A very interesting repair of an Agilent/Keysight U1273AX OLED display multimeter. It had two distinct unrelated faults.

Ian Scott Johnston on The Amp Hour: https://theamphour.com/643-calibration-repair-with-ian-johnston/

Forum: https://www.eevblog.com/forum/blog/eevblog-1564-agilentkeysight-u1273ax-multimeter-repair/

00:00 – Faulty Agilent / Keysight U1273AX OLED display multimeter
01:36 – Battery leakage, OF COURSE!
04:26 – Bottom of PCB
05:47 – The OLED display
10:09 – Annoying voltage measurements
15:14 – At great expense to management, a new OLED
18:18 – Winner Winner Premature Dinner
20:19 – The Repair is over, right? RIGHT?
21:22 – Accuracy fault. Repair time again.
25:23 – Hybrid Thin Film Resistor Dividers
26:56 – Parallel contamination
29:44 – When in doubt, suck it off

Teardown of the new $389 12bit Rigol DHO800 oscilloscope!

Forum: https://www.eevblog.com/forum/blog/eevblog-1563-new-$389-12bit-rigol-dho800-scope-teardown/

EXCLUSIVE Unboxing and first impressions video: https://www.eevblog.com/2023/09/01/website-exclusive-rigol-hdo800-oscilloscope-unboxing/

HDO1000 Teardown: https://www.youtube.com/watch?v=qEpkVa_ysaw
HDO4000 Teardown: https://www.youtube.com/watch?v=W1Jl0rMRGSg

Teardown photos:

00:00 – Rigol’s NEW $389 DHO800 12 bit Oscilloscope!
02:43 – USB-C Powered
03:19 – Teardown of the Small Sparrow, and the DHO900
06:39 – Heatsink Removed and cost reduction
08:01 – Is the USB-C connector robust enough?
11:25 – Plastic moulding
12:13 – Back side of PCB
12:48 – PCB Comparison with HDO1000
13:56 – The ADC
15:13 – What is the missing memory?
15:42 – BOM cost INCREASE? Why?
16:40 – Bypass caps WTF. Madman Muntz is turning in his grave!
17:42 – Front end comparison with DHO1000 and HDO4000
20:00 – The Logic Analyser
21:15 – The Arbitrary Waveform Generator option in the DHO900
22:39 – PCB summary, and Dave doesn’t allow this type of production engineering!
22:31 – Serial boot dumping
25:56 – The boot Android O/S micro SD card
27:15 – Power consumption and summary

The Rigol HDO800 might very well be a revolution in the entry level oscilloscope market.
12bit, touch screen, HDMI, VESA mount, USB-C powered starting from from US$329
This is NUTS! And it’s super cute.
Are 8 bit scopes DEAD?

Teardown of THE 1980’s Boombox / Ghetto Blaster, the iconic Sharp GF-7600

That boombox from the iconic scene with John Cusak in Say Anything playing Peter Gabriel’s In Your Eyes

Unboxing: https://www.youtube.com/watch?v=381wHMamsYQ
Sony Walkman teardown: https://www.youtube.com/watch?v=a0B4CWfYE8I

Forum: https://www.eevblog.com/forum/blog/eevblog-1562-the-1980s-boombox-teardown-sharp-gf-7600/

TEARDOWN PHOTOS:

Part 21 of the uSupply USB power supply design. An update on where the project got to and why.
A look at the working unit, PCB and schematic.

Design series Playlist: https://www.youtube.com/playlist?list=PLE37A0E6F75C37452

Forum: https://www.eevblog.com/forum/blog/eevblog-1561-usupply-usb-power-supply-part-20/

Tech Tip: How to use you Arbitrary Waveform Generator as a High Resolution DC Voltage Source!

Siglent teardown: https://www.youtube.com/watch?v=Ijb_SzJ9Fs0

Forum: https://www.eevblog.com/forum/blog/eevblog-1560-tip-use-your-arb-gen-as-a-high-resolution-dc-voltage-source!/

Dave answers a Twitter question: How should I design a PCB trace to carry 80A of current, and can this be done on one PCB layer? The answer is, well, complicated. Let’s go down the PCB design rabbit hole of current rating PCB traces.

Designing a PCB trace for 70-80A.

How should I design the trace from the connectors to a Mosfet(THT) device for this current rating?
Is it possible to use only one layer?@eevblog

— Abhinav (@abhinav_937) August 8, 2023

PCB Design Video Playlist: https://www.youtube.com/playlist?list=PL8D3B363139B67FF3

Forum: https://www.eevblog.com/forum/blog/eevblog-1559-pcb-design-trace-current-rating/

00:00 – Twitter question: How should I design a PCB trace to carry 80A of current
01:09 – Ohms law and copper losses
02:06 – PCB Trace calculator
02:45 – The three (four) major factors to PCB current handling calculations
02:54 – Trace Width and Copper thickness (weight) and PCB stackups
04:18 – A trap with Multilayer PCB designs
05:20 – External vs Internal layer matters with thermal design
06:20 – What happens if you exceed the maximum current rating?
07:23 – PCB plating matters
08:12 – Electrical vs Thermal design considerations
09:30 – 1oz copper vs 2oz vs 4oz
10:35 – Solder and tin plated traces
11:37 – Let’s look at what a PCB manufacturer offers, HASL, SMOBC, ENIG etc
12:46 – How do you get your PCB traces plated in your design?
14:31 – Those are rookie temperature numbers, you gotta pump those up!
14:51 – The IPC 2152 and IPC 2221 standards are a bit How’ya’Doing
16:30 – The physical and thermal part of your product design matters
16:47 – Thermal conduction to planes matters
19:30 – Does VIA stiching matter?
20:30 – Have you considered a Bus Bar?
21:56 – We can get 80A on a single PCB trace, BUT…
23:18 – Can I interest you in bodge wire Sir? It’s complete legit.
24:17 – PCB Standard WARS!
26:19 – Forget about etch factor
27:08 – Internal vs External trace calculations

More random mailbag!

PocketFrog: https://standardmeasurement.us/
Omnifixo Maker’s Third Hand: https://kandaelectronics.com.au/products/omnifixo-of-m4-makers-third-hand
NASA Red Crew: https://www.nasa.gov/feature/artemis-red-crew-team-helps-enable-successful-launch/
https://caberqu.com/
https://github.com/DanInvents/Rockit/

00:00 – Mailbag
00:42 – PocketFrog USB Lab in your pocket
22:40 – Omnifixo OF-M4 Magnetic PCB Holder
28:32 – NASA Artemis 1 Red Crew – Billy Cairns
30:36 – Caberqu C2C USB-C Cable Tester
39:30 – Rocket Rocket-Operation Computing Kit (Rockit)
42:44 – RIFA Capacitor FAIL

Review of the new Micsig SigOFIT Optical Fibre oscilloscope probe, including a practical demonstation of the incredible CMRR range of opticallly isolated probing of a 300V GaN transistor driver circuit.
And a direct comparison with the HVP-70 high voltage differential probe to show you the incredible game changing difference optical fibre probes make.

https://www.micsig.com/SigOFIT/

CMRR Explained video: https://www.youtube.com/watch?v=vDe_BHvRpks

Forum: https://www.eevblog.com/forum/blog/eevblog-1557-micsig-sigofit-optical-fibre-probe-gan-experiment/

Links:
https://www.infineon.com/dgdl/Infineon-1EDF5673K-DataSheet-v02_04-EN.pdf
https://www.infineon.com/dgdl/Infineon-ApplicationNote_CoolGaN_600V_emode_HEMTs_-Driving_CoolGaN_high_electron_mobility_transistors_with_EiceDRIVER_%201EDI_Compact-AN-v01_00-EN.pdf
https://www.infineon.com/dgdl/Infineon-ApplicationNote_CoolGaN_600V_emode_HEMTs-AN-v01_00-EN.pdf
https://www.infineon.com/dgdl/Infineon-ApplicationNote_EvaluationBoard_EVAL_1EDF_G1_HB_GAN-ApplicationNotes-v01_03-EN.pdf
https://www.infineon.com/dgdl/Infineon-GalliumNitride_CoolGaN_emode_HEMTs-ProductSelectionGuide-v01_01-EN.pdf
https://www.infineon.com/dgdl/Infineon-IGOT60R070D1-DataSheet-v02_14-EN.pdf
https://www.infineon.com/dgdl/Infineon-ProductBrief_GalliumNitride_CoolGaN_600V_e-mode_HEMTs-ProductBrief-v03_00-EN.pdf
https://www.infineon.com/dgdl/Infineon-SolutionBrief_CoolGaN_and_GaN_EiceDRIVER-ProductBrief-v01_00-EN.pdf
Demo board: https://www.digikey.com/en/products/detail/infineon-technologies/EVAL1EDFG1BHBGANTOBO1/13548558

00:00 – Micsig SigOFIT Optical Fibre Probe vs Active FET
02:25 – High Voltage Differential Limitation and why you might need an Optical Fibre probe
03:25 – Galvanically isolated, and power-over-fibre
04:39 – Comparison with the Tek IsoVu & Lecroy DL-ISO
05:55 – The CMRR is AMAZING!
07:15 – A look at the SigOFIT probe
10:04 – An optical fibre probe is NOT a high voltage differential probe!
10:40 – Practical example using a 600V Gallium Nitride GaN circuit demo
11:39 – What is a Gallium Nitride (GaN) Transistor?
13:23 – GaN / HEMT, and Silicon Carbide SiC Transistors
14:21 – IGOT60R070D1 600V GaN datasheet & Half Bridge switching configuration
15:30 – This is IMPOSSIBLE with a regular probe!
19:07 – GaN EiceDRIVER chip
19:54 – The practical GaN test setup
23:10 – Remote MXO4 scope control to take measurements
24:36 – High side GaN power transistor measurement with the SigOFIT
26:26 – Here is where the CMRR MAGIC happens!
27:41 – Comparison with HVP-70 High Voltage Differential Probe
28:45 – Look how the High Voltage Differential Probe is just horrible here!
31:56 – Baseline High Voltage Differential probe ringing vs SigOFIT
32:21 – Noise measurement
36:27 – Conclusion

To everyones shock, a SolaRoad cycleway installation in Maartensdijk in Utrecht province of the Netherlands only produed 26% of it’s projected output, AGAIN! When will this nonsense stop?

Links:
https://nos.nl/artikel/2484255-innovatief-zonnefietspad-bij-maartensdijk-levert-bijna-niets-op
https://www.dutchnews.nl/2023/07/solar-bike-path-fails-to-meet-electricity-targets-again/
https://www.wattisduurzaam.nl/37168/energie-beleid/utrechts-zonnefietspad-op-koers-voor-40-van-beoogde-opbrengst/
https://www.wattisduurzaam.nl/16140/energie-opwekken/7-veelbelovende-innovaties-die-de-transitie-geen-steek-verder-helpen/
https://twitter.com/WattisDuurzaam/status/1525171198052782090
https://www.businessinsider.com/worlds-first-solar-road-turned-out-colossal-failure-2019-8
https://www.archpaper.com/2015/07/bike-path-pieces-skeptics-dismiss-dutch-solar-bike-path-solaroad-inefficient-cash-grab/ Solar roadways
BUSTED Playlist: https://www.youtube.com/playlist?list=PLzET2ZHWnFA-6fnJu8WAhKmIruWDp8CQr

Forum: https://www.eevblog.com/forum/blog/eevblog-1556-solaroad-solar-cycleway-fails-again!/

Has a Korean quantum research group cracked the holy grail of physics, an ambient temperature and pressure superconductor that will win them a Nobel prize and change humanity forever? Probably not. Dave completely busts the demo video of their LK-99 material with a pracitcal lab example, it’s such an embarrassing mistake you won’t believe it!

Links:
https://qcentre.co.kr/
https://arxiv.org/abs/2307.12008
Paper 1: https://arxiv.org/ftp/arxiv/papers/2307/2307.12008.pdf
Paper 2: https://arxiv.org/ftp/arxiv/papers/2307/2307.12037.pdf
Forum: https://www.eevblog.com/forum/blog/eevblog-1555-lk99-ambient-temperature-superconductor-busted!/

00:00 – This LK-99 ambient temperature & pressure superconductor is going to CHANGE THE WORLD!
02:52 – Low but not zero resistance? I thought this was a superconductor?
04:22 – Some journalists are actually doing their job this time
06:28 – The Meissner effect
07:11- Thunderf00t’s take
08:06 – This demo video is just a total embarrassment! It’s just Lenz’s Law!
10:36 – Let’s reproduce the demo video experiment!

LK-99 film magnetic test video: https://www.youtube.com/watch?v=-w2qc_BoEiU

A teardown of a very interesting bit of optometry kit, a Shin Nippon NVISION K-5001 RefKeratometer (Auto Refractor Keratometer). It can measure the curvature of your cornea, and well as refractive error to diagnose near and far sightedness.

Links: https://www.rexxam.co.jp/themes/eye-care/products/images/nvk5001/NvisionK5001.pdf
https://www.academia.edu/59315264/Clinical_Evaluation_of_the_Shin_Nippon_NVision_K_5001_Grand_Seiko_WR_5100K_Autorefractor
https://www.opticsforhire.com/blog/keratometer-optical-design/
Manual: https://www.yumpu.com/en/document/read/25018677/english-manual

Forum: https://www.eevblog.com/forum/blog/eevblog-1554-optometrist-autorefractor-keratometer-teardown!/

Dave visists the world’s first commercial solar power station in White Cliffs, a small opal mining town in outback Australia. Built in 1981 and using 14 heliostatic tracking 5m diameter dishes, this concentrated thermal solar plant produced 25kW of power using a steam generator.

Links: https://en.wikipedia.org/wiki/White_Cliffs_Solar_Power_Station Analysis report: https://eevblog.com/files/sustain_renew_solar_white_cliffs_project_report.pdf
Mirror efficiency data: https://www.nrel.gov/docs/fy08osti/43695.pdf
Heritage Listing: https://portal.engineersaustralia.org.au/system/files/engineering-heritage-australia/nomination-title/White_Cliffs_Nomination.pdf
History: https://ehive.com/collections/7333/the-white-cliffs-solar-thermal-power-station
Steam genertor assesment: https://www.researchgate.net/publication/309426826_An_Experimental_and_Analytical_Assessment_of_a_Steam_Rankine_Solar_Thermal_Power_System
https://wiki.opensourceecology.org/wiki/Steam_Engine/Correspondence

Forum: https://www.eevblog.com/forum/blog/eevblog-1553-worlds-first-commercial-solar-power-station/

A first look at the new Digilent Analog Discovery 3, plus teardown.

00:00 – Unboxing the new Digilent Analog Discovery 3
02:23 – New features
05:00 – The price and comparison with a benchtop scope
06:19 – Teardown and comparison with Analog Discovery 2
10:18 – Nice design touches https://digilent.com/blog/whats-different-with-the-analog-discovery-3/
12:01 – In operation using the Waveforms software
14:04 – Different product support and modes
16:25 – Highest resolution possible
18:12 – Lets feed it up it’s own clacker…
21:30 – Check THIS out! 23:30 – The Help system
24:51 – The Power Supply
27:08 – I can’t possibly demo all the features. Spectrograms, Persistence, Eye Diagrams, Histrogram, FFT’s
28:04 – OMG you can ramp and modulate the Power Suppply! Let’s try this…
32:24 – It’s useful, but not universally useful.
32:22 – The timebase scale is kinda annoying
34:41 – Adding NOISE to the PSU!
36:47 – Let’s SHORT this sucker…
38:49 – Have you tried turning it off and on again?
39:55 – Is this a bug?
40:49 – Dumb arse Dave
42:05 – Measurements
43:57 – Check this out!
44:40 – FFT
45:33 – 3D spectrogram
48:49 – Conclusion
Forum: https://www.eevblog.com/forum/blog/eevblog-1552-digilent-analog-discovery-3/

Looking at a Ukrainian Starlink dish PCB that was DESTROYED by shrapnel!
https://olegkutkov.me/
https://twitter.com/olegkutkov

https://radionavlab.ae.utexas.edu/wp-content/uploads/2023/01/starlink_structure.pdf
https://www.theverge.com/2021/11/11/22776563/spacex-starlink-rectangular-dish-router-mounting-internet-satellites
https://i.blackhat.com/USA-22/Wednesday/US-22-Wouters-Glitched-On-Earth.pdf
https://cdn.intechopen.com/pdfs/37016/InTech-Antenna_designs_with_electromagnetic_band_gap_structures.pdf
https://onlinelibrary.wiley.com/doi/epdf/10.4218/etrij.2017-0197

00:00 – Ukrainian Starlink dish PCB that was DESTROYED by shrapnel!
15:18 – Snaptron Solderable tactile PCB Domes https://www.snaptron.com/

Forum: https://www.eevblog.com/forum/blog/eevblog-1551-destroyed-ukrainian-starlink-pcb!-mailbag/

Teardown the new Keysight E36731A Battery Emulator & Profiler https://www.keysight.com/us/en/product/E36731A/battery-emulator-and-profiler.html

Forum: https://www.eevblog.com/forum/blog/eevblog-1550-keysight-e36731a-battery-emulator-teardown/

If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog

In this mailbag we take a look at some teardown artwork, USB power monitors, and a USB rechargeable multimeter.

Grid Studios Teardown artwork: https://gridstudio.cc/
FNB58 USB power monitor: https://s.click.aliexpress.com/e/_Dlc6MlJ
FNB48P: https://s.click.aliexpress.com/e/_DlifLtx https://ultraonedesign.com/
Fnirsi S1 Multimeter: https://s.click.aliexpress.com/e/_DC2hz2H

Forum: https://www.eevblog.com/forum/blog/eevblog-1549-mailbag-teardown-art-usb-power-and-multimeter/

00:00 – Mailbag
00:31 – Grid Studio Teardown artwork
06:06 – Fnirsi bonanza
07:46 – USB Power monitors FNB58 and FNB48P
12:01 – The uSupply makes another appearance
16:29 – UltraOne Design Binding post to Banana post adapters
19:32 – Fnirsi S1 USB Rechargeable Multimeter

If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog

The Moon Landing Hoax conspiricy theory BUSTED with Dave’s original proof.
Dave does something no one else has done before – compare the original Apollo 17 16mm ascent camera footage to the Lunar Reconnaissance Orbiter (LRO) photos. Will footage from 40 years apart match up to confirm the moon landing?

The Last Man On The Moon: http://amzn.to/2h1b6Xc
Audio Book: http://amzn.to/2uySy3X
Book: http://amzn.to/2uV67NB
LunarCognita Video: https://www.youtube.com/watch?v=7k28y1FL2TU
Inside & Outside footage: https://www.youtube.com/watch?v=XlGis35Epvs
NVIDIA moon landing proof: https://www.youtube.com/watch?v=O9y_AVYMEUs
Lunar Roving Vehicle Handbook: https://www.hq.nasa.gov/alsj/a16/A16OTM15-42.pdf
Third party evidence: https://en.wikipedia.org/wiki/Third-party_evidence_for_Apollo_Moon_landings
Apollo cameras: https://en.wikipedia.org/wiki/Apollo_TV_camera
Forum: https://www.eevblog.com/forum/blog/eevblog-1548-moon-landing-hoax-busted/

Digital logic circuit simplification using Karnaugh Maps. How to use a visual method to solve boolean algebraic equations and truth tables.

Part 5 of the digital logic design tutorial series.
Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHs2LwEdDwTp3n7mxb-MyBbo
Forum: https://www.eevblog.com/forum/blog/eevacademy-digital-design-series-part-5-karnaugh-maps/
00:00 – Part 5 of the digital logic design tutorial series
02:15 – Solving a logic truth table algebraically
04:17 – Verification of result By Inspection
06:27 – Maurice Karnaugh and drawing Karnaugh Maps
07:44 – The magic of Gray Code
08:51 – Mapping from Truth Table to Karnaugh Map
10:20 – The RULES for grouping 1’s
14:21 – Solving the Karnaugh Map usign Sum of Products
17:19 – 4×4 Karnaugh Map
20:06 – There is more than one solution
22:23 – Another example with overlapping groups

If you find my videos useful you may consider supporting the EEVblog on Patreon: http://www.patreon.com/eevblog

Part 3. Tour of the NASA Canberra Deep Space Communications Complex at Tidbinbilla, with Richard Stephenson https://twitter.com/nascom1

Links:
GaN solid state amplifier: https://ntrs.nasa.gov/api/citations/20190028651/downloads/20190028651.pdf Deep Space Network information https://descanso.jpl.nasa.gov/monograph/series10/03_Reid_chapt3.pdf https://descanso.jpl.nasa.gov/monograph/series10/04_Reid_chapt4.pdf https://descanso.jpl.nasa.gov/monograph/series10/05_Reid_chapt5.pdf
Air exclusion zone: https://www.avsef.gov.au/sites/default/files/2023-03/documents/nsw-act-nat_r430_tidbinilla_increase_in_transmitting_power_0.pdf
Maser amplifier: https://ntrs.nasa.gov/api/citations/19940025169/downloads/19940025169.pdf
X band uplink: https://ipnpr.jpl.nasa.gov/progress_report/42-87/87O.PDF
34M Beam Waveguide antenna: https://descanso.jpl.nasa.gov/monograph/series4/Mono4_Ch6.pdf https://descanso.jpl.nasa.gov/monograph/series4/Mono4_Ch7.pdf

Forum: https://www.eevblog.com/forum/blog/eevblog-1547-contacting-the-voyager-2-space-probe/

00:00 – Tour of the NASA Canberra Deep Space Communications Complex at Tidbinbilla
04:00 – Does the wind add any jitter?
04:29 – The new 34m Beam Waveguide Antennas
06:10 – The 400kW Klystron!
08:33 – Lunar Reconnaissance Orbiter tracking
10:34 – Upgrading Low Noise Amplifiers from Maser to MEMT
11:39 – LNA downconverters to 300MHz IF
12:14 – 1.1MW generator!
13:11 – How is this different to Parkes?
15:07 – Doppler shift
17:05 – Hydrogen Maser
18:00 – Why in a valley?
19:08 – Why worry about external RF?
20:09 – Transmit Mask
21:01 – The bearings
21:50 – Birds
22:29 – End of an Era for 70m dishes?
25:04 – Still the only game in town
26:15 – The original moon walk dish