EEVblog

By David L. JonesTechnology Education

EEVblog episodes

June 25, 2024 EEVblog 1623 – Electronex 2024 Walkthrough
Walkthrough of the 2024 Electronex trade show in Sydney.
Forum: https://www.eevblog.com/forum/blog/eevblog-1623-electronex-2024-walkthrough/
42 min
June 17, 2024 EEVblog 1622 – Don’t Make This Multimeter MISTAKE
This is the biggest mistake beginners often make when using a multimeter ohms function.
A customer returned an EEVblog BM235 multimeter because it was “Faulty”
Was it? Let’s find out what happens when you try and measuse a CAN bus with a multimeter.
Forum: https://www.eevblog.com/forum/blog/eevblog-1622-dont-make-this-multimeter-mistake/
00:00 – Don’t measure a CAN bus with a multimeter!
01:50 – Trying different multimeters
05:21 – Oscilloscope CAN bus measurement
06:30 – BEWARE measuring resistors in-circuit
08:16 – Power supply voltage example
13 min
June 17, 2024 EEVblog 1621 – Mailbag: RadiaCode Radiation Monitor + LattePanda Mu Compute Module
More mailbag!
A look at the RadiaCode Radiation Monitor, and the LattePanda Mu Intel N100 Compute Module.
https://www.radiacode.com/
https://amzn.to/3yV5Gp4
https://www.lattepanda.com/lattepanda-mu
https://www.dfrobot.com/kit-004.html
Github: https://github.com/LattePandaTeam/LattePanda-Mu/tree/main/Electricals/Examples/%5BDFR1141%5DFull%20EVA%20Carrier%20for%20LattePanda%20Mu
Part 2: https://www.youtube.com/watch?v=UE_srZZdPjM
00:00 – Mailbag
00:30 – Radiacode 103 Radiation Detector & Spectrometer
07:48 – Teardown
14:09 – LattePanda Mu Intel N100 Compute Module
25:22 – Power up
Forum: https://www.eevblog.com/forum/blog/eevblog-1621-mailbag-radiacode-radiation-monitor-lattepanda-mu-compute-modu/
34 min
June 06, 2024 EEVblog 1620 – Deye Solar Hybrid Inverter EXTREME TEARDOWN
Extreme teardown of the Deye SUN-5K-SG04LP1 5kW hybrid solar inverter.
Will it contain the quality components claimed?
Also a topology reverse engineering of all the stages.
Hi-Res photos:
00:00 – A generous and coincidental donation from a viewer
00:37 – We have the brochure, let’s check the claims!
02:44 – Front panel PCB
03:46 – The gigantic heatsink
04:44 – Nippon Chemi-Con Capacitors? REALLY?
05:54 – Heatsunk and potted inductors and transformer teardown
10:19 – Main PCB’s and the confusing layout
12:53 – The fused battery input
13:37 – Are the MOSFET’s and IGBT’s as advertised?
15:10 – SMD high current links for PnP benefits
16:14 – Detailed circuit topology schematic reverse engineering
18:29 – Earth connection testing
19:07 – MOSFET vs IGBT
19:51 – Grid side IGBT switching and tri-level switching
20:46 – Solar Panels are capacitors to earth and that screws the CMRR
21:34 – HERIC switching topology and patent lawsuits!
23:50 – Grid and Load connections
25:07 – The battery bidirectional DC-DC converter
28:14 – H-Bridge and parallelism
30:14 – Switching drive stages
31:25 – Main processor PCB and a TI DSP ripoff?
32:51 – Redundant backup DSP controller?
34:40 – Genrator and Load conection relay switching
35:49 – Panasonic Relays? WHERE?
37:02 – User Connection PCB
38:25 – Conclusion
Datasheets:
https://www.fet.discoveree.io/datasheet.php?view=pdf&file=crmicro/crsq027n10n.pdf
https://www.magnachip.com/wp-content/uploads/2020/10/MBQ40T65QES-1.pdf
https://www.lcsc.com/datasheet/lcsc_datasheet_2209081730_Wuxi-NCE-Power-Semiconductor-NCE40TS120VTP_C5160411.pdf
https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2211151030_Vishay-Intertech-VS-EPX3007L-N3_C5263741.pdf
ADVchip DSP: https://file.elecfans.com/web2/M00/6F/21/poYBAGNEwS-AKpNeAIfcFmyDrAQ938.pdf
AVP32F335 DSP: http://advancechip.com/mobile/32fd/61.html
Fraunhofer ISE Successful in Patent Infringement Process for HERIC Inverter Technology:
https://www.ise.fraunhofer.de/en/press-media/press-releases/2022/fraunhofer-ise-successful-in-patent-infringement-process-for-inverter-technology.html
Forum: https://www.eevblog.com/forum/blog/eevblog-1620-deye-solar-hybrid-inverter-extreme-teardown/
42 min
May 28, 2024 EEVblog 1619 – Mailbag: Featuring Don McKenzie
More Mailbag!
00:00 – THE Don McKenzie! and a bonanza of embedded history
https://www.dontronics.com/jump-list.html
https://www.dontronics.com/First-pc.html
08:44- PBUFF prototype
18:38 – Photon, the world’s longest battery life camera (Open Source)
https://toaster.llc/photon/index.html
29:19 – Sanyo ICC-811 Mini Calculator from 1972
37:33 – Japanese Gadgets: USB to Bluetooth converter + USB Cable Tester
https://bit-trade-one.co.jp/
43:28 – Professional Electronic Design Best Practices Book
https://www.amazon.com/Professional-Electronic-Design-Best-Practices/dp/B0C1J56V97/
51:08 – Hoppes Brain MT-200 package adapter
https://hoppesbrain.com/
Forum: https://www.eevblog.com/forum/blog/eevblog-1619-mailbag-featuring-don-mckenzie/
56 min
March 16, 2024 EEVblog 1605 – Chasing Fart Noises – JBL Charge 3 “Repair”
Dave is chasing fart noises in this JBL Charge 3 waterproof speaker.
A teardown, and powerup on the bench to find the mysterious fart noises.
Will it get repaired, or will the fault do a Harold Holt?
Part 2: https://www.youtube.com/watch?v=u7sVGnrf0P0
Forum: https://www.eevblog.com/forum/blog/eevblog-1605-chasing-fart-noises-jbl-charge-3-repair/
00:00 – JBL Charge 3 Waterproof Speaker Fault
02:17 – Teardown
07:13 – Drivers
08:16 – Passive Radiators
09:58 – The Case Moulding
10:46 – Main PCB
11:36 – Under the microscope
15:30 – What’s this Power Rail doing?
18:07 – Power Rail Capture
20:16 – Are we chasing a red herring down a rabbit hole?
20:56 – Trying to capture the fault: Oscilloscope vs Microphone
22:22 – The Fault has done a Harold Holt
28 min
March 06, 2024 EEVblog 1604 – BEWARE! Multimeter Burden Voltage
Burden Voltage is a BIG trap with Multimeters, don’t get caught out!
A short video demonstrating the impact of Burden Voltage / Shunt Resistance on current measurement.
Mutlimeter Shunt Tutorial Part1: https://www.youtube.com/watch?v=jx0dryLmUEQ
Part 2: https://www.youtube.com/watch?v=xSEYPP5Xsi0
Forum: https://www.eevblog.com/forum/blog/eevblog-1604-beware-multimeter-burden-voltage/
7 min
March 06, 2024 EEVblog 1603 – Colas Wattway Solar Roadways is DEAD
The 1km Colas Wattway Solar Roadway in Normandy in France is finally being scrapped.
Press F in the chat.
€5M of taxpayer money down the drain. That money could have bought a 5MW commercial solar farm that produced 15 times the output power, and lasted decades longer.
Forum: https://www.eevblog.com/forum/blog/eevblog-1603-colas-wattway-solar-roadways-is-dead/
Reference links:
https://www.auto-moto.com/en-bref/cette-route-solaire-qui-a-coute-5-millions-d-euros-va-etre-demantelee-30624
https://actu.fr/normandie/tourouvre-au-perche_61491/on-s-attendait-a-rencontrer-des-problemes-la-route-solaire-de-tourouvre-au-perche-une-idee-pas-si-lumineuse_53438905.html
https://time.com/4616912/solar-panel-france/
https://www.theguardian.com/environment/2016/dec/22/solar-panel-road-tourouvre-au-perche-normandy
https://www.forbes.com/sites/johnparnell/2019/08/21/frances-solar-highway-was-always-a-road-to-nowhere/?sh=783cb5c971b6
https://www.wired.co.uk/article/france-solar-panel-roads
https://www.businessinsider.com/first-solar-road-france-failure-photos-2019-8
https://www.colas.com/en/innovation/greater-mobility-lower-impact/
https://mymodernmet.com/france-wattway-solar-road/
https://www.marketwatch.com/guides/solar/solar-farm-cost/#:~:text=Solar%20Project%20Size&text=At%20an%20average%20price%20of,the%20intention%20of%20selling%20electricity.
https://www.popularmechanics.com/technology/infrastructure/a28720252/french-solar-road-failure/
https://www.digitaltrends.com/cars/frances-first-ever-solar-panel-road-appears-to-have-some-serious-issues/
https://www.wattwaybycolas.com/en/references/photos.html
Technical specs: https://www.wattwaybycolas.com/media/documents/documents-en-anglais/dp-wattway-pack-gb.pdf
Map: https://www.google.com.au/maps/@48.5872378,0.647139,3a,75y,189.86h,63.17t/data=!3m6!1e1!3m4!1sRGiblnJFqgFm2wye5_F_1Q!2e0!7i16384!8i8192?entry=ttu
My previous videos on Colas Wattway:
https://www.youtube.com/watch?v=RjbKYNcmFUw
https://www.youtube.com/watch?v=rpwx-8s1M38
The near 18 year grift of Solar Freak’n Roadways:
https://www.startengine.com/offering/solar-roadways
00:00 – Colas Wattway Solar Roadways is DEAD
07:47 – Not even the biggest road construction company can make Solar Roadways work
08:32 – Even Colas admit it’s a failed concept
10:13 – How may homes can it power?
11:29 – How big a solar farm can you buy for €5M ?
13:16 – One final walk down the biggest solar roadway in the world
16:37 – What ever happened to Solar Freak’n Roadways?
0 min
March 05, 2024 EEVblog 1602 – Sony Amplifier REPAIR ADVENTURE
Repair of a Sony HCD-SBT20B Bluetooth Stereo. What it’s like to nail the repair and then, well come-a-gutsa and have to go down the rabbit hole to fix the fix all whilst battling bad design info.
How VFD displays work: https://www.youtube.com/watch?v=gZIRPJt69sM
Mud run video: https://www.youtube.com/watch?v=yAahT8_P-_E
Tektronix autopsy: https://www.youtube.com/watch?v=VZCokbsTwmQ
Forum: https://www.eevblog.com/forum/blog/eevblog-1603-sony-amplifier-repair/
00:00 – Sony HCD-SBT20B Bluetooth Stereo with a water ingress problem
01:17 – Water isn’t that bad actually, even mud.
02:49 – Comically long screwdriver time
04:09 – Vacuum Fluorescent display for all you VFD fanboys
05:10 – Annoying construction
06:14 – Logic level problem? Doesn’t seem to be the PSU.
07:57 – Yuck!
09:58 – PCB Cleaning time
12:11 – Did the cleaning work?
13:28 – Hang on, I think I see something…
14:36 – More corrosion
15:21 – Back to measuring voltages on the VFD
17:15 – Handy use of Auto Hold
18:00 – VFD dispaly under the microscope
19:33 – Cathode measurement
20:13 – Anode connection tracing
22:10 – I wouldn’t have designed it like this
23:08 – Sanity check
24:32 – What’s in the can?
28:16 – Schematic time. Sony service manuals are something else
33:22 – Don’t come-a-gutsa on dual diode pinouts
35:16 – Let’s power it up on the bench
37:19 – There’s something very strange about this…
40:04 – Oh FFS!
42:03 – Now it’ll work…
45 min
March 05, 2024 EEVblog 1601 – How VFD (Vacuum Fluorescent) Displays Work
How VFD (Vacuum Fluorescent) Displays Work.
Extracted from a hacking video #717: https://www.youtube.com/watch?v=clUVEyi_YNM
Forum: https://www.eevblog.com/forum/blog/eevblog-1601-how-vfd-(vacuum-fluorescent)-displays-work/
11 min