if the diff in speed between two RTOSes is a concern then I think one should be looking at a better CPU. The differentiators are the features - and you need to know which ones you need - pricing, royalty models and support. The vendors are pretty good at advertising their feature sets, and not so good at advertising costs and support. I've worked with a lot, and have found them generally very, very good. The more complex add-ons you buy - like TCP/IP - the higher the odds you'll find problems.

Iron

luizcosta: your capslock is on
What demands does Ada have on the underlying hardware? Looking at the first slides, I get suspicious if high-level languages claim to be able to do realtime things.

Iron

RTOS developers publish code execution time guarantees based upon scheduling algorithm they employ? What characteristics are made available for those who intend to use the RTOS, from which to evaluate the worth of adopting it?

Iron

SPEAKING OF REALIABILITY ADA IS ONE OF THE FEW (IF NOT THE ONLY ONE) LANGUAGES THAT HAVE REAL-TIME INSTRUCTINS TO DEAL WITH CONCURRENCY. FOR THOSE WHO ARE NOT FAMILIAR WITH THE CREATION OF ADA IT STARTED BY THE DEPT OF DEFENSE THAT MADE THE FIRST EFFORT TO ORGANIZE THE TOO MANY OPTIONS IN THE MARKET. THERE IS A GROUP IN THE ADA COMMUNITY FOR EXAMPLE THT IS DEVELOPING CODE WITH THE LEGO MINDSTORM BORADS.

Iron

yep ... saw that when I had to explain some arduino code to my kids, when they insisted on blinking LEDs and sound at the same time :-D

Iron

jack21: How far would you go before using an RTOS? If you, e.g. partition your system sufficiently far, you might be able to pull off some amazing things with very simple architecture for the single MCU. I am amazed at what Chuck Moore's most recent generation of chips does...

Tough question! An RTOS will bring added complexity. But if your system needs to manage multiple independent things, consider one. For instance, if it has to handle buttons, display, comm, and whatnot non-RTOS code quickly gets ugly.


Iron

How can one get an idea of speed as a performance objective vs the compiler employed?

You can demand it from the vendor, but few know. All one can do is run tests for critical sections of code. I think it's criminial they don't profile their stuff, but after years of nagging them have had no luck.

Iron

jack21: How far would you go before using an RTOS? If you, e.g. partition your system sufficiently far, you might be able to pull off some amazing things with very simple architecture for the single MCU. I am amazed at what Chuck Moore's most recent generation of chips does...

Iron

How can one get an idea of speed as a performance objective vs the compiler employed?

Iron

JACK, IN MY VIEW, THE BEST ASPECT OF YOUR PRESENTATION, IS THAT IT HAPPENED. I REFER TO THE FACT THT IT SHOW THAT COMPANIES ARE AWAKENING TO A NEW GENERATION OF EMBEDDED SYSTEMS FOR MORE EFFICIENT TECHNOLOGICAL DEVELOPMENT. AFTER ALL, IT'S ALL ABOUT DESIGN EFFICIENCY IN A FAST PACED AND MORE COMPLICATED WORLD.

Iron

one thing that has been bugging me: to RTOS or not to RTOS ... whether 'tis better for my peace of mind if I know the slings and arrows of my own doing or, by reusing prebuilt stuff, suffer

I think it's a bad idea to reinvent the wheel. Fun, you betcha. But it's tough to get an RTOS right. Most of the homemade ones I see don't have much in the way of queues, mailboxes and the like, so the reentrancy issues for the application become huge.


Iron

huh ... I might have inadvertently described the difference between what Jack called a "programmer" and an "engineer" ... i.e. narrow-minded code-monkey-ness vs. system-level cogitation

Iron

Very good presentation

Iron

one thing that has been bugging me: to RTOS or not to RTOS ... whether 'tis better for my peace of mind if I know the slings and arrows of my own doing or, by reusing prebuilt stuff, suffer

Iron

Well said !. You are right, Mr Schmiedl

Iron

JACK, IS THERE ANY SUITE DESIGNED TO RANK RTOS?

No, because everyone has different needs. But the vendors will be happy to tell you which RTOS to use ;)

Iron

JACK, IS THERE ANY SUITE DESIGNED TO RANK RTOS?

Iron

and most of all: the software developer _must_ know what he/she is doing. Most of the failures I see can be attributed to the "not my problem" attitude

Iron

Any input on Nucleus RTOS? why did it not succeed this much?

I don't see as much of Nucleus as I once did. It went through some buyouts and the original people left.

Iron

Thanks Jack. I got a good insight  on hearing your lecture

Iron

re linux and realtime... I know high-load servers getting sooo busy that monitoring software reports them as "down" because they won't respond to ping within 10 seconds, since they're too busy flushing stuff to disk.

Linux was never meant for embedded, but embedded grew so that the processors could handle it. It still requires a lot of power and memory.

Iron

I RECOMMEND THE NEW BOOK (2012) BY DOUG COMER FROM PURDUE. HIS NEW BOOK ON OS DESIGN WORKES FROM THE VERY SIMPLE OS ROUTINES TO THE MORE INTRICATE ONES. AND ALL THE CODE IN THE BOOK CAN RUN ON XINU. AS A MATTER OF FACT HE TEACHES HOW TO COMPLETE THE XINU BASIC KERNEL.

Iron

thanks, jack21, this was an hour well spent for me.

Iron

Any input on Nucleus RTOS? why did it not succeed this much?

Iron

re linux and realtime... I know high-load servers getting sooo busy that monitoring software reports them as "down" because they won't respond to ping within 10 seconds, since they're too busy flushing stuff to disk.

Iron

Is there any book which have similar special tips on effective coding in embedded systems  like what you had mentioned? I had remained for long hardware wngineer

Some in the David Simon book. But otherwise, alas, no.


Iron

slide 5: what does "7.3" mean WRT floating point numbers between 0 and 1?

That would mean 7.3 decimal digits, or 1 part in 10**7.3.

Iron

Is there any book which have similar special tips on effective coding in embedded systems  like what you had mentioned? I had remained for long hardware wngineer

Iron

Do you think Android is stable enough to meet the reliability demands of embedded systems and devices?

For some systems it's fine. For high-rel or high-security it's not. Linux is rated at security level EAL4+, the same as Windows; EAL4 means it's secure if no one tries to break in. I don't think Android has been rated yet.

Iron

slide 5: what does "7.3" mean WRT floating point numbers between 0 and 1?

Iron

YOU KNOW, JACK, I'VE BEEN TEACHING IN ENGINEERING TECHNOLOGY PROGRAMS FOR THE LAST 4.5 YEARS, AND I NEVER HEARD OF ANYONE TEACHING ABOUT "IMPEDANCE MATCH." ISN'T THAT CRAZY, WHAT IS HAPPENING IN EDUCATION?

Iron

I READ THAT LINUX AS A RTOS IS IFFY, IS THAT A CORRECT ASSESSMENT?

Linux is not real-time, but some people run it on top of an RTOS, like VxWorks. Linux handles files, comm, etc, and the other tasks do the really real time stuff.

Iron

Do you think Android is stable enough to meet the reliability demands of embedded systems and devices?

Iron

slide 13: is there a "correct" way to wait for a resource to become available again? Or is the answer going to be "don't wait, have somebody tell you?"

Iron

I READ THAT LINUX AS A RTOS IS IFFY, IS THAT A CORRECT ASSESSMENT?

Iron

slide 25: how do/can you avoid bouncing when your scope cables _are that long_?

 

Doesn't matter if they are properly set up. The issue with probes is rise time. You can make a very fast probe with 3' of RG-58U, a short 1K resistor on the end, very tight braid-to-board line. And, you must set your scope for 50 ohm impedance. This is a divide by 21 probe, but it is excellent.

Iron

Linux's success (and Android) in the mobile market is largely due to the great ARM ports, the so-called "free" nature of it, it works well, and it supports a zillion I/O devices.

Iron

IF RIM GOES BACKRUPT I BEG RIM'S CHAIRMAN TO GIVE QNX BACK TO THE FOUNDRY27 COMMUNITY.

 

Iron

slide 25: how do/can you avoid bouncing when your scope cables _are that long_?

 

Iron

It is interesting that we seem to re-experience everything.  Mathematical approximations for the mainframe, then for midrange, then PCs and finally into the world of Embedded Systems.

 

Iron

Q.1 Any similarity to the use of semaphores and saving of program state while executing  critical  portions of code?

Q.2 Are the use of shceduling algorithms also incorporated for multi-tasking? how does this OS timing and application routine timing accounted for in evaluating worst case response?

Iron

I thought it was 0.35 instead of 0.5 on the top of the equation ( Time vs BW ) Am I wrong ?

Iron

Since it's quiet - someone asked about QNX and another about parallel processing. QNX was an early leader in an OS for multiple processors.

Iron

YES, RIM BOUGHT UP QNX SOFTWARE SYSTEMS IN THE SUMMER OF 2010 SO THEY CAN KEEP THE CARS AND DON'T LOOSE THE EDGE WITH THE USE OF SMART DEVICES IN THE AUTO INDUSTRY, WHICH THEY ALREADY HAVE SIGNIFICAN PRESENCE.

 

Iron

The "Cool Tools" page on Jack's website - http://www.ganssle.com/tools.htm - is really, really impressive.  A quick glance at that page and I already found a good replacement for HyperTerminal.  HyperTerm is no longer supported by MSFT and does not work on Win 7.

 

Iron

Other than open source what do you think is the biggest reason for Linux's success in mobile devices?

 

Iron

QNX  is a great OS. I wonder what will happen to them? RIM is hurting.

Iron

Have you done any work, or recommend anything using parallel processing for real time measurements, or other things?

Multicore is the rage (in the press) but often has big problems unless the problem is inherently parallel. Async multicore (two or more CPUs with their own address space is a great solution.

Iron

Yes, It's interesting that QNX is getting into Smartphones...

Iron

JACK, PLEASE, GIVE YOUR IMPRESSIONA ON QNX.

Iron

Can you point us to the appoximation functions on your website that you mentioned (adapted from "Comptuer Appoximations, byt John Hart)?

See http://www.ganssle.com/spcl_reports.htm and look for approximations.

Iron

@abarman

If you believe that your corporate network is blocking the audio or the audio player, please have your IT department un-block the following domains:

  • Blogtalkradio.com
  • llnwd.net

 

Iron

Have you done any work, or recommend anything using parallel processing for real time measurements, or other things?

Iron

tell people to put their volume to max

 

Iron

but adding assembly will result in additional porting effort for different architectures

 

 

Iron

From a learning perspective, can you recommend a means for a newbie to detect when some of these problems you mention have occurred?  It isn't likely trace function in an in-circuit emulator will be in use or anything equipment that is expensive will be used in a learning environment.

Iron

Can you point us to the appoximation functions on your website that you mentioned (adapted from "Comptuer Appoximations, byt John Hart)?

Iron

very good pointers on code, thanks

good stuff. any recommendations for free/cheep pcb design software that does a great job of keeping maxwell's laws at bay?

I think the expensive people - like Mentor - have some.

Iron

temperature is a great tool to find marginal timing problems, try cool spray or heat.

Iron

Yes, assembly can help, though on some CPUs it's hard to beat the compiler. But assembly is expensive. DSP people often write the inner loop in ass'y.

 

Iron

Jack, can you please add the question to your answers?

Iron

Thanks you from quebec, canada

Iron

How many points should we have had on the first track?

Iron

Thankss for the session!

A Q re tools for measuring  time - I'll address this later in the week.

Iron

good stuff. any recommendations for free/cheep pcb design software that does a great job of keeping maxwell's laws at bay?

 

thanks, Jack. now i know i'm not a programmer. great session.

 

Iron

do tempeture affect timing very much?

 

great session .. thanks

Iron

Can speed be enhanced by writing some of the code in assembly? Is this even possible with advanced MCU products?

Thank you for a good session.

I see a q re XINU - There are a lot of RTOSes out there that are great, today. Some are safety-certifieabble.

 

Iron

Thanks for the lecture Jack - Very interesting.

 

Iron

Jack will now come onto the chat here and answer your questions directly

Blogger

Thank you. Great session.

Iron

great intro session. thanks alex and jack

Iron

Thank you for thiss session, it was very informative. Can't wait for tomorrow's session!

Iron

Great session. Thanks you much.

Iron

Great advice.  I don't do a lot of real time development but your impedance matching advice is overlooked in many technologies.  I also discovered that fluid flow has flow into the male and out the female fittings so the electrical signals also need to follow this pattern.

Iron

Maybe add slide numbering directly in the file.

Thanks Jack and all, great session again.

Iron

good insight from sw and hw perspectives. thanks!

Iron

Never did get any sound. Will have to try from home tomorrow.

Iron

Interesting tips, thank you!

Iron

Very good session, thanks!

Iron

I used to work at a place were the qa folks used to take alot of pleasure in

cutting a large paragraph of text and pasting into every little number entry

edit box to see what would happen

 

Thank you very much!! Great session!

What are your thoughts about the XINU project? Is it likely it will be a good condidate for custom real time OS embedded systems?

Iron

excelent session, thank you

 

Iron

Is there any tool toe valuate the execution time of various blocks of of the code while developing itself?

Iron

I get the impression system testing has two distinct components: state behavior and timing behavior,,

Comments?

it is called defensive coding.

 

Iron

Thank you for the presentation and for sharing your experiences in this forum. I look forward to hear you again in your next presentation.

not everyone is using the chat window. some are downloading the slide deck as directed above. it would be helpful to have the ppt slide pages to identify the page number though.

 

Iron

Question:  Can you give some good references for learning more about creating "C" implementations of complex computation, such as sin, cos, hyp tan, exp, etc.?  I've heard about CORDIC, but would love to target some good analysis, rather than read a bunch of "teaser" articles/books.  Thanks!  Interesting talk! 

Iron

Many thanks. great session.

Iron

how do you wait for a resource to become free again? I understand the handshake problem on slide 13, but I can't see a way around it right now.

Iron

Interesting thing is that folks who nowadays work with microelectronics they had to go back to school (real engineering) to learn microwave engineering. In the past and still today in engineering/techn ical schools, students want to skip all that "nightmare"

Iron

Thanks.  BTW: if anyone works where the audio stream is blocked and they have a smartphone they can get the audio via the smartphone while using their desktop for the slide deck and chat.

 

Iron

Thanks, Jack!  Solid techniques and recommendations.

Iron

> We can see the slide number in the chat window

> There is no need to anounce this

> FrankBishop

 

I completely agree.  The audio interruptions are counterproductive.


Great session Jack, thanks.

 

Iron

Thank you for the discussion Jack.

Iron

Great talk, very good tips. Thank you very much.

Iron

I wish to hear you tomorrow.

Iron

Thank you,  Jack for the session.

Iron

Great tips. Thanks!

 

Iron

On slide 3~5, the time does not depend on a compiler?

Iron

my military electronics education many years ago was great. we understood how the logic works, signal voltage, timimg and troubleshooting and scope picyures of good/bad

Iron

Have you done any work, or recommend anything using parallel processing for real time measurements, or other things?

Iron

Jack, can you please, give your opinion of the great and not so great things of QNX neutrino as a "hard real-time" or serious RTOS?

Iron

very interesting points - thanks for the presentation

Iron

Have you worked with TinyOS?  How does it compare to other real-time OSs?

thanks much - great slides and info

Iron

Some of you may call me crazy, but the way technical eduction is becoming watered down in the basic aspects of engineering siuch as absence of electromagnatism and measurement theory education, the reliability of electronic systems will be greatly challenged.

Iron

ALE address latch enable 8085 type sugnal

Iron

address latch enable

Iron

Thanks ceribeiro!

 

Iron

What does ALE stand for?

there is a software called winline (there are others equivalent), which will help you calculate the TL needed for your design

Iron

Would it be advisable to design the tracks on the board so that they were matching the input impedance or output impedance of the devices?

 

Iron

another books that you recommend?

Iron

How do you determine the Z of driven line?

I thought it was 0.35 instead of 0.5 on the top of the equation.

Iron

you need a transmission line for those fast edges

Iron

some "bible"  titles for slide 22 :

Right the First Time:  A Practical Handbook on High Speed PCB and System Design - Lee W. Ritchey
http://books.google.ca/books?id=YZpdOgAACAAJ&dq=right the first time&hl=en&sa=X&ei=DuomT_qrK6OqiQKuqN3SBw&ved=0CDIQ6AEwAA

Signal Iintegrity:  Simplified - Eric Bogatin
http://books.google.ca/books?id=_IiONSphoB4C&dq=right%20the%20first%20time&source=gbs_similarbooks

Iron

Yes I have gone through this book. Yes it is excellent and very practical

 

Iron

I actually enjoyed both semesters of Fields and Waves.

 

@jl: assume that pop_... does this

Iron

perhaps during the pop interrupt state

Iron

@jl: pop interrupt state will do that

Iron

slide 20? when do you enable interrupts. it seems to be missing.

Iron

@Jack Ganssle: why not use a 32-bit variable and update it from ISR

Iron

don't you take a risk to miss an irq ?

Hmm, I can neither hear any audio nor see any activity (slide-show in the browser).  Can open the stand-alone Power-Point, though.  Thanks for posting the page# of the slide in the chat area.

We can see the slide number in the chat window

There is no need to anounce this

Got the slides.  Thanks.

Iron
under Today's Slide Deck you will find the presentation.
Iron

skipping multiple slides? (we are already on 11)

Iron

> Do you have similar libraries

TI does provide them. usually your IDE will integrate these (like IAR)

 

How do I get the video?

I'm glad we dont have any video

I dont have the bandwidth to watch the video stop and buffer

for an hour

there is no video. follow along with the PPT, downloadable under "Special Ed Materials."

Blogger

Better to just see the slide updates here in the chat window

I can hear but I don't have video.  This is my first CEC class.  How do I get the video?

Iron

I have no problem figuring out what slide he is on, but the moderator interruptions are jarring.

 

I imagine a reentrant function is the same as a recursive function

Do you have similar libraries for recent Microcontrollers like TI / PIC?

Iron

http://www.ganssle.com/

Iron

Copies of the Hart book on alibris.com for as low as $34

 

can someone write the url here

can you post the URL, please?

Iron

186 is a "real computer"? I guess it doesn't qualify as a microcontroller...

what does "7.3 digits" mean in the context of numbers between 0 and 1?

Iron

i hear what u all are saying. Most people are having no probs and audio is fine. If you really can't hear or get the PPTs, this show will be available as an archive later today (if it's not working at work, try it at home tonight).

Blogger

WTF, I guess I will have to ask to my TI department enable audio streaming. Are there a spetial IP to enable and listen these classes?

 

Iron

slides 3-4 contain tables as embedded XLS object...

Iron

Chrome audio is fine also

 

Iron

The slides today for me are not good. slides 3, 4, don't even show anything.

Iron

No issues with audio in Firefox (behind a firewall)...

Iron

Shtu down the browser and restart didn't work either. Still no sound.

Iron

browser type, IE, Chrome, Firefox, PC/MAC? for audio problems?

Iron

Audio seems fine now

 

Iron

I hear it fine and my speakers are less than half volume

 

Iron

I had to shut down my browser and start it back up.

My volume is set to maiximum, but I still dom't hear anything. I have refreshed the page many times and logged out and back in.

Iron
I can't use my IPAD2 for this can I?
Iron

save the presentation, open in power point and have the browser open at the sign in page

Iron

some companies block live audio and video streams to limit bandwidth usage.

Blogger

I still cant hear anything, I refresh my browser, login again but nothing happens

Iron

we are on slide 2 now

Iron

Same here, loud and clear..

Iron

I have no audio last time and couldn't make it work, just wait until finish the lecture and enter again for the podcast-style.

Iron

Now, with the head phones, I hear the speaker.

Iron

Audio, loud and clear here.

sounds fine.  exactly like the previous sessions

Iron

Jack please mention the slide pages when you pass. Thanks

Iron

Make sure the PC volume is high.  I can hear it plenty loud.

 

Iron

tell people to put their volume to max

 

Iron

I had to reconnect because I lost the stream :-S

i can hear you good now

Iron

if u can't see the player, try refreshing your browser

 

Blogger

Your audio is fine here!

 

Iron

volume is load and clear here

Iron

Sounds fine to me, even before.

 

Iron

I still cannot hear anything even though I logged out and back in.

 

Iron

I can hear but it is too quiet. Please speak up!

Iron

5 points for interacting. No further questions.

Iron

I don't have a blocker on and still no sound

I have logged in 3 ties

 

 

Iron

Hi, Jack and Alex. I can't hear too well.

Iron

F5 for sound it worked for me.

Iron

Audio working fine here

 

Alven: u should log in again

Iron

Avoid any browser element blocker.

I have no sound!! any help?

 

Iron
I still have no audio
Iron

Log in again to get sound

Iron

for sound , try F5 (refresh)

Iron

Hello All! The audio seems to be working fine...

Iron

I have no sound yet. Should I?

Iron

Good...  We have audio!

Iron

Greetings from Winston-Salem, NC!

Iron

Question from last class:

Q: how can u get 5a from 7805?

A: put a resistor around 68 ohm to input th LM 7805. Conect Emiter of a PNP transistor to left side the resistor, then Bese to right side of resistor or regulator input. And colector to output of regulator. Pass around 100 mA throuth the resistor causes 0.7 v drop the on resistor and also emitter- base of trsnsistro. Result, any current pulling from regulator will be pass from transistor ont regulator. Up to 5 A you an pull regulated 5 v from this circuit.

Iron

Hello, looking forward to this weeks sessions.

Iron

Hi Everybody! Good to be back again...

Iron

Hi there from Canada

Iron

Good morning/afternoon/evening  everyone

Iron

sorry... Huntron Tracker.

old fingers - new keyboard

Iron

The speed kills slides reminds me of "real time" troubleshooting challenges. Static testing with a logic probe may not see the problem, scope may look "OK". I found that looking through the analog world with a Huntron Trackerf worked for real world speed problems with wounded chips and damaged terminators.

Iron

Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

The streaming audio player will appear on this web page when the show starts at 2pm eastern today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser.

Blogger

@Jack - any info on the cost of "Micro Digital's GoFast" ?  Their website is slick but deliberately omits pricing.  Leads me to believe it is very expensive.

Thx.

 

Iron

@simona - The chat will appear right here as you've written.  The radio player will open up on this page at the set time for the show.  In advance of the show you can download Today's Slide Deck to follow along with the lecturer.   We look forward to chatting with you right here!

Iron

I have a problem. I cannot see any chat here

Iron


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Reshoring is picking up steam, but it's not outpacing the overall continuing growth in outsourcing.
Here's a variety of views into the complex production processes at Santa's factory. Happy Holidays!
The Beam Store from Suitable Technologies is managed by remote workers from places as diverse as New York and Sydney, Australia. Employees attend to store visitors through Beam Smart Presence Systems (SPSs) from the company. The systems combine mobility and video conferencing and allow people to communicate directly from a remote location via a screen as well as move around as if they are actually in the room.
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