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EEVblog 1375 - Mailbag

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Published 17 Feb 2021

Another bumper Mailbag! Forum: https://www.eevblog.com/forum/blog/eevblog-1375-mailbag/ SPOILERS: 00:00 - Start 00:17 - Dave hates cats 02:29 - BIG stud power diodes and SCR's 06:20 - Workbench of the week. Louis Borsu from Brussels, Belgium 08:20 - Amiga Addict magazine: https://www.amiga-addict.com/ 11:35 - Dave levels up in the IEEE 13:09 - Canadian LCR Reader MPA Tweezers: https://lcr-reader.com/lcrreadermpa.html 23:07 - FNIRSI DC-6006L portable USB-PD power supply: https://s.click.aliexpress.com/e/_9ITPqM 2nd suck of the sav: 33:20 - FNIRSI 1C15 Handheld oscilloscope: https://s.click.aliexpress.com/e/_APLEKs 40:32 - The Trig Board from Kevin Darrah: https://trigboard-docs.readthedocs.io/en/latest/index.html# https://www.kevindarrah.com/ Youtube Channel, help him hit 100k subs! /user/kdarrah1234 45:50 - Random mystery teardown Subscribe on Library: https://lbry.tv/@ eevblog:7 EEVblog Web Site: http://www.eevblog.com The 2nd EEVblog Channel: /EEVblog2 EEVdiscover: /eevdiscover Support the EEVblog through Patreon! http://www.patreon.com/eevblog AliExpress Affiliate: http://s.click.aliexpress.com/e/c2LRpe8g Buy anything through that link and Dave gets a commission at no cost to you. Donate With Bitcoin & Other Crypto Currencies! https://www.eevblog.com/crypto-currency/ T-Shirts: http://teespring.com/stores/eevblog

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Comments - 441

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@alanrutlidge47673 years ago Hi dave. The last mystery tin box is from a siemens dual terminal optical fibre system. It' s the supervision, alarm monitoring and reporting device. the lt1 and lt2 buttons refer to line terminal 1 and line terminal 2 hardware equipped to the same subrack. A tech could easily toggle the lcd to display alarms from each line terminal independently on the 2 line display using these buttons as well as a facility to scroll through past events.
the unit also extended alarms by applying an earth potential via relay contacts to the power and alarms panel in the equipment rack and to the station' s generic alarm facility for visual, audible and remote monitoring purposes. The reg buttons refer to optical regenerators along the fibre route between line terminals. You used the buttons to view the alarm events at each regenerator site. ...Expand 247
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@CompuHacker3 years ago " do they still make semis in mexico? "
there' s a 10, 0 acre reservation for the development of apark for semiconductor (aimed at newer nodes) manufacturing on the california u. S. /Mexico border, with plans for local power generation, on-site water purification (built) amenities, a hospital, with plans for daily commutes of american and mexican workers (includes plans for a new border checkpoint) named " silicon border" seems to have no recent developments of actual industrial facilities or any livable buildings, and may have been by the standards of this channel a giant scam. Enjoy researching that, fellow viewers!. ...Expand 73
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@xbst3 years ago "There is no note" throws note away 39
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@dumandugu68903 years ago Thank you for sharing great quality content, i' ve learned much from your channel and forum. Kind regards from mexico. 10
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@Damien.D3 years ago " i hate cats" is not in china"
ho my. This kind of words could start a third world war. 42
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@JWH33 years ago It would be nice to see a decent teardown of one of those beefy diodes or scrs. 11
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@m4dizzle3 years ago Definitely loving this new bench of the week style! 2
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@george.b.3 years ago Silly dave, it' s not an oscilloscope - it' s an oscillosocpe! It' s written right there on the box! Totally different beast. 9
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@sveip3 years ago The shelves in louis' workbench are the legendary ikea ivar system shelves. Ivar is a common nordic first name btw. 8
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@justin.campbell3 years ago Welp. Its like 12: 25 am where i am and im just sitting here watching an aussie bloke open his mail with an oversized knife. 66
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@PilotPlater3 years ago The trigboard is a very cool project i' ve been following for a while. 23
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@Shawn_White3 years ago I was admiring the scopes, 3d printer, and pc setup in the background then noticed it was on a monitor. 2
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@goldfingerdash3 years ago Good for you on the senior membership. I became a senior member in june of 2020. Now you can run for office!
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@SeanBZA3 years ago Separate cathode sense lead is because of lead inductance and resistance, as you generally trigger those scr units using a pulse transformer, and the lead ferroresonant not too common, though i have had a few of them as ups units, and they are rugged and reliable, though efficiency is really poor, as the power input is almost constant irrespective of load, though they do provide a really decent sine wave output, just with high third harmonic, but excellent isolation. They do tend to be hard on batteries, as they typically use a scr charger, and they will survive up to 2 cycles mains loss before they switch over, though most are dual conversion, with an always on output stage. 15 2n3773 transistors per half side, and they will blow up very nicely on any fault, blowing the cans off the to3 packages.
still got a ferroresonant line conditioner, which also serves as a pretty good room heater, as it is a 1kva unit, so input power is close to that, and the output is totally isolated. You find the capacitor tend to fail, and you need to replace them with the correct part, as they can have up to 1kv across them under certain conditions, and they tend to run at around 600vac with normal input voltage and output current. ...Expand
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@guffaw17113 years ago I know youtr tv background is pretty great when it fools me for a few seconds to believe that you changed your offices and i just haven' t heard the . ...Expand 12
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@Wtfinc3 years ago Thank you dave for featuring kevin' s youtube where i saw in the screenshot he had a video of how to read from esp32 and i was on the lookout to learn about the esp32 since ive acquired one.
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@decee11573 years ago I actually also recently ordered a dc-6006l power supply. Looked at it many times and finally pulled out my credit card and ordered it.
curiously . ...Expand 1
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@isettech3 years ago I have a few of those diodes too, and the companion scrs. This is from the 1970' s and a driver failure resulted in commutation failure, shorted scrs . ...Expand
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@ArmandasJarusauskas3 years ago Dave, the signal was bouncing on the scope because the horizontal trigger point is set all the way to the right.
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@SatprodStudio3 years ago Thanks dave for the background selection! Thanks also for the good comments! I try to keep it clean and organized because it is how i feel the best to . ...Expand
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@polkijain973 years ago Love the lab background today. It lights up your dungeon! 2
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@dorusan3 years ago Oscillosocpe. On the lcr product case, d' oh! 12
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@georgemoore53073 years ago I' m surprised you didn' t recognise your first item the scr. I have a dud that is about the size of a hockey puck it was rated at 1700v and 600 a. Both sides mounted onto the buss work. 7
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@ColinMcCormack3 years ago I love the trigboard. If the power consumption was any lower, it' d be a current source:
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@jasonk97793 years ago Here i am editing videos in vegas with dave opening his mail in the background. Brilliant!
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@lasersbee3 years ago The 3 wire jobbies looks like SCRs.Silicon Controller Rectifiers
. At $335 USD plus shipping it's a bit pricey. A shootout sounds quite interesting. .. ...Expand
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@MarkMcDaniel3 years ago Ooh senior member. Do you get a 10% discount at the local pancake house? 38
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@akosbuzogany27523 years ago If you use the programmable opamp to select ranges, after a simple two-point calibration atmel can handle ad conversions surprisingly well!
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@restcure3 years ago It looks as if the ends of the plastic bits covering the arms of the lcr tweezer makes contact before the tips do.
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@ArnaudMEURET3 years ago Huh dave, youare being the kickstarter for the amiga addict magazine!
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@charlesdickens67063 years ago But for the workshop you show us early i didn' t notice fire extinguishers on walls. Smoke alarms would also help. 1
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@mmemotorsport3 years ago Did anyone else notice spelling error on the lcr reader box? Oscillosocpe: 5
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@jaycee19803 years ago Louis has a Big Knob! No. he really does have a Mackie Big Knob mixer :) The Sound-On-Sound review for these is hilarious 1
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@travishein3 years ago I do really enjoy seeing these random tear downs. I have a sort of nostalia for these old many card plug in board designs. I realize today this can all . ...Expand 1
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@byronwatkins25653 years ago Congratulations, dave! I think those voltage ratings need multiplied by 10.
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@goddamnmaddog20243 years ago @ , when you show the tips in close up, on the rear tip, there is something. It looks sike solder beads. If they are not conductive, you would have to apply pressure, until the metal sufaces further behind get contact. .. ...Expand
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@FreezeAU3 years ago Yes please for the tweezer shootout, im about to buy one! 7
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@Anonymous-je7qc3 years ago The red wire is actually just cathode connection for gate driving (note that gate voltage is relative to cathode).
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@Youtronics3 years ago That flat flex connector looks like it's not locked, that could explain the contact problems.
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@andersthuresson3 years ago I would love to get some useful comparison between lcr tweezers. I am interested in buying one. 1
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@alexandrecouture24623 years ago The big diodes are what you can find in 400a hobart welder.
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@vidasvv3 years ago Yup, those scr' s and diodes are small compared to the ones i got to play with back in 1980 when i started up and serviced the worlds larges (at that . ...Expand
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@neilw2O3 years ago I notice the usb-pd power supply has go those lovely olive green bulging brand electrolytics. Replaced 2 in other aldi stuff this week. Give ' em 2 years.
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@KB1UIF3 years ago Haha, i never thought i would hear dave talk about a " big stud package"
i remember showing diodes and scr' s that size when i was training young apprentices at british telecom over in england.
when semiconductors are that size they make good examples and training props!. ...Expand 1
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@alexstroud38543 years ago Could be the only, and therefore best selling, active) amiga magazine!
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@dtiydr3 years ago I thought when the heck did he got windows in his lab? Took a second before i realized how. 4
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@TheTrashcutter3 years ago Full bridge rectifier out of the stud power diodes!
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@michael.a.covington3 years ago Congratulations on making ie senior member! I " leveled up" some years ago for doing ai research and don' t know a quarter as much as you . ...Expand
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@bjtaudio3 years ago I have found those mini tweezers multi-meter testers to have reliability issues, they generally are extremely inaccurate when measuring low value inductance.
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@tinygriffy3 years ago @ .. the 74LS00N would be the perfect designator for a delay circuit ^^ .. like "when will I get my signal ? 74L .. S00N"
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@chrismorley53933 years ago Is the little scope all jittery/wobbly because the trigger is off the screen to the right? Iirc my rigol 1054z has problems when the trigger is way off the screen. 1
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@YounesLayachi3 years ago Congrats! Well deserved
i didn' t know exactly what it means to be a senior member but i think the ie is important enough.
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@lahmyaj3 years ago - Noooo! There was a note! lol you chucked it on the floor (at least there was something looking like a manual or something lol) 1
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@mrechbreger3 years ago doesn't the IEEE have enough money for a CNC router or are you the first Senior Member and they tried to use it the first time with some furniture wood they've found on the road? .. ...Expand 13
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@bartomiej3683 years ago Isn' t that second wire in scr for measuring current in fact?
you measure voltego drop across thick wire and knowing its impedance you could calculate current.
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@eDoc20203 years ago A few years ago i hacked a wrt54g router to act as a remote wireless sensor, using the enable pin on the buck converter to shut the unit down and save power. That looked absolutely primitive compared to the trig board.
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@simontay48513 years ago Are there actually any half decent handheld o' scopes that can display their claimed frequency properly. Even at 50mhz and lower, that thing . ...Expand 5
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@josephchamness99153 years ago Yay, at last a notification that leads to a video that isn' t private or deleted: p: d o_o. 4
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@JoelCHopper3 years ago Love that shirt! All the old school robots! I' m aging myself by knowing where all of them come from.
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@markh52103 years ago I suspect the " best selling" active amiga magazine achieved its status by selling more than zero copies.
never used the amiga- would . ...Expand 1
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@BogdanSerban3 years ago You can actually test short turns in a transformer with an esr meter.
and that power supply looks like a synchronous buck converter using tl594.
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@landspide3 years ago " i squeeze it really hard and it comes on" dicky contacts. 16
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@klightspeed3 years ago it looks like that power supply module is about 95% efficient (dissipating about 3.3W) based on the power source output (64.052V * 0.938A = 60.08W input vs 56.79W output) .. ...Expand
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@DantalionNl3 years ago Prediction: the portable usb-pd supplies use an xlsemi xl4016 buck convert ic. 1
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@stheil3 years ago Those staggered connectors look weird at first, but admittedly it's an easy and efficient way of "keying" the plug-in boards. I love it!
Also what's with the weird angle on that IC visible to the left at ~ ? Haven't seen that before. .. ...Expand
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@delinquentdesign3 years ago Last device looks like broadcast equipment maybe esa emergency service announcement equipment which prints out instances of test and actual announcement information that is transmitted through said device. 1
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@eigencap3 years ago I love how he' s using a spoon to open the first box.
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@DaveRepairs3 years ago No that Amiga Bill, I let him know ur talking about him. We are going to be in the next few issues with a huge article. Seriously, the Amiga scene is live and kicking and its huge right now ! HAHA (I didn't send it to u). thanks for the laughs .. ...Expand 3
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@plasmaman95923 years ago My cnc plasma cutter with water table came with the ss braided probably the smaller of the 2. My machine is rated 3 phase 300 amps i think. My actual plasma is only 125a though. 1
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@wb5mgr3 years ago Congratulations from a fellow senior member ie usa section 5.
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@petersage51573 years ago I remember when we used to have newsagents at the mall; last time I remember seeing one was in the 1990s. I'm sure that the spaces have been through quite a few tenants over the years as commercial trends came and went; most of them are probably vape shops now.
"You pass butter!" .. ...Expand
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@DjResROfficial3 years ago Old tower crane at concrete panel factory used similar thyristors and diodes in controller for main motor.
Edit: - board can be multilayer._
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@TheOnlyPsycho3 years ago Note in package "Do not shake, precision mechanical assembly!!!" :-P
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@healLV3 years ago I actually thought that was your real background until you brought up lab of the week. 1
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@zman15083 years ago There' s a sydney amiga user group i am a part of its a fun little group of folks around the old computer still. 2
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@octapc3 years ago The secret ie handshake is only for the top 1% lol. 1
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@michaelhawthorne86963 years ago Spotted your Space Odyssey 2001 reference Dave at ."It's full of boards".Dave Bowman's line in the film."It's full of stars." .. ...Expand
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@BradsGuitarGarage3 years ago I reckon those tweezers have lacquer on the probes. 1
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@altimmons2 years ago Rigol did offer a lab package deal a while back- it was like $1100 for all 4 parts - psu, scope, multimeter, and a function gen? Which was a great deal. . ...Expand
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@kevincozens68373 years ago @ The box says "Oscillosocpe" :) The website of the Canadian LCR meter shows US$ prices. :P 1
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@jamesdk54173 years ago Those prusa i3 printers are something like $10 delivered to australia. 1
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@AcidiFy5743 years ago Btw since arduino is oshw
&is a damn good
i thought to myself, is there an oshw alternative to raspberrypi?
(is odroid, orangepi or olinuxino?
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@colinpye14303 years ago A cat by any other name is still a sneaky little fur-ball that yaks behind the sofa.
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@LutzSchafer3 years ago Dave i do have the syborg tweezer as well. Try to clean the tips with ipa. I noticed a similar behavior too at first. Also tighten the screws. It' s . ...Expand
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@cutterscut3 years ago Thanks dave, fnirsi dc-6006l portable usb-pd power supply well presented, seen, felt good and immediately bought on aliex. Only 30, with shipping t id="hidden44"o germany. Exactly what i' m looking for, great pleasure more of it. That' s how the community should work here, thats well done mr. Thank you very much. Ciao roberto. ...Expand
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@Digital-Dan3 years ago Most such names are easily pronounced by simply saying each of the syllables in order, using the most likely sound of same.
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@MrDoneboy3 years ago Summer in australia? Our asses are freezing down in the heart of texas!
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@jh77sly3 years ago Cat person here. I crack cat jokes too because they can be awful jerks. Those that get their nickers in a knot over it can leave.
i have no problem . ...Expand 5
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@lahmyaj3 years ago - "RTFM" lol had to think about that one for a sec!
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@DavePoo3 years ago I've been watching the EEVBlog since i discovered it from the Amiga 500 teardown (EEVBlog ). I don't think it was that Amiga that was corroded, i think that was an Archimedes in a different teardown. .. ...Expand
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@erniepasveer80273 years ago What would the typical voltage drop be on those stud diodes? Just curious.
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@rng88913 years ago Ie senior member. I got mine last year. You, me and grant imahara! Yes, i know there are others)
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@69uremum3 years ago The tips are replaceable, why would you disassemble the thing to remove the arms in order to replace consumables?
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@irishguy2000073 years ago Those diodes are from the first terminator.