Author Topic: EEVblog #711 - Mailbag  (Read 21461 times)

0 Members and 1 Guest are viewing this topic.

Offline EEVblog

  • Administrator
  • *****
  • Posts: 32070
  • Country: au
    • EEVblog
EEVblog #711 - Mailbag
« on: February 03, 2015, 12:48:57 pm »
Mailbag time.


SPOILERS:
Making of the Atomic Bomb: http://amzn.to/1CUMscY

The Bruces Monty Python Sketch:


Ideal diode (synchronous rectifier) datasheet: http://www.linear.com/product/LT4320

Car ECU teardown
PAL to RGBS converter teardown
Pump controller teardown

Meet Edison Educational Robot: http://meetedison.com/

Casio FX790P scientific calculator pocket computer: http://www.rskey.org/CMS/index.php/7?manufacturer=Casio&model=FX-790P

PAL/NTSC decoder: http://pdf.datasheetcatalog.com/datasheet/philips/TDA3566A.pdf

Digikey ChipKIT WF32 https://www.digilentinc.com/Products/Detail.cfm?NavPath=2,892,1193&Prod=CHIPKIT-WF32

Basys 3 Artix-7 FPGA Demo Board
https://www.digilentinc.com/Products/Detail.cfm?NavPath=2,400,1288&Prod=BASYS3


 

Offline R_Gtx

  • Regular Contributor
  • *
  • Posts: 52
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #1 on: February 03, 2015, 02:04:29 pm »
I don't know what IGBTs or MOSFETs are restricted, but you could attempt purchasing a krytron through ebay.
 

Offline SL4P

  • Super Contributor
  • ***
  • Posts: 2154
  • Country: au
  • There's more value if you figure it out yourself!
Re: EEVblog #711 - Mailbag
« Reply #2 on: February 03, 2015, 03:19:38 pm »
When I saw the contents of this week's video - I had to do a double take - and looked back in my mind to find a very similar book written 45 YEARS ago - which I vividly remember as one of the most interesting accounts of the A-Bomb development...

The History Of The Atomic Bomb, by Michael Blow

From the reviews, it still seems to hold its place in many libraries!

http://www.goodreads.com/book/show/11317555-the-history-of-the-atomic-bomb
http://www.amazon.ca/History-Atomic-Bomb-Michael-Blow/dp/0060201274
Don't ask a question if you aren't willing to listen to the answer.
 

Offline FHR

  • Contributor
  • Posts: 20
  • Country: cz
  • I love Linux
    • FHRNet.eu
Re: EEVblog #711 - Mailbag
« Reply #3 on: February 03, 2015, 03:38:17 pm »
Hi Dave,

Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board http://www.supermicro.nl/products/motherboard/Xeon/C600/X9DAi.cfm.
It has all the features you need - It supports DDR3 non-ECC RAMs, has a sound card, has SATA III/6Gbps, has 3 16x PCI-E slots.

Your power supply is enough to power this thing, you do not need a new one. However, you need a reduction from Molex to 4/8pin CPU power connector. Those boards require 2 4/8pin CPU power connectors, your power supply only has one (like 99% of desktop power supplies). Also check that you can fit the board into your chassis.

TO-BUY list if you choose this board:
  • Motherboard (obviously  ;))
  • Molex to 4/8 pin CPU (something like this http://www.directron.com/ad202.html)
  • Possibly a new chassis. Depends if you can fit the EATX board into your chassis.
  • CPU Coolers
« Last Edit: February 03, 2015, 07:01:04 pm by FHR »
 

Offline Porto

  • Contributor
  • Posts: 36
  • Country: nl
Re: EEVblog #711 - Mailbag
« Reply #4 on: February 03, 2015, 04:29:50 pm »
Had this Casio FX790P programmable computer/calculator in school more than 20 years ago, bought from Tandy.
Programmed a few little but quite neat programs with it in Basic.
Also own the cute little thermal printer that came with the deal.

Unfortunately it broke down on me some years after (flatcable between the two halves is VERY sensitive) and is now lying in multiple pieces waiting for a, long forgotten, repair.  :-[
« Last Edit: February 03, 2015, 04:33:33 pm by Porto »
 

Offline gardner

  • Regular Contributor
  • *
  • Posts: 124
  • Country: ca
Re: EEVblog #711 - Mailbag
« Reply #5 on: February 03, 2015, 05:23:06 pm »
One of my favourite reads on nuclear weapons history is this:

http://blog.nuclearsecrecy.com/

Quote
Restricted Data is a blog about nuclear secrecy, past and present, run by Alex Wellerstein, a historian of science at the Stevens Institute of Technology.

A really interesting perspective from a talented researcher.
--- Gardner
 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: EEVblog #711 - Mailbag
« Reply #6 on: February 03, 2015, 05:26:16 pm »
Re: Vibration resistance of SIP components in the Subaru ECU.

I suspect that the module was made to mount vertically (like on the firewall, etc.) and with the two big tabs on either side, so the giant connector is at the bottom.
In this orientation, note that all the SIP components/modules are vertical, so the majority of vibration will be vertical also (from bumpy roads, etc.) 
I suspect this wasn't by accident that they are all vertical.  Maybe even those can radial electrolytics have their pins arranged in that orientation as well.
 

Offline German_EE

  • Super Contributor
  • ***
  • Posts: 2400
  • Country: de
Re: EEVblog #711 - Mailbag
« Reply #7 on: February 03, 2015, 07:31:48 pm »
Dave, as you like nuclear history the following YouTube channel may be of interest.

https://www.youtube.com/user/atomcentral
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

Warren Buffett
 

Offline hikariuk

  • Supporter
  • ****
  • Posts: 206
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #8 on: February 03, 2015, 08:03:30 pm »
O Level sounds distinctly like a vestige of British colonial rule; we used to have O Levels (at 16) and A Levels (at 18).
I write software.  I'd far rather be doing something else.
 

Offline rsjsouza

  • Super Contributor
  • ***
  • Posts: 4110
  • Country: us
  • Eternally curious
    • Vbe - vídeo blog eletrônico
Re: EEVblog #711 - Mailbag
« Reply #9 on: February 03, 2015, 08:11:27 pm »
Dave, as I commented in the past Amp Hour:
Quote from: TheAmpHour comment section
Dave, for nuclear age aficionados, check out also a good book about “the other side”: Stalin and the bomb. http://www.amazon.com/Stalin-Bomb-Soviet-Atomic-1939-1956/dp/0300066643
Vbe - vídeo blog eletrônico http://videos.vbeletronico.com

Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Offline max666

  • Frequent Contributor
  • **
  • Posts: 367
  • Country: at
Re: EEVblog #711 - Mailbag
« Reply #10 on: February 03, 2015, 09:20:12 pm »
I don't understand why you would call someone "not a proper pcb designer", because of old school square routing, Dave.  :/
 

Offline senso

  • Frequent Contributor
  • **
  • Posts: 951
  • Country: pt
    • My AVR tutorials
Re: EEVblog #711 - Mailbag
« Reply #11 on: February 03, 2015, 09:22:30 pm »
It might even be a software limitation, I have redrawn pcb's for Bosch made in the 80's that where all square routing and they demanded that I kept the square routing, low speed signals, what's the problem with not having 45º corners?
All the electrons will crash in the turn?
 

Offline max_torque

  • Super Contributor
  • ***
  • Posts: 1164
  • Country: gb
    • bitdynamics
Re: EEVblog #711 - Mailbag
« Reply #12 on: February 03, 2015, 09:44:49 pm »
Re: Vibration resistance of SIP components in the Subaru ECU.

I suspect that the module was made to mount vertically (like on the firewall, etc.) and with the two big tabs on either side, so the giant connector is at the bottom.
In this orientation, note that all the SIP components/modules are vertical, so the majority of vibration will be vertical also (from bumpy roads, etc.) 
I suspect this wasn't by accident that they are all vertical.  Maybe even those can radial electrolytics have their pins arranged in that orientation as well.

It's also worth noting that engine controllers from this era, were mounted in the vehicles main cabin, rather than underbonnet, and hence have a much lower requirement for environmental sealing and vibration resistance.  (being bolted to a ton of body shell automatically limits the peak operating g the unit can undergo!)  Modern units are now underbonnet or even engine mounted to reduce the wiring loom cost and improve the engine integration aspect where one engine family is used across multiple platforms.

Modern devices are entirely SMC and use drivers in packages like  SOIC-PowerSO with a large soldered tag underneath for heat sinking and mechanical security:

For example here is an early 2000's EDC17 Bosch ecu:
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 32070
  • Country: au
    • EEVblog
Re: EEVblog #711 - Mailbag
« Reply #13 on: February 03, 2015, 09:51:54 pm »
Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board http://www.supermicro.nl/products/motherboard/Xeon/C600/X9DAi.cfm.
It has all the features you need - It supports DDR3 non-ECC RAMs, has a sound card, has SATA III/6Gbps, has 3 16x PCI-E slots.

Someone has kindly donated one of these boards ( I can pick):
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRL-EF.cfm
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DAE.cfm
http://www.supermicro.com.tw/index.cfm
http://www.intel.com/content/www/us/en/motherboards/server-motherboards/server-board-s2600cp.html
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 32070
  • Country: au
    • EEVblog
Re: EEVblog #711 - Mailbag
« Reply #14 on: February 03, 2015, 09:53:47 pm »
being bolted to a ton of body shell automatically limits the peak operating g the unit can undergo!

Yes, it wouldn't be about peak G's, it would be about hitting resonant frequencies of free standing packages from broadband vibration.
I've seen free standing TO-220 packages vibrate clean off from just wheeling up and down a production floor for a few weeks on a metal trolley.
 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: EEVblog #711 - Mailbag
« Reply #15 on: February 03, 2015, 10:42:21 pm »
Yes, it wouldn't be about peak G's, it would be about hitting resonant frequencies of free standing packages from broadband vibration.
I've seen free standing TO-220 packages vibrate clean off from just wheeling up and down a production floor for a few weeks on a metal trolley.
And that TO-220 device is mounted "horizontally" which would make it MORE vulnerable to vertical vibration.
The pin pattern was in a triangle, but the leads were formed to that everything above the surface of the PC board was parallel.
It would probably be speculative to assume they designed it that way so that the springiness of the leads absorbed the vibration from the mass of the package.....
I was also very surprised it wasn't conformally coated. But if it was designed to go inside the passenger compartment, that might explain it.
 

Offline necessaryevil

  • Regular Contributor
  • *
  • Posts: 131
  • Country: nl
Re: EEVblog #711 - Mailbag
« Reply #16 on: February 03, 2015, 11:08:26 pm »
Had this Casio FX790P programmable computer/calculator in school more than 20 years ago, bought from Tandy.
GeI was the one who sent it in. It used to belong to my dad, he wanted to throw it away but I told him I knew somebody who collects calculators. I showed him the video; he was convinced that his one was a bit different than the one in the video - until I told him I send Dave the calculator.

The calculator was bought in Singapore by my uncle who was on his way to Australia (or came back). The calculator has been all over the world! By the way, I know that the Australian import/export rules are strict, that is why I didn't include the batteries, just to be sure.


And about the rectifier: yes, each pair of mosfet rectifiers face the same way because I intended use of a heat sink. If a heat sink is actually necessary depends on the current drawn and on the mosfets. The major source of heat will be originate from conduction losses, so the Rds(on) is the most important parameter. Just if someone wants to know!

 

Offline synapsis

  • Regular Contributor
  • *
  • Posts: 140
  • Country: us
    • Blackcow
Re: EEVblog #711 - Mailbag
« Reply #17 on: February 03, 2015, 11:44:40 pm »
I had to pause the video and order the Atomic Bomb book.

Another good book if you're also interested in photography is "How to Photograph an Atomic Bomb."

http://www.unitednuclear.com/index.php?main_page=product_info&cPath=29_58&products_id=442

I picked mine up at the Titan Missile Museum here in Tucson. Great place to visit if you're interested in that kinda stuff. You go down into the silo, the control room, the support areas, etc...
 

Offline mattinx

  • Contributor
  • Posts: 7
Re: EEVblog #711 - Mailbag
« Reply #18 on: February 04, 2015, 12:27:41 am »
Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board http://www.supermicro.nl/products/motherboard/Xeon/C600/X9DAi.cfm.

I'll second that SuperMicro recommendation - we build quite a few systems round that platform, the X9DR3-LN4F is our preferred board, but we're typically looking at it from an IO standpoint.

Trap for young players - remember to check what warranty you have on the board - the 3 year warranty is an optional extra.
 

Offline Dongulus

  • Regular Contributor
  • *
  • Posts: 231
  • Country: us
Re: EEVblog #711 - Mailbag
« Reply #19 on: February 04, 2015, 02:55:14 am »
I was hoping that the package from Digilent had a Zybo instead of the Basys 3. I've been wanting to play around with the Zynq 7000 SoC and I've been eyeing the Zybo because it seems to be the cheapest dev board for the Zynq. I've also been looking at the Altera Cyclone V SoC development board from Terasic which seems to be a bit more bang for the buck.
 

Offline EEVblog

  • Administrator
  • *****
  • Posts: 32070
  • Country: au
    • EEVblog
Re: EEVblog #711 - Mailbag
« Reply #20 on: February 04, 2015, 03:03:55 am »
When you do the video on the Digilent board can you consider the question of why you might consider the new chip over the old? From a beginner learning POV. I know the new one would be faster and better for new design work, but if you wanted to buy a second hand one, should you?

If you just want to learn FPGA's, makes no difference at all.
 

Offline urbis

  • Supporter
  • ****
  • Posts: 312
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #21 on: February 04, 2015, 08:44:12 am »
I see my item in the background, at least I know it arrived safely!  O0
 

Offline jancumps

  • Supporter
  • ****
  • Posts: 1250
  • Country: be
  • New Low
Re: EEVblog #711 - Mailbag
« Reply #22 on: February 04, 2015, 09:48:09 am »
When you do the video on the Digilent board can you consider the question of why you might consider the new chip over the old? From a beginner learning POV. I know the new one would be faster and better for new design work, but if you wanted to buy a second hand one, should you?

If you just want to learn FPGA's, makes no difference at all.

The only difference for the Digilent boards is that the new one is supported by their new IDE.
The ones with Spartan 6 and older FPGAs are not supported.
You need the Xilinx ISE development environment for them.
It's a good and capable IDE, but active development has ended.
it's still supported by Xilinx.
 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #23 on: February 04, 2015, 03:09:32 pm »
Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board

Someone has kindly donated one of these boards ( I can pick):
...

I was going to suggest a cheaper way of getting more cores for video rendering than using Xeons but if people are donating the CPUs and motherboards then I guess there's not much point.   :-//
 

Online Monkeh

  • Super Contributor
  • ***
  • Posts: 6669
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #24 on: February 04, 2015, 06:06:29 pm »
Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board http://www.supermicro.nl/products/motherboard/Xeon/C600/X9DAi.cfm.
It has all the features you need - It supports DDR3 non-ECC RAMs, has a sound card, has SATA III/6Gbps, has 3 16x PCI-E slots.

Someone has kindly donated one of these boards ( I can pick):
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRL-EF.cfm
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DAE.cfm
http://www.supermicro.com.tw/index.cfm
http://www.intel.com/content/www/us/en/motherboards/server-motherboards/server-board-s2600cp.html

The Intel one supports significantly superior processors, but may not fit a normal case.
 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: EEVblog #711 - Mailbag
« Reply #25 on: February 04, 2015, 06:55:07 pm »
The Intel one supports significantly superior processors, but may not fit a normal case.
Yeah, that Intel board is clearly a SERVER board and is substantially bigger than any of the traditional client MB form-factors.
What happened to those servers Dave got out of the dumpster?  Are they already gone?
 

Online Monkeh

  • Super Contributor
  • ***
  • Posts: 6669
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #26 on: February 04, 2015, 07:05:13 pm »
The Intel one supports significantly superior processors, but may not fit a normal case.
Yeah, that Intel board is clearly a SERVER board and is substantially bigger than any of the traditional client MB form-factors.
What happened to those servers Dave got out of the dumpster?  Are they already gone?

So are the two Supermicro boards. One of them is E-ATX, which has the same dimensions as the Intel board.
 

Offline max_torque

  • Super Contributor
  • ***
  • Posts: 1164
  • Country: gb
    • bitdynamics
Re: EEVblog #711 - Mailbag
« Reply #27 on: February 04, 2015, 11:28:57 pm »
being bolted to a ton of body shell automatically limits the peak operating g the unit can undergo!

Yes, it wouldn't be about peak G's, it would be about hitting resonant frequencies of free standing packages from broadband vibration.
I've seen free standing TO-220 packages vibrate clean off from just wheeling up and down a production floor for a few weeks on a metal trolley.

But that is exactly the point, there isn't any! (well very little) because the mass of the body shell damps it so effectively.  Chances are, those SIL leaded components have resonant frequencies in the hundreds of Hz range.  Now calculate the power required to say vibrate even 20kg of steel body shell at just 100Hz. It's massive!
 Ok, mistakes have been made, people have bolted control units to flat panels that pant or suffer a critical oscillation from drivetrain driven resonance, but generally speaking it doesn't happen as modern car are so well designed/tested (not to mention the NVH aspect of having parts of your bodyinwhite vibrate at 100hz). The primary ride frequency of a typical passenger car is in the order of 1 or 2Hz, and most of the accoustic noise is extremely low amplitude at say >1000Hz, that noise won't even make it through the pcb, let alone snap components off it!

(In fact, the only time i can actually remember an issue with a control unit failing was on a rally car, where the control unit had been mounted on rubber, vibration absorbing "bobins" in a misguided attempt to reduce transmitted vibrations.  What actually happened is that those rubber mounts, in conjunction with the mass of the control unit forms a critically tuned spring/mass oscillator at around 10Hz, which for a competition car IS in the normal ride frequency region.  As a result, there were some failures of some large through hole capacitors on a few units.  When we removed the rubber compliance, bolted the control unit directly to the bodyinwhite, all was well! ;-)
 

Offline FHR

  • Contributor
  • Posts: 20
  • Country: cz
  • I love Linux
    • FHRNet.eu
Re: EEVblog #711 - Mailbag
« Reply #28 on: February 05, 2015, 03:24:02 pm »
Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board http://www.supermicro.nl/products/motherboard/Xeon/C600/X9DAi.cfm.
It has all the features you need - It supports DDR3 non-ECC RAMs, has a sound card, has SATA III/6Gbps, has 3 16x PCI-E slots.

Someone has kindly donated one of these boards ( I can pick):
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRL-EF.cfm
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DAE.cfm
http://www.supermicro.com.tw/index.cfm
http://www.intel.com/content/www/us/en/motherboards/server-motherboards/server-board-s2600cp.html

The X9DAE is the one to pick. You need a workstation board, not a server one. These other boards you mentioned don't even have a sound card.
 

Online Monkeh

  • Super Contributor
  • ***
  • Posts: 6669
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #29 on: February 05, 2015, 04:36:30 pm »
Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board http://www.supermicro.nl/products/motherboard/Xeon/C600/X9DAi.cfm.
It has all the features you need - It supports DDR3 non-ECC RAMs, has a sound card, has SATA III/6Gbps, has 3 16x PCI-E slots.

Someone has kindly donated one of these boards ( I can pick):
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRL-EF.cfm
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DAE.cfm
http://www.supermicro.com.tw/index.cfm
http://www.intel.com/content/www/us/en/motherboards/server-motherboards/server-board-s2600cp.html

The X9DAE is the one to pick. You need a workstation board, not a server one. These other boards you mentioned don't even have a sound card.

You can get proper soundcards instead of onboard crap, you know. Lack of onboard audio is not exactly a dealbreaker on a board with six PCI-E slots.
 

Offline FHR

  • Contributor
  • Posts: 20
  • Country: cz
  • I love Linux
    • FHRNet.eu
Re: EEVblog #711 - Mailbag
« Reply #30 on: February 05, 2015, 04:46:02 pm »
Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board http://www.supermicro.nl/products/motherboard/Xeon/C600/X9DAi.cfm.
It has all the features you need - It supports DDR3 non-ECC RAMs, has a sound card, has SATA III/6Gbps, has 3 16x PCI-E slots.

Someone has kindly donated one of these boards ( I can pick):
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRL-EF.cfm
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DAE.cfm
http://www.supermicro.com.tw/index.cfm
http://www.intel.com/content/www/us/en/motherboards/server-motherboards/server-board-s2600cp.html

The X9DAE is the one to pick. You need a workstation board, not a server one. These other boards you mentioned don't even have a sound card.

You can get proper soundcards instead of onboard crap, you know. Lack of onboard audio is not exactly a dealbreaker on a board with six PCI-E slots.

But does he really need to? He said he will use it as a rendering and editing machine. Not his home machine. Also, for most (normal) people are onboard sound cards ok. If he would play games on it - yes, buy a sound card. Use it for listening to music with headphone priced 300$? Yes, buy a sound card. For video editing it's perfectly fine.


Besides as I said, those other boards are for SERVER use, not for WORKSTATION use. There are more things, that server boards lack besides sound card. Support for SLI, sometimes Fan regulation. Server boards also have a lot less desktop-use connectivity options. I'm talking about USB 3.0, Firewire, etc.
 

Online Monkeh

  • Super Contributor
  • ***
  • Posts: 6669
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #31 on: February 05, 2015, 04:55:26 pm »
But does he really need to? He said he will use it as a rendering and editing machine. Not his home machine. Also, for most (normal) people are onboard sound cards ok. If he would play games on it - yes, buy a sound card. Use it for listening to music with headphone priced 300$? Yes, buy a sound card. For video editing it's perfectly fine.

You don't need a soundcard for playing games!

Quote
Besides as I said, those other boards are for SERVER use, not for WORKSTATION use. There are more things, that server boards lack besides sound card. Support for SLI, sometimes Fan regulation. Server boards also have a lot less desktop-use connectivity options. I'm talking about USB 3.0, Firewire, etc.

SLI is irrelevant. Fan regulation is a potential but unlikely concern. USB 3 is easily added, Firewire is rarely provided anymore anyway. All acceptable losses to get Haswell instead of Ivy Bridge!

E: Hang on, that Intel board said v3 compatibility yesterday, and v2 today. Okay, in that case you're right, the X9DAE is the one to pick.
 

Offline FHR

  • Contributor
  • Posts: 20
  • Country: cz
  • I love Linux
    • FHRNet.eu
Re: EEVblog #711 - Mailbag
« Reply #32 on: February 05, 2015, 05:01:48 pm »

SLI is irrelevant. Fan regulation is a potential but unlikely concern. USB 3 is easily added, Firewire is rarely provided anymore anyway. All acceptable losses to get Haswell instead of Ivy Bridge!

E: Hang on, that Intel board said v3 compatibility yesterday, and v2 today. Okay, in that case you're right, the X9DAE is the one to pick.

The CPUs (SR1AM; E5-2630v2) are Ivy Bridge-EP's anyway. v3 also means DDR4 RAM => he would have to buy a new RAM. I'm not sure the CPU's would be compatible anyway, even if they are the same socket. Intel likes to mess with those things that they are not always backwards/forwards compatible.
 

Online Monkeh

  • Super Contributor
  • ***
  • Posts: 6669
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #33 on: February 05, 2015, 05:03:06 pm »

SLI is irrelevant. Fan regulation is a potential but unlikely concern. USB 3 is easily added, Firewire is rarely provided anymore anyway. All acceptable losses to get Haswell instead of Ivy Bridge!

E: Hang on, that Intel board said v3 compatibility yesterday, and v2 today. Okay, in that case you're right, the X9DAE is the one to pick.

The CPUs (SR1AM; E5-2630v2) are Ivy Bridge-EP's anyway. v3 also means DDR4 RAM => he would have to buy a new RAM. I'm not sure the CPU's would be compatible anyway, even if they are the same socket. Intel likes to mess with those things that they are not always backwards/forwards compatible.

I was not aware CPUs were already acquired.
 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #34 on: February 05, 2015, 05:28:39 pm »
I was not aware CPUs were already acquired.

Hint: They're in the video...

 

Online Monkeh

  • Super Contributor
  • ***
  • Posts: 6669
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #35 on: February 05, 2015, 05:30:31 pm »
I was not aware CPUs were already acquired.

Hint: They're in the video...

And not mentioned in any description. Nothing in the description of the video interested me, so I haven't used any of my free time to watch it as of yet. It's a shocking thing, I know, not spending every minute of my life keeping up to date with other people's lives..
 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #36 on: February 05, 2015, 05:52:40 pm »
I was not aware CPUs were already acquired.

Hint: They're in the video...

And not mentioned in any description.

Is there a description? The things above the video are only links to items in the video so you can follow up on them.

Would you have watched it if he'd put a link to Intel's Xeon CPU page?

Intel Xeon CPUs: http://www.intel.com/Xeons...

It's a shocking thing, I know, not spending every minute of my life keeping up to date with other people's lives..

But you do have time to comment on videos that you haven't even watched...?  :-//
 

Online Monkeh

  • Super Contributor
  • ***
  • Posts: 6669
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #37 on: February 05, 2015, 05:54:27 pm »
Would you have watched it if he'd put a link to Intel's Xeon CPU page?

I'd have known there was something about CPUs in it..

Quote
It's a shocking thing, I know, not spending every minute of my life keeping up to date with other people's lives..

But you do have time to comment on videos that you haven't even watched...?  :-//

I haven't made any comments about the video, now have I?

This takes seconds to type, the video requires 40 minutes of my attention..
 

Offline hikariuk

  • Supporter
  • ****
  • Posts: 206
  • Country: gb
Re: EEVblog #711 - Mailbag
« Reply #38 on: February 05, 2015, 07:04:03 pm »
Regarding the motherboard you will need for those 2 new Xeons, I recommend you the Supermicro X9DAi board http://www.supermicro.nl/products/motherboard/Xeon/C600/X9DAi.cfm.
It has all the features you need - It supports DDR3 non-ECC RAMs, has a sound card, has SATA III/6Gbps, has 3 16x PCI-E slots.

Someone has kindly donated one of these boards ( I can pick):
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DRL-EF.cfm
http://www.supermicro.com/products/motherboard/Xeon/C600/X9DAE.cfm
http://www.supermicro.com.tw/index.cfm
http://www.intel.com/content/www/us/en/motherboards/server-motherboards/server-board-s2600cp.html

The X9DAE is the one to pick. You need a workstation board, not a server one. These other boards you mentioned don't even have a sound card.

You can get proper soundcards instead of onboard crap, you know. Lack of onboard audio is not exactly a dealbreaker on a board with six PCI-E slots.

Tangenting wildly, however: onboard sound cards are fine for pretty much everyone.  Anyone who actually needs to give a shit about audio probably just uses an external DAC anyway.

I write software.  I'd far rather be doing something else.
 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #39 on: February 05, 2015, 07:41:20 pm »
Tangenting wildly, however: onboard sound cards are fine for pretty much everyone.  Anyone who actually needs to give a shit about audio probably just uses an external DAC anyway.

Yep.

And you can get a good one for about $12 on eBay so it's not even worth quibbling over, just get one...

(eBay search term: "pcm2704")
 

Offline RupertGo

  • Regular Contributor
  • *
  • Posts: 77
Re: EEVblog #711 - Mailbag
« Reply #40 on: February 06, 2015, 11:26:13 am »
And you can get a no-name audio dongle for a couple of quid. I have one here that I bought for random amateur radio faffery, now using it as my main audio ouput device on the microsever that happens to be my current work PC. I've done some quite intensive listening/input tests on it through Sennheisers that cost more than the server, comparing it to a variety of other sources/inputs, and damned if I can tell the difference even on 'audiophiie' material and a decent mic I use for broadcast work.

I take a particularly perverse delight in playing Neil Young through it.

(as part of this completely unscientific testing, I bunged the scope across the output of a £20 TA2020-based amp. My lord, but that was shocking - enough RF to light up the ionosphere. Still sounded excellent...)

 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #41 on: February 06, 2015, 11:57:45 am »
Going the other way around... anybody know of a decent, cheapo USB device for microphone input?

(One with manual adjustment of the input level, obviously...)

 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: EEVblog #711 - Mailbag
« Reply #42 on: February 06, 2015, 12:27:38 pm »
Going the other way around... anybody know of a decent, cheapo USB device for microphone input?
(One with manual adjustment of the input level, obviously...)
What does "cheapo" mean?  Can you put some numbers to that?
Do you mean a "pro" XLR microphone?  Or a 3.5mm consumer job?
If XLR, do you need phantom power for the microphone (e.g. a condenser mic)?
Or are you talking about a dynamic mic or a condenser mic with its own battery?
If you are talking about 3.5mm input, does the mic require "plug-in power"?
Or is it self-powered?
When you say "manual adjustment" do you mean a physical knob?
Or do you mean a software adjustment?
Do you need low-latency monitoring (as for multi-tracking musical performance)?
Or is this just for basic and simple one-off recording?
Is this for portable use out in the field?  Or a fixed installation at home/office?
 

Offline FHR

  • Contributor
  • Posts: 20
  • Country: cz
  • I love Linux
    • FHRNet.eu
Re: EEVblog #711 - Mailbag
« Reply #43 on: February 06, 2015, 01:37:42 pm »
Going the other way around... anybody know of a decent, cheapo USB device for microphone input?

(One with manual adjustment of the input level, obviously...)

I use a bigger brother of this, the Q1202USB one and it is absolutely great.
 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #44 on: February 06, 2015, 05:04:16 pm »
Going the other way around... anybody know of a decent, cheapo USB device for microphone input?
(One with manual adjustment of the input level, obviously...)
What does "cheapo" mean?  Can you put some numbers to that?

If I can get a decent $12 DAC then I don't see why a mic input device good enough for voice recording should cost much more than that.

Do you mean a "pro" XLR microphone?  Or a 3.5mm consumer job?
If XLR, do you need phantom power for the microphone (e.g. a condenser mic)?
Or are you talking about a dynamic mic or a condenser mic with its own battery?
If you are talking about 3.5mm input, does the mic require "plug-in power"?
Or is it self-powered?

:-)

This: http://www.audio-technica.com/cms/wired_mics/9c6eca17168eef6f/

Battery powered condenser mike with 3.5mm jack plug.


Is this for portable use out in the field?  Or a fixed installation at home/office?

This is for PC screen-recording with voice-over.

(I can connect it to the camera if I'm out somewhere recording video....)

 

Offline ornea

  • Supporter
  • ****
  • Posts: 119
  • Country: au
Re: EEVblog #711 - Mailbag
« Reply #45 on: February 06, 2015, 05:55:37 pm »
Curious if your studio lights were messing with Edison's collision avoidance sensors.
 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
Re: EEVblog #711 - Mailbag
« Reply #46 on: February 06, 2015, 06:00:36 pm »
You can probably plug that microphone directly into your computer. Why do you need an external interface>
 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #47 on: February 06, 2015, 06:13:17 pm »
I've been digging around eBay and there doesn't seem to be much choice. I guess there isn't as much demand as there is for audio DACs.

This looks reasonably close to what I'm after: http://www.ebay.com/itm/360959008656

It's based on this chip: http://www.cmedia.com.tw/productsdetail/page-p/c1serno-25/c2serno-26/pserno-7.html

It actually has a datasheet!

$7 seems a bit cheap but really it's just an IC embedded in a cable so how much should it be?

 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #48 on: February 06, 2015, 06:14:17 pm »
You can probably plug that microphone directly into your computer. Why do you need an external interface>

For the same reason I don't plug my headphones directly into the computer - the sound is as noisy as hell compared to my external DAC.

« Last Edit: February 06, 2015, 06:15:52 pm by Fungus »
 

Offline Richard Crowley

  • Super Contributor
  • ***
  • Posts: 4310
  • Country: us
  • KE7GKP
 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #50 on: February 06, 2015, 06:52:59 pm »
I've got one of these external boxes:

http://www.ebay.com/itm/221681003044

It's USB and has headphone, mic, line in/out, SPDIF, etc. but it's absolute garbage. I can't believe they cost about $90 new. I can actually plug a pair of headphones into it and go around the room finding RF interference hotspots with the buzz it produces. It's really sensitive/directional for that usage scenario but not really what you want in a sound card.   :palm:  It also has an incredibly bright blue LED on it that flashes when it's receiving audio - absolutely useless in a dark room  :palm: :palm:

Maybe I should send it to Dave for a teardown and laugh.

(or maybe I could try and get $25 for it on eBay)

I swear I'll never buy another Creative Labs product as long as I live. I once bought some of their "THX certified" desktop speakers because all the PC magazines were going crazy giving them gold stars that month. The sound was so bad I actually felt guilty about selling them on eBay the next day in case a musician bought them or something. It doesn't give much confidence in PC magazine audio reviews either.

PS: I can put my cheapo PCM2704 DAC right next to the WiFi router and it's completely OK (presumably because it's in a metal case).

The PCM2704 also has about 8db more dynamic range than the AD1825 used in that SoundBlaster - winner, winner, chicken dinner!

 

Online Fungus

  • Super Contributor
  • ***
  • Posts: 11263
  • Country: 00
Re: EEVblog #711 - Mailbag
« Reply #51 on: February 06, 2015, 06:58:32 pm »
http://www.audio-technica.com/cms/accessories/de806038b48c13d7/

Hey, cool!

I'm a bit of a fan of Audio Technica (I use their Headphones, etc.)

I wonder where I could buy one of those...
 

Offline f4eru

  • Frequent Contributor
  • **
  • Posts: 651
  • Country: 00
    • Chargehanger
Re: EEVblog #711 - Mailbag
« Reply #52 on: February 10, 2015, 12:09:12 am »
Dave, the glass-piezo delay line is for PAL, coz PAL combines two lines to average out color info ( phase changes, so the error cancels)

http://en.wikipedia.org/wiki/PAL#Colour_encoding

For the car ECU, it's really old school and robust.
These DIP packages are OK, and the whole thing is properly tested on big shakers, so no worries.

I'm much more worried with modern ECUs, which more and more have BGA packages. These ones can fail badly.

I've seen relays and caps hot snotted in a body controller (approx 5 million /year produced) the material was carefully chosen for the temp range, the dispensing automatic and the design validated, so it was OK :)

Offline rgammans

  • Contributor
  • Posts: 8
Re: EEVblog #711 - Mailbag
« Reply #53 on: February 10, 2015, 09:53:21 pm »
I wonder if the two mods Dave showed on the PAL decoder where 'end user' mods - rather than manufacturer mods.

The R+C between Sync + Green looks like the classic trick to add Sync on Green output to a device which doesn't already have it.

I wonder if the CMOS logic was some sort of Sync combiner/separator too. Many monitors of the period could be quite set in their ways about the type of sync they got.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf