EEVblog

Today in the dumpster! Forum: https://www.eevblog.com/forum/blog/eevblog-1760-today-in-the-dumpster-(july-12th-2026)/

The 10th ACES hardware meetup in Sydney at Engineers Australia. All talks and open mics. https://luma.com/sydney-114f 00:00 – Engineers Australia HQ 03:19 – Intro 05:42 – Cibby Pulikkaseril from Zabidou https://www.zabidou.com/ 14:42 – Matt Crott from MAKO Aero – Prototype to Product https://mako.aero/ 25:28 – Panel discussion with Cibby, Matt and Brendan Hill from TEN13 Venture Capital https://www.ten13.vc/ 42:28 – Toby Tank from Onset, The Omnia Collective https://theonset.com.au/ 44:52 – An amazing demo of an omnidirectional semi-holographic display, the AndoTrope from Mike Ando! https://www.riumplus.com/ 50:06 – Student Tokamak nuclear reactor 52:31 – Ali and his DIY robot actuators 56:23 – Xtrainr fitness tracker hardware https://xtrainr.ai/ 59:18 – Startup robotics building vision system 1:03:37 – Haptic Virtual Reality Glove from On0 https://on0.com/ 1:07:56 – Brian, a Year 12 High School Student doing drone development 1:09:09 – Dropbear AI fast cloud AI models https://www.dreamscalelabs.com/ 1:11:58 – Robocup Junior https://junior.robocup.org/ 1:14:46 – Hot Take: Hardware isn’t hard 1:17:41 – Jim from Taylor Street Creative Space https://taylorstreet.space/ 1:23:01 – Student Robotics 1:26:36 – No Pizza For You! Forum: https://www.eevblog.com/forum/blog/eevblog-1759-aces-hardware-meetup-(startup-hardware-is-hard)/

A Greek Dumpster TV LED Backlight replacement Tragedy Forum: https://www.eevblog.com/forum/blog/eevblog-1758-a-greek-dumpster-tragedy/ 00:00 – Dumpster LG 4K TV backlight phosphor failure 02:34 – LED spectrum measurements 03:48 – Teardown 08:49 – LCD TV layers 09:36 – Come-a-gutsa 11:50 – Through the magic of Ali Express 14:49 – Replacing the LED strips 17:55 – Sagan discovers electric screwdrivers 19:31 – A Greek Tragedy

Sharp GF-7600 Boombox Repair Part 2 Electric Boogaloo Dismantling, cleaning and fixing the dodgy mains switch contact. Forum: https://www.eevblog.com/forum/blog/eevblog-1756-57-boombox-bodge-repair/

Bodge repairing THE boombox of the 1980’s, the Sharp GF-7600 for a 1980’s party.

2026 Electronex Show Walkaround Forum: https://www.eevblog.com/forum/blog/eevblog-1754-2026-electronex-show-walkaround/

Bart from Cleverscope returns to discuss and show off designing a 2000V isolated oscilloscope, and demonstrates measuring high voltage GaN transistors and Solid State Transformers. https://cleverscope.com/products/CS548 Forum: https://www.eevblog.com/forum/blog/eevblog-1753-designing-a-2000v-isolated-oscilloscope-(cleverscope)/

WTF were Texas Instruments thinking changing the design and major specs of the 45+ year old jellybean NE5532 audio opamp WITHOUT changing the part number?! New datasheet: https://www.ti.com/lit/ds/symlink/ne5532.pdf Old datasheet: https://www.mouser.com/datasheet/2/405/ne5532a-556776.pdf Change Notification: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5726/PCN20231114002.1.pdf Onsemi datasheet: https://www.onsemi.com/pdf/datasheet/ne5534-d.pdf Forum thread: https://www.eevblog.com/forum/chat/ti-ne5532-audio-opamp-changes/ OPI134: https://www.ti.com/lit/ds/symlink/opa4134.pdf 00:00 – TI have changed the classic jellybean NE5534 03:27 – Product Change Notifications (PCN’s) 06:43 – List of the changes 09:07 – Don’t worry abut that 600ohm load rubbish 10:45 – Let’s look at other manufacturers 12:50 – The OPA134 has a WILD change! 18:15 – They formally claim the changes have NO IMPACT! This could get them sued… 19:20 – Is the Single NE5534 impacted? 20:30 – This LMH6518 change might be killing oscilloscopes! 23:25 – Here is how it’s done: LM317 General forum related to this video: https://www.eevblog.com/forum/blog/eevblog-1752-wtf-texas-instruments-big-ne5532-changes/

5 different ways to measure phase angle on your oscilloscope. 00:00 – What is phase angle measurement? 01:48 – Automated measurement 06:38 – Cursor Measurement 12:24 – Graticule measurement 13:55 – Positive or Negztive? A trap for young players 14:50 – Another graticule method using horizontal shift 16:00 – How to increase horizontal measurement resolution 17:55 – Lissajous figure (X-Y mode) measurement 22:14 – Measure phase angle using Voltage? Yes, it’s possible! Forum: https://www.eevblog.com/forum/blog/eevblog-1751-oscilloscope-phase-measurement-masterclass/

More Mailbag! 00:00 – Linus Tech Tips Screwdrivers! https://www.lttstore.com/collections/ratcheting-screwdrivers https://www.lttstore.com/collections/precision-multi-bit-screwdriver 15:30 – Closer look at the screwdrivers 18:52 – Red Light Skin Therapy device 22:31 – Spectrum measurements 27:19 – EZABoard Arduino Learning Kit https://ezaboard.com/ Videos shot on 16mm film! https://odysee.com/@MatthewMulder:d 35:40 – Vintage Tek Museum CurveBug Curve Tracer Debugging Tool https://vintagetek.org/curvebug/ Forum: https://www.eevblog.com/forum/blog/eevblog-1750-mailbag/

Review of the Werewolf VFLEX USB-C power supply cable system. https://werewolf.us/collections/werewolf-products/products/vflex-3-pack-starter-kit Forum: https://www.eevblog.com/forum/blog/eevblog-1749-werewolf-vflex-usb-c-power-supply-adapters/

The dumpster really delivered today, with no less than FOUR 4K Retina display iMac’s! Plus a Nikon DSLR camera! Forum: https://www.eevblog.com/forum/blog/eevblog-1748-dumpster-imac-bonanza/

Demonstrating the difference between Schottky diodes and PN junction silicon diodes, and how your multimeter can influence your measurement when troubleshooting. Answering an interesting Twitter question. https://x.com/blind_via/status/2052223991839170919 https://www.tti.com/content/ttiinc/en/resources/blog/infographics/schottky-diodes.html https://engineering.purdue.edu/~ee606/downloads/ECE606_f12_Lecture17.pdf Forum: https://www.eevblog.com/forum/blog/eevblog-1746-schottky-vs-pn-diodes-measurement-traps/ 00:00 – Twitter question 01:21 – Recreating the problem 03:08 – Why doesn’t it read zero volts? Let’s try a PN junction diode 04:21 – Schottky vs PN Junction diodes, they are NOT the same! 06:06 – What about a diode tester? 07:15 – Why doesn’t the Schottky diode work like a diode? 08:39 – It’s a multimeter measurement TRAP! 10:37 – A closer look at Schottky diodes 14:21 – Datasheet inspection, and advantages vs disadvantages of Schottky diodes 15:21 – Reverse leakage current, PN vs Schottky 17:16 – THREE orders of magnitude difference! 22:29 – Digital vs Analog multimeter, Analog WINS!

A tribute to the 555 timer and Hans Caminzind, which turns 55 years old this year. Released on May the 5th, International 555 Timer Day at 5:55pm with a length of 5:55 And Dave demonstrates blowing out the birthday candle with his 555 Killer One Shot circuit. Use coupon code 555 for 5% off on the EEVblog store Hardware Store: https://eevblog.store/ https://spectrum.ieee.org/chip-hall-of-fame-signetics-ne555 https://www.righto.com/2016/02/555-timer-teardown-inside-worlds-most.html http://www.historyofelectronics.com/Much-Ado-About-Almost-Nothing.pdf Forum: https://www.eevblog.com/forum/blog/eevblog-1746-the-555-is-55-years-old!/

Testing the loudness of a new version of the BM2257 multimeter firmware using the CRY2851 Class 1 sound level meter. https://www.crysound.com/product/cry2851-sound-level-meter/ COUPON CODE: LOUD for 10% off the BM2257 Hardware Store: https://eevblog.store/ 00:00 – BM2257 Firmware changes 01:58 – Crysound CRY2851 Class 1 Sound Level Analyser 06:26 – Lab baseline dBA measurement 07:39 – dBA vs dBC vs dBZ weighting 08:51 – BM2257 Buzzer measurements 10:06 – Low frequency spectral analysis (How Low is Dave’s voice?) 11:00 – Designing and building a DIY acoustic test chamber 11:57 – BM2257 frequency spectrum analysis 14:04 – Different angle and distance repeat measurement 15:09 – Conclusion 17:26 – Bonus ventilation fan measurement Forum: https://www.eevblog.com/forum/blog/eevblog-1745-how-loud-is-the-continuity-tester/

The DP700 is Micsig’s third suck of the sav on a high voltage differential probe. Not to be confused with the MDP700 which this replaces. https://www.micsig.com/DPA/ 00:00 – Comparison to the DP10007 and MDP700 03:58 – Unboxing of the DP700 05:52 – CMRR measurement hardware setup 09:52 – Sanity check gain and bandwidth check. 11:29 – Zero function 12:25 – Measuring the CMRR 16:30 – Trap for young players. RMS vs AC RMS, it’s all in the sigma 17:44 – Another trap for young players, double sigma 19:07 – CMRR at 100MHz 22:41 – Real world test on a 100V GaN MOSFET 25:28 – Teardown 29:44 – PCB inspection Forum: https://www.eevblog.com/forum/blog/eevblog-1744-new-micsig-dp700-high-voltage-differential-probe/ Teardown photos:

Dave shows you how to use your oscilloscope probe to detect mechanical vibrational modes on your PCB. And shows off the Crysound Acoustic Imaging Camera! https://www.kickstarter.com/projects/pocket-acoustic-cam/crysound-pocket-acoustic-imaging-camera/ Forum: https://www.eevblog.com/forum/blog/eevblog-1743-mechanical-vibration-detection-with-your-oscilloscope-probe/

More Dumpster Diving. What did we score today? Forum: https://www.eevblog.com/forum/blog/eevblog-1742-today-in-the-dumpster-room/

More amazing Mailbag! 00:00 – BOOK Professional Electronic Design Best Practices, Volume II 06:01 – A Crusty Nautalytics Simple Compass 11:46 – DPS DIN Power Supply Modules https://digitalpowersystems.eu/hdr20/ USB-AC-PD 20:22 – The Book: The Ultimate Guide to Rebuilding a Civilization Forum: https://www.eevblog.com/forum/blog/eevblog-1741-mailbag/

Looking at a dumpster diving Dell laptop HAUL! with Sagan! Forum: https://www.eevblog.com/forum/blog/eevblog-1740-dumpster-diving-dell-laptop-haul!/

The Beelink EQR6 Ryzen 9 Mini PC mysteriously failed after an upgrade, why? 00:00 – This Beelink EQR6 failed just after an upgrade, WHY? 02:28 – Is is the flat flexes? 04:45 – Woah, what’s THIS? 07:17 – Nooooooooo! It can’t be… Forum: https://www.eevblog.com/forum/blog/eevblog-1739-unusual-fault-in-a-beelink-ryzen-9-mini-pc/

Everyone’s favorite Solar Roadway, the OG Solar Freakin’ Roadways is still going strong with NEW EQUITY FUNDING! WeFunder: https://wefunder.com/solar.roadways.incorporated StartEngine: https://www.startengine.com/offering/solar-roadways US Army contract: https://www.highergov.com/contract/W5170122C0119/ Forum: https://www.eevblog.com/forum/blog/eevblog-1738-solar-freakin-roadways-new-funding!/

A chat with Alex Lidow, the inventor of the original Power MOSFET and HEXFET at International Rectifier. Former CEO of International Rectifier (founded by his father!), and now Founder & CEO of EPC (Efficient Power Conversion) that make the most efficient GaN FET’s on the market. https://epc-co.com We cover everything from inventing the power MOSFET on his first day on the job to silicon physics and AI data centres and humanoid robots. 00:00 – Alex Lidow 05:08 – What’s the definition of an Engineer? 06:07 – Inventing the Power MOSFET 400V/1ohm first day on the job with Tom Herman 09:16 – The flash of brilliance: Inject charge into the region 10:36 – Steve Wozniak and the Apple IIE PSU 12:02 – IRF100 and IRF130 HEXFET 14:18 – 42 Competitors! 15:54 – Major Innovations in MOSFET’s 17:00 – CoolMOS from Siemens 18:23 – TrenchMOS from Vishay 19:17 – Silicon Carbide started as a diode 21:46 – 2D Electron Gas (2DEG) 24:40 – Silicon MOSFET game is won by the deepest pockets 25:09 – Getting fired from IR and starting Starting EPC 26:28 – Get that damn Gallium out of my Silicon fab! 29:31 – Integrated GaN Solutions 31:03 – The physics of Radiation Hardening in MOSFET’s 34:23 – The market for high voltage transistors 36:00 – The 200V and under MOSFET market is performance driven 39:13 – Protecting Patents in China is EASIER than in the US! 41:41 – AI Data centres and NVIDIA modules 44:46 – 800V AI power module architecture 47:42 – Multi level DC-DC topology ISOP 49:46 – Frequency trade-off in LLC DC-DC converter design 56:13 – Humanoid robots 58:16 – What is the most popular GaN? 59:24 – Buyouts? 01:00:36 – Evaluation Boards 01:03:34 – Darkening the digital sky Forum: https://www.eevblog.com/forum/blog/eevblog-1737-alex-lidow-inventor-of-the-power-mosfet/

What are the TOP 5 Jellybean MOSFET’s? 00:00 – MOSFET vs BJT 02:21 – What is a Jellybean? 04:14 – 2N7002 N-Channel wimpy generic 13:10 – BSS84 P-Channel wimpy generic 14:47 – AO3400 N-Channel SOT-23 21:30 – Continuous Current vs Pulse Current Rating and SOA Graph 24:15 – AO3401 P-Channel SOT-23 25:56 – AO4410 N-Channel SO-8 High Current 30:10 – AO4407 P-Channel SO-8 High Current 31:18 – IRLML2502 N-Channel Low Gate Voltage 33:51 – IRLML6401 P-Channel Low Gate Voltage 34:15 – IRLZ44 N-Channel Big Package 37:21 – IRF510 Special Mention 37:37 – IRF4905 P-Channel Big Package Jellybean Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHtdQF-m5UFZ5GEjABadI3kI Forum: https://www.eevblog.com/forum/blog/eevblog-1736-top-5-jellybean-mosfets/

Nobody truly understands the complexity of modern supply chains for the technology we take for granted. How the AI supply chain works, from ChatGPT to sugercane https://aisupplychain.vercel.app/ https://x.com/chiefofautism Forum: https://www.eevblog.com/forum/blog/eevblab-138-you-dont-understand-supply-chains!/

How to measure DC power rail high bandwidth waveforms with the offset control on your oscilloscope. Active Probes, Passive Probes, Z0 probes, and specific DC Power Rail Probes are compared. 00:00 – How to measure power rails with Active Probes and Power Rail probes 08:03 – Signal Skew 09:54 – 10:1 Passive Probe 10:18 – Example of an 8 bit scope with no offset adjust 10:39 – Trap for young players. Input referred offset. 12:41 – Cheap DIY Z0 Probe 14:41 – Offset range changes based on V/div, don’t be fooled. 16:48 – Rigol Scopes 17:20 – Siglent Scopes & How models differ 18:53 – Why the complete opposite between Keysight/R&S and Rigol/Siglent? PRP1: https://www.eevblog.com/forum/testgear/prp1-low-cost-2ghz-power-rail-probe/ Power Rail Probe DIY project in Silicon Chip: https://www.siliconchip.com.au/Issue/SC/2025/November Forum: https://www.eevblog.com/forum/blog/eevblog-1735-oscilloscope-dc-offset-explained/

The Uni-T UT892 High Voltage Multimeter is unusually rated to 2000V! Teardown and testing time, is it any good? 00:00 – Uni-T UT892 2000V High Voltage Multimeter 02:39 – Unboxing 03:40 – FAIL right off the bat! Probes matter. 05:53 – Teardown 08:06 – Where’s the MOV’s? 09:07 – The case design leaves a lot to be desired 09:23 – PCB switch contact side 09:44 – Houston, we have a clearance problem. 11:20 – It’s going in unprotected 13:08 – The case sucks 13:56 – High Voltage testing within range 15:15 – What’s up with this NCV tester? 16:48 – Do we care about the autoranging and continuity tester at this point? 17:35 – 2500V test 19:05 – 5000V test! 21:03 – Inspection + chipset 21:26 – 5000V test again with cover off 22:20 – What a surprise! It failed exactly where I said it would. 23:25 – Proper high voltage design 24:50 – Conclusion Forum: https://www.eevblog.com/forum/blog/eevblog-1734-uni-t-ut892-2000v-high-voltage-multimeter-tested/

More mailbag! 00:00 – Vetus Pars Retro Chip Tester https://retrotroniks.com/product/vetus-pars-retro-chip-tester/ 17:05 – PRP1 2GHz Power Rail probe https://www.eevblog.com/forum/testgear/prp1-low-cost-2ghz-power-rail-probe/ 22:07 – PRP1 Teardown 24:10 – PRP1 Circuit Explanation 27:08 – PRP1 Testing 32:09 – Comparison with Agilent 2GHz Active Probe Forum: https://www.eevblog.com/forum/blog/eevblog-1733-mailbag-2ghz-power-rail-probe-retro-chip-tester/

How much capacity has this 20+yo 1000+ cycle Panasonic 14500 lithium ion battery lost? 00:00 – Panasonic electronic shaver teardown 06:30 – Battery dimensions match the type number 08:24 – The battery capacity test setup 10:40 – 500mA Constant Current test 11:38 – How much energy is left in a “flat” battery? 13:46 – 250mA Constant Current test 14:54 – 100mA Constant Current test 15:13 – Results analysis. Talking head Dave 19:11 – How to scale time in Excel 21:20 – How to get a characteristic battery capacity graph in Excel 24:35 – Energy in a battery and the characteristic curve area, it’s just an integral 26:30 – Optimising product design and battery cutoff voltage 29:13 – Battery current measured Forum: https://www.eevblog.com/forum/blog/eevblog-1732-20yo-1000-cycle-panasonic-li-ion-battery-tested/

The $50 Ziboo 17B Pro 1500V Multimeter vs the $150 Fluke 17B MAX Is it any good? Forum: https://www.eevblog.com/forum/blog/eevblog-1731-$50-ziboo-17b-pro-multimeter-vs-$150-fluke-review/

Part 8 of the AC Basics tutorial series. Looking at the difference between Apparent, Reactive, and Real Power. Plus Power Factor 00:00 – Voltage & Current phase relationship 02:28 – Real Power 07:09 – Apparent Power 12:02 – Power transmission systems and copper losses 17:45 – Reactive Power 20:17 – It’s all a Fugazi, it doesn’t exist 21:52 – Power Triangle 23:46 – Power Factor AC Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHvD6M_7WeN071OVsZFE0_q- DC Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHtVLq2MDPIz82BWMIZcuwhK Forum: https://www.eevblog.com/forum/blog/eevblog-1730-ac-basics-tutorial-part-8-apparent-reactive-real-power/

Ohms law applied to AC. AC Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHvD6M_7WeN071OVsZFE0_q- Forum: https://www.eevblog.com/forum/blog/eevblog-1729-ac-basics-tutorial-part-7-ac-ohms-law/

Part 6 of the AC basics tutorial video series, covering Impedance, Conductance, Susceptance, and Admittance. 00:00 – AC Tutorial Series Part 6 00:56 – Impedance 07:32 – Reactance vs Impedance 08:17 – Conductance 11:21 – The Fluke 87V measures conductance! 12:12 – Susceptance & Admittance 13:53 – Tying it all together AC Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHvD6M_7WeN071OVsZFE0_q- Forum: https://www.eevblog.com/forum/blog/eevblog-1728-ac-basics-tutorial-part-6/

Simple repair of a Casio CT-X700 keyboard, with Sagan, and some really bad music. Forum: https://www.eevblog.com/forum/blog/eevblog-1727-repair-casio-ct-x700-keyboard/

Repairing a failed EV charger DC-DC converter had an unusual twist. Forum: https://www.eevblog.com/forum/blog/eevblog-1726-repair-of-an-ev-charger/

Sagan joins Dave to open more packages, in everyone’s favorite segment Mailbag. 00:00 – The Connector Book! by Davide Andrea https://connectorbook.com/ Listen to Davide on The Amp Hour: https://theamphour.com/708-all-the-connectors-with-davide-andrea/ 11:02 – BLE CaberQu USB-C cable tester https://caberqu.com 22:02- Teardown of the CaberQu 24:22 – Snaptron FREE Sample Box https://www.snaptron.com/free-samples/sample-box/ 24:55 – Sagan’s Knife Skills! 32:10 – Elecrow CrowPanel Pi Terminal https://www.elecrow.com/pi-terminal-7-1024-600-ips-hmi-panel-all-in-one-module-raspberry-pi-cm4-industrial-computer-with-rich-interfaces.html Forum: https://www.eevblog.com/forum/blog/eevblog-1725-mailbag-with-special-guest-sagan/

Teardown of the classic Australian Made BWD 603B Minilab that was saved from the UTS dumpster. Schematic: Forum: https://www.eevblog.com/forum/blog/eevblog-1724-bwd-603b-minilab-retro-teardown/

Review of the AlienTek DM40 Multimeter/Oscilloscope 00:00 – Alientek DM40C Multimeter and Oscilloscope 02:12 – Unboxing 03:51 – What’s with the rotating tilting bail? 06:15 – Power on 08:53 – The Trend Chart is really nice 10:19 – Online/Offline mode, what IS this? 11:58 – Banana jacks please 12:07 – Megaohms interference issue 13:20 – Autoranging speed & Continuity & Diode 14:08 – No AutoHold 14:31 – Isolated inputs? 14:58 – Calibration checks 16:52 – Capacitance interference? 18:37 – Relative mode 19:10 – Colour LCD inside and outside 20:04 – Temp is a bit off 20:15 – No internal recording 20:53 – Reading memory 22:02 – Oscilloscope functionality 26:28 – Function Generator 28:46 – FFT 29:09 – Bluetooth functionality 31:33 – Three Finger Screen Shot 32:31 – It’s got magnets! 32:51 – Teardown 37:56 – Analog front end 38:46 – Power consumption measurement 39:03 – PCB inspection talking head 45:08 – Conclusion Forum: https://www.eevblog.com/forum/blog/eevblog-1723-alientek-dm40-multimeteroscilloscope-review/

Re-telling of a manufacturing hardware war story talk I gave at a recent hardware meetup in Sydney. https://luma.com/Sydney-hardware-meetup?k=c How a simple manufacturing change cost a company millions of dollars. 00:00 – Sydney Hardware Meetup 01:16 – Seismic Oil Survey Exploration: How to find oil 03:29 – Seismic survey vessels are HUGE! 04:25 – Solid Towed Array Streamers 05:56 – On the back deck of the ships 06:33 – Leading edge low noise 24bit ADC’s 07:23 – Hydrophone module construction 09:33 – The actual war story – Continuous Improvement… 14:12 – It CAN’T be that, it’s impossible… 16:58 – Field repair wasn’t easy… Forum: https://www.eevblog.com/forum/blog/eevblog-1722-manufacturing-hardware-war-story/

Qualcomm have bought out Arduino, and several weeks later have altered the Terms & Conditions. Dave does a deep dive of the changes. https://www.arduino.cc/en/terms-conditions/ https://web.archive.org/web/20250912221625/https://www.arduino.cc/en/terms-conditions/ 00:00 – Qualcomm have acquired Arduino. I’ve got a bad feeling about this… 01:02 – How much did they pay for Arduino? 02:54 – They have changed the Terms And Conditions 03:54 – Arbitration Disputes 04:21 – Kids? Bugger off! 05:11 – Are they now restricting reverse engineering? 06:35 – Irrevocable! Give us everything, forever. 07:08 – Revocable! We can take away your stuff. 08:26 – No competition for you! 09:46 – Patents 10:25 – Export & Trade Compliance. No selling to naughty people. 11:10 – For Personal Use Only 11:36 – Changes to the Changes. We can shut it all down. 12:24 – We can suspend your account 12:49 – Arbitration blah blah 13:31 – LibreDuino Forum: https://www.eevblog.com/forum/blog/eevblog-1721-rip-arduino-(new-tc-deep-dive)/

More mailbag! 00:00 – Biggest mailbag load EVER. Too much random vintage USSR stuff to list… 26:24 – Logicgat Digital Logic training board. https://logicgat.es/ 31:22 – SLogic16U3 $69 USB3 800MHz Logic Analyser https://wiki.sipeed.com/hardware/en/logic_analyzer/slogic16u3/Introduction.html Forum: https://www.eevblog.com/forum/blog/eevblog-1720-mailbag-ussr-bonanza-logic-training-$69-logic-analyzer/

Expanding the AERL home storage battery from 25kWh to 75kWh! Also replacing the 5kW Deye hybrid inverter with an 8kW Solis hybrid inverter. And installing a changeover switch to power most of the house from the Backup port in the new inverter. https://www.aerl.com.au/products/life2-battery https://www.thomsonenergy.com.au/ Solis s6-eh1p8k-l-plus-au https://www.solisinverters.au/uploads/files/202506/Solis_Manual_S6-EH1P(3-8)K-L-PLUS_AU_V1,1(20250530).pdf Forum: https://www.eevblog.com/forum/blog/eevblog-1719-75kwh-home-storage-battery-expansion/ 00:00 – 75kW Battery Expansion 05:11 – The new AERL 10 way outdoor battery cabinets 07:28 – New Solis 8kW Hybrid Inverter 08:27 – 70sqmm DC battery cable 09:22 – New Changeover switch + New 10sqmm cable run 10:19 – The old 25kWh rack 11:03 – New grid side energy meter 12:03 – Wire strippers or Pliers? 14:10 – Can you get an entire system for free? 14:45 – 70sqmm wire crimping 15:36 – Dave’s spidey sense kicks in 16:09 – Trick of the Trade: Bending PVC piping 17:00 – Always trust Dave’s spidey sense 17:17 – Nighttime install! 22:02 – RJ45 termination in the dark 23:18 – First test, something seems wrong… 26:17 – Nest morning troubleshooting 28:52 – It’s always the current clamp 31:19 – Switchboard upgrade with Changeover switch 33:32- Stress testing the Solis backup port

What use is a 1GHz oscilloscope if it doesn’t have a high frequency active probe interface? Well, there are several options including a cheap $5 DIY resistive probe. Practical demonstration of active FET probing vs Passive Probing vs DIY Resistive probing. A lot of material extracted from videos 1367 and 1368 Forum: https://www.eevblog.com/forum/blog/eevblog-1718-is-a-cheap-1ghz-oscilloscope-useless-($5-diy-1ghz-resistive-prob/ 00:00 – What use is a cheap 1GHz oscilloscope if it doesn’t have an active probe interface? 02:30 – Capacitive reactance and tip capacitance 03:55 – High bandwidth passive probes 04:59 – Active FET probes to the rescue, right? 07:54 – DIY $5 1GHz Resistive probe 09:02 – DIY resistive probe explained 13:33 – Active FET probe example: Poor Grounding vs Good Grounding 19:02 – $5 DIY Resistive probe vs $3k Active FET probe 19:48 – What’s going on here? The downside of resistive probes. 21:10 – Resistive probes are more tolerant of grounding 25:08 – Conclusion

Rigol have released the new MHO900 series mixed signal oscilloscope. For $999 entry level MHO934 you get 4CH 350MHz 12 bit at 4Gs/s, this is insane! Teardown of the special edition 1GHz MHO98 (still only $1399!) https://www.rigol.com/intl/products/oscilloscope/MHO900.html https://www.rigolna.com/products/digital-oscilloscopes/mho900/ In Australia: https://emona.com.au/quick-links/rigol/ 00:00 – Special Limited Edition MHO98 01:07 – DHO900 vs MHO900 03:06 – Is there another 350MHz scope for $999? 04:48 – Teardown 07:15 – Dual 100MHz AWG PCB 08:23 – 1GHz front end 09:44 – Custom ASIC ADC 13:02 – Impressive assembly minimisation 14:07 – Back the main PCB 16:35 – Why the front end shields are not soldered is kinda smart 17:50 – What has Dave screwed up? 19:57 – Dumb arse Dave does it again 20:42 – Bootup 22:21 – Power consumption measurement 22:39 – Front end PCB analysis 26:04 – The acquisition ASIC is not what it seems… 27:31 – Can anyone else touch this price touch? Analysis of other brands. 33:28 – Web interface and basic bandwidth checks 37:17 – Trigger jitter issue with multiple channels? 39:42 – Conclusion Forum: https://www.eevblog.com/forum/testgear/rigol-mho98-and-mho900-oscilloscope-series/

A viewer went dumpster diving at the University of Technology and found some classics. Teardown and playing with a Kikusui DSS5040 Analog/Digital Storage scope. Plus a classic Australian BWD 603B Mini-Lab Manual: https://www.eevblog.com/files/Kikusui_DSS5040_E.pdf 00:00 – University Dumpster diving time! 02:46 – Kikusui DSS5040 Analog/Digital storage oscilloscope 07:12 – Teardown 10:51 – Power On 17:14 – Digital Storage Mode 21:24 – Conclusion Forum: https://www.eevblog.com/forum/blog/eevblog-1716-university-dumpster-diving-kikusui-oscilloscope/

Swiss company Euler Precision have a new 3GHz active probe on Crowd Supply, let’s take a look. https://www.crowdsupply.com/euler-precision/esap-30 00:00 – The Euler Precision eSAP-30 Active Probe 01:26 – The problem with passive probes, Capacitance Reactance 03:31 – Unboxing 05:55 – Open Source? 06:46 – It’s all about the probe accessories 08:08 – Measurement report 10:02 – Real world measurement using Keysight reference probe 11:57 – Testing the Euler probe with a flat flex probe interface 13:13 – Let’s probe it even better… 15:55 – Noise comparison test 16:09 – Teardown 19:26 – 700MHz passive probe comparison 20:48 – Conclusion Forum: https://www.eevblog.com/forum/blog/eevblog-1715-euler-precision-esap-30-3ghz-active-probe-review/

Classic intermittent “popping” noise from this Presonus Eris 5 studio monitor speaker. Electrolytic Capacitors are suspect number one. 00:00 – Faulty Presonus Eris 5 speaker. Classic “popping” sound. 03:48 – Teardown 07:16 – Testing for popping again 07:36 – Testing for hiss 08:32 – Rectified voltage testing 09:34 – Woah, that’s that? 10:26 – Getting the PCB out 10:55 – A look at the PCB under the microscope TAD7294: https://www.st.com/resource/en/datasheet/tda7294.pdf 13:15 – Missing parts 14:39 – Removing the capacitors 16:00 – Measuring the main filter capacitors 17:14 – The Preamp PCB 18:08 – What is the most likely culprit? 20:21 – In-circuit ESR testing 21:32 – All new capacitors 24:15 – Soldering in new caps and testing 25:38 – What did I goof? 27:57 – Conclusion Forum: https://www.eevblog.com/forum/blog/eevblog-1714-presonos-eris-speaker-repair-(capacitor-pop)/

A look at the crazy ferrite core density in the Ampex 1600 16k x 18 bit word magnetic core memory from Ampex Memory Products Division, used in the Mitra 125S computer for the Spacelab program on the Space Shuttle. 00:00 – Magnetic core memory 01:52 – How magnetic core memory works 07:12 – Ampex high density 16Kword core memory Magnetic core simulator: https://nationalmaglab.org/magnet-academy/watch-play/interactive-tutorials/magnetic-core-memory/#:~:text=Magnetic%20core%20memory%20was%20developed,electric%20current%20in%20a%20circuit. Forum: https://www.eevblog.com/forum/blog/eevblog-1713-crazy-density-magnetic-core-memory!/

A tour inside the brand new CSIRO Mobile Mission Control & Operations Centre, built inside a b-double truck. Dr Mark Dunn gives us a tour of the new fitout. https://research.csiro.au/moc/ Purpose-built, the b-double trailer deploys into a fully operational mission control centre that can accommodate up to 30 mission operators, each supported by configurable multi-monitor stations and mission-status displays. Onboard, satellite, 4G, integrated radio and vibration-tolerant servers ensure connectivity, even in remote locations. The mobile Mission Operations Centre is powered by a battery-backed solar system with generator fallback, enabling sustainable, off-grid operation across Australia’s geographically dispersed launch sites. Forum: https://www.eevblog.com/forum/blog/eevblog-1712-csiro-mobile-space-mission-control-centre/

YouTube have just released new AI video Shorts features built into the Youtube app itself. Let’s create an AI slop Short in minutes using Veo 3 and see what fresh new hell you’re in for on Youtube. If you thought AI slop was already bad enough on Youtube, it’s just leveled up. https://aardvark.co.nz/daily/2025/0918.shtml Forum: https://www.eevblog.com/forum/blog/eevblab-133-youtube-just-self-destructed-(ai-shorts)/