EEVblog #272 - Manson 9400 40A 3-15V Switchmode PSU Teardown
Service Manual: http://eevblog.com/files/SPS9400_ServiceManual.pdf What's inside the Manson SPS9400 40A 3V to 15V Switchmode Power Supply? Also known as the Jaycar Powertech MP3090 and BK Precision 1692
Dave investigates two very serious issues with jitter on the Rigol DS1000Z series oscilloscopes, including the DS1104Z and new DS1054Z
Some sort of modulated sampling/trigger jitter problem at 5 microsecond intervals (the "5us jitter problem"). And severe jitter with the AC coupled trigger mode, a problem which is also present on the DS2000 series scopes as well.
NOTE: So many people have been confusing AC trigger coupling with AC input coupling people will be more familiar with. This issue has *nothing* to do with AC input coupling, it is AC trigger coupling!
Mads from EcProjects found the 5us jitter problem:
https://www.youtube.com/watch?v=dHQ4MsMFJTk#t=172
https://www.youtube.com/user/EcProjects
Forum: http://www.eevblog.com/forum/blog/eevblog-683-rigol-ds1000z-ds2000-oscilloscope-jitter-problems/
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Two brand new Fluke CNX-3000 "basic kit" are up for grabs, plus a (slightly used) Gossen Metrahit World multimeter, and a slightly reviewed ChronoVu LA-8 Kit Deluxe logic analyser.
Enter the contest here:
http://www.eevblog.com/forum/contests/eevblog-oct-2013-contest-giveaway/
NOTE: You must have 5 posts on the EEVblog forum to see this contest thread!
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60 minutes of Dave assembling his silent (low noise) Intel i7 3770K video editing computer. If you find that boring, don't watch.
NOTE: This is NOT an instructional video!
YES, I used WAY too much thermal paste (as shown in the heatsink instructions!), get over it. I cleaned it and fixed it afterwards.
YES, I initially put the memory in the wrong sockets.
YES, I did not do any cable management, I just wanted to test the thing, get over it.
I fixed all those issues, so no more stupid comments please.
Also, please DON'T leave uninformed generic comments about needing a high end video card for editing and rendering. You are wrong for my case, read this first:
http://www.eevblog.com/2013/04/16/des...
Coolermaster Silencio 550 case.
Asus Z77 motherboard
Coolermaster 212 Evo heatsink
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Some troubleshooting on the USB PSU DC-DC Converter
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The EE Rap
Music: C.Had
Vocals: C.Had, Ben Brand
Sound Bites thanks to Dave Jones of EEVBlog.com
Inspired sites: EEVBlog.com, HackNMod.com
Lyrics:
http://eevblog.com/files/EERapLyrics.txt
Bristol University have a neat new "zero power sensing" chip that takes energy harvested signals and switches an open drain output, the UB20M Voltage Detector.
But the marketing has gone too far when they demo a TV that supposedly has zero standby power. Dave busts this smoke and mirrors demo.
http://www.bristol.ac.uk/engineering/research/em/research/zero-standby-power/
Forum: http://www.eevblog.com/forum/blog/eevblog-971-zero-standby-power-tv-busted!/
Datasheet: http://www.bristol.ac.uk/media-library/sites/engineering/research/eem-group/zero-standby/UB20M_Datasheet_Rev.1.2.pdf
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An unboxing anf first impression of the OWON 14bit XDS3202A Oscilloscope.
Note, this was shot as single take for the 2nd channel, but thought it might be better off here but with no EEVblog number. It is NOT a review. If you don't like unboxings and just bumbling around with the scope the first time and ranting then please don't watch it.
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The Dulmont Magnum "Kookaburra" from 1983 is the only laptop to have even been design and made in Australia, as well as being one of the world's first "clamshell" laptop designs.
Dave tears down this obscure retro classic based on the equally rare 80186.
Brochure: http://www.eevblog.com/files/Kookaburra.pdf
UPDATE:
John Blair has responded about this video:
Dave
Thanks so much for sending this along; I got a huge kick out of it.
I can answer some of the questions you raised in the video:
(*) You're right there was no removable R/W storage in 'laptop' mode; the 'disks' that MSDOS saw were implemented in RAM. You added removable storage by connecting the dual floppy drives via the parallel connector that you noted on the back.
(*) I wasn’t the original designer; I was brought in to run the software team (once Barry had the prototype hardware up), which I did throughout. Chris T was brought on later to run the hardware team; he and I worked together. Terry Crews was originally hired before me as engineering manager before me but it was immediately clear that he had no clue what he was doing in that role; they made him marketing manager, where he was responsible for those remarkable ads that you cited.
(*) The parallel port wasn’t really custom – was a standard configuration for that era.
(*) The 15 way ports were serial ports for printers et al, as you note later
(*) The RCA connector was a video port, as you note later.
(*) You're right that the ROMs contained MS-DOS – we actually had to modify MSDOS so that it ran from ROM, which was hard to do; lots of Gatesian self modifying code. I don’t believe anyone else got that to work, but it had a major benefit, in freeing up all the SRAM for stack and RAM disk
(*) 6:46 is classic, but in Barry's defence the model you have there is some weird prototype; hence all the kludges and the handwritten labels.
(*) The 80186 was NMOS, as you note. That was kind of the miracle here. Barry and I didn’t want CMOS because they were so so slow. But NMOS consumed a lot of power. The solution was to mod MSDOS so that the CPU and all of its support could be powered off between keystrokes; each time you hit a key, the 186 would come up from cold, and transparently reenter the OS. As you note. Gave us all of the performance of a PC and great battery life. We were much faster than 8088 desktops of the time.
(*) You Got It Working!!!! That’s so great! Congratulations.
(*) Drive B wasn’t ready because it was the plug in ROM
(*) The SRAM kept alive all the time – that’s where the RAM Disks were
(*) The tirade at the end isn’t really fair – this was a prototype between the Magnum and the Kookaburra . None of the points you make about removable store, video etc are correct – remember that when you plugged in a video monitor and disks, this was the fastest desktop PC of the time, that you could also take on the road.
Forum: http://www.eevblog.com/forum/blog/eevblog-949-vintage-australian-made-laptop-teardown/msg1080508/#msg1080508
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