EEVblog #1375 - Mailbag - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 17, 2021, 05:15:59 am
content: Another bumper Mailbag!SPOILERS:00:00 - Start00:17 - Dave hates cats02:29 - BIG stud power diodes and SCR's06:20 - Workbench of the week. Louis Borsu from Brussels, Belgium08:20 - Amiga Addict magazine:https://www.amiga-addict.com/11:35 - Dave levels up in the IEEE13:09 - Canadian LCR Reader MPA Tweezers:https://lcr-reader.com/lcrreadermpa.html23:07 - FNIRSI DC-6006L portable USB-PD power supply:https://s.click.aliexpress.com/e/_9ITPqM2nd suck of the sav:33:20 - FNIRSI 1C15 Handheld oscilloscope:https://s.click.aliexpress.com/e/_APLEKs40:32 - 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!https://www.youtube.com/user/kdarrah123445:50 - Random mystery teardown

author: Monkeh
author_rank: Super Contributor
timestamp: February 17, 2021, 05:30:34 am
content: "Custom shelving" - haven't made it to an Ikea in a while, Dave?

author: CChin254
author_rank: Regular Contributor
timestamp: February 17, 2021, 09:49:02 am
content: Siborg Systems Inc. LCR-Reader-MPADesign Wins:IC Identification:Block Diagram:

author: kirill_ka
author_rank: Frequent Contributor
timestamp: February 17, 2021, 03:17:39 pm
content: Quote from: CChin254 on February 17, 2021, 09:49:02 amIt looks suspiciously close to this product:http://www.rlc-esr.ru/index.php/en-us/multimetr-pintset-nv15Which is the sixth generation. I have nv11 (third generation) for many years now. A good tool!

author: CChin254
author_rank: Regular Contributor
timestamp: February 18, 2021, 04:48:32 am
content: Some more IC Identifications:FNIRSI Handheld Oscilloscope 1C15:Design WinsIC IdentificationBlock DiagramTrigBoard V8.1:

author: Fungus
author_rank: Super Contributor
timestamp: February 18, 2021, 11:10:03 am
content: What's the forward voltage drop on those diodes? Can you measure it with your new multimeter?

author: alxpo
author_rank: Contributor
timestamp: February 18, 2021, 06:33:26 pm
content: An interesting detail about high-power diodes and SCRs is that they are complete with Belleville springs. I wonder if the springs were sold with the diodes or added during assembly.

author: SilverSolder
author_rank: Super Contributor
timestamp: February 18, 2021, 09:09:27 pm
content: Congratulations on your IEEE recognition. I think most of us know how much you have done / are doing for the electronics engineering community across the globe and it is only right that the official bodies recognize it too!

author: rsjsouza
author_rank: Super Contributor
timestamp: February 18, 2021, 10:51:52 pm
content: It may well be your unit, but the LCR tweezers are really terrible. Sure, the interface looks alright and I like the fact it is a mini joystick (saves on pressing a button repeatedly to reach the desired setting), but try relying on ESR/D measurements with such flaky connection.The oscilloscope seems alright and hopefully is good enough. About $70 would be quite a feat if it works well.Congratulations on the Senior member status!

author: SilverSolder
author_rank: Super Contributor
timestamp: February 19, 2021, 05:37:13 am
content: An LCR tweezer shootout would be great...Especially: How do they perform with in-circuit measurement? - measuring loose components is all well and good, but tweezers that work reliably in circuit... yum!

author: Kleinstein
author_rank: Super Contributor
timestamp: February 19, 2021, 10:57:35 am
content: In circuit measurements are always tricky. Ideally they would use different test signals and not just a fixed one - this would be more like a rather complicated system, not so much to fit to such a tiny unit. Some in circuit tests work OK, but some just fail because of unexpected parallel paths.Having different 2 component models is allready quite good. So the reading is not just R or C or L but some RC or RL. This is more than one gets from the usual DMMs.With the usually limited power if the tweezers the test signals tend to be small, which is often good for in circuit tests.Reading the values from small SMD resistors and caps is difficult. Conventional probes are hard to use with small SMD parts - so the tweezers are a convenient way to check parts before soldering. For the shown version the distance from the tip to the display is rather large, though it may be good with small parts, working under a microscope.The contact problem witht the tweezers may be some dirt on one of the tips - in the video it looks a bit like that for the first tip to look at.

author: Bud
author_rank: Super Contributor
timestamp: February 19, 2021, 10:12:50 pm
content: Quote from: SilverSolder on February 18, 2021, 09:09:27 pmDo you guys really think someone at IEEE is sitting and watching engineers' contribution and when gets amazed nominates them to whatever award? This is merely "recognition of good standing" which if translated to plain language means something like "oh, thanks for paying you IEEE membership fees all these years so we at the board of directors can have our yearly bonuses. Here is your fake wood plaque, do not forget sending your next payment".

author: tunk
author_rank: Super Contributor
timestamp: February 19, 2021, 10:33:21 pm
content: Any chance of a teardown of the USB charger that came with the FNIRSI 1C15?I.e. is it about OK or is it craptastic?

author: SilverSolder
author_rank: Super Contributor
timestamp: February 20, 2021, 12:28:58 am
content: Quote from: Bud on February 19, 2021, 10:12:50 pmThere are plenty of engineers that are not IEEE members at all - even if because they cannot afford it - which implies they might not be very good!

author: Brumby
author_rank: Unknown
timestamp: February 20, 2021, 01:32:32 am
content: Quote from: rsjsouza on February 18, 2021, 10:51:52 pmDoes that mean we might now start seeing the manifestation of "Senior's moments"?Hope not.

author: M4trix
author_rank: Frequent Contributor
timestamp: February 20, 2021, 02:15:08 am
content: Quote from: Brumby on February 20, 2021, 01:32:32 amWell, Dave is using farsighted glasses now. It's a good start. Btw, welcome to the club Dave !

author: rsjsouza
author_rank: Super Contributor
timestamp: February 20, 2021, 03:29:52 am
content: Quote from: M4trix on February 20, 2021, 02:15:08 amExactly. Going Senior is the way to go... The alternative is worse...

author: cdev
author_rank: Super Contributor
timestamp: February 25, 2021, 05:18:15 pm
content: Quote from: EEVblog on February 17, 2021, 05:15:59 amThat multiuse LCR tweezer/osciloscope looks super useful.

author: Wollvieh
author_rank: Contributor
timestamp: February 26, 2021, 02:06:29 am
content: The mystery teardown has "TeKaDe"-stickers from 1987 on it, a German company producing telecommunications and teletypes. So I would guess the module is the CPU and configuration panel for a kind of switchboard, with option for printout of the config, status, logs etc.I've seen similar modules in emergency lighting and fire detection systems of the 80s, when modules in 19" racks were standard. And as no one had USB-Sticks at hand, they had printer ports or even a tiny printer module in the rack.

author: Kaluluka
author_rank: Contributor
timestamp: June 28, 2021, 06:02:26 am
content: Link with information about TeKaDe in english:https://www.cryptomuseum.com/manuf/tekade/index.htm