EEVblog

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 …

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 …

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 …

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 …

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 …

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 …

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 – …

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 …

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 …

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 …

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- …

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 …

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 – …

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 …

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 …

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 …

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 – …

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 …

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 – …

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 …

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 …

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 …

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 …

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)/

A walkaround of the show floor of the International Astronautical Congress IAC 2025 in Sydney Forum: https://www.eevblog.com/forum/blog/eevblog-1711-international-astronautical-congress-iac-2025-walkaround/

More mailbag! 00:00 – Tennismatic saw my repair video! 03:23 – Stickers 04:34 – Offerman Industries DC-DC Boost Converter Datasheet: https://www.omnionpower.com/assets/pdfs/windchill/data-sheet/abxs001_ds.pdf https://offerman.industries/products/32-54v-adjustable-output-dc-dc-step-up-boost-converter-8-16v-wide-input-65w-output 05:59 – Bypass Capacitors in Parallel? 07:51 – Sexy clear solder mask 11:25 – Load Testing https://www.covingtoninnovations.com/ https://juniorgeniuskits.com/ 16:35 – Book: Electronic Experiments for Young Learners 21:52 – All Hail Wago Connectors 22:05 …

Was supposed to be a regular mailbag with multiple items, but this Haasoscope Pro was a 1.5hrs of raw footage adventure I have edited down to 45min, warts and all. So no other items, just this. TLDR; This open source 2GHz 3.2GS/s USB Oscilloscope needs a lot of work… This is not a full review, …

Another viewer question, can we identify this SMD component? https://x.com/Joostnietsmeer/status/1967941676061823401 Forum: https://www.eevblog.com/forum/blog/eevblog-1708-whats-this-smd-part/

Dave’s Goal Zero Yeti 400 lithium ion battery failed. Repair time. Forum: https://www.eevblog.com/forum/blog/eevblog-1707-repair-goal-zero-yeti-400-lithium-battery/ 00:00 – Goal Zero Yeti 400 Battery failure 01:32 – Hiccuping 03:28 – Teardown 04:47 – Failure hypothesis and potential solution 05:37 – The mains inverter PCB 06:43 – The control PCB 07:36 – Dual battery connectors 08:09 – Measuring the dual …

Is a wrist worn multimeter actually useful? A review of the CZDANG K8 https://s.click.aliexpress.com/e/_opDFvin Use coupon code “doesntsuck” for 10% off the EEVblog 1980s pocket multimeter EEVblog 1980s Pocket Multimeter Forum: https://www.eevblog.com/forum/blog/eevblog-1706-k8-wrist-worn-multimeter-review/

The world’s first desktop personal computer wasn’t the Apple 1 or the Altair 8800. It wasn’t even the HP 9100A, it was the Olivetti Programma 101 from 1965! Computer Teardowns don’t get much more vintage than this. Forum: https://www.eevblog.com/forum/blog/eevblog-1705-the-worlds-first-desktop-computer-teardown/ Links: http://www.oldcomputers.arcula.co.uk/calc3.htm https://bellini.it/portfolio-articoli/mario-bellini-designer/ http://www.curtamania.com/curta/database/brand/olivetti/olivetti%20programma%20101/index.html https://ub.fnwi.uva.nl/computermuseum/delayline.html https://ub.fnwi.uva.nl/computermuseum/p101dl.html https://avvocatostella.com/wp-content/uploads/2015/12/Il-primo-personalcomputer-lOlivetti-La-Programma-101.pdf https://www.oldcalculatormuseum.com/c-programma101.html https://www.fondazioneadrianolivetti.it/en/p101-cecam/ https://www.inexhibit.com/case-studies/olivetti-programma-101-at-the-origins-of-the-personal-computer/ https://forum.vcfed.org/index.php?threads/olivetti-programma-101-documentations-and-experiences.1239428/ https://handwiki.org/wiki/Engineering:Programma_101 Service manual: https://vintagecomputer.ca/files/Olivetti/Programma%20101/repair/RepairManualP101.pdf Reference …

WTF is this design? The ANENG 626 Smart Multimeter Forum: https://www.eevblog.com/forum/testgear/aneng-626-multimeter-hell/ 00:00 – ANENG 626 Unboxing 02:14 – Charging + USB isolation test. CAT III 600V LOL 03:32 – Power on and UI 05:20 – UI Design Hell + Chocolate Wheel mode. Every child wins a prize! 06:26 – Continuity mode 07:13 – Screen angle …

A repair of this Tennismatic T1000 remote control was way more interesting than I expected. https://tennismatic.com/main/page_products_ball_machines_t100_series.html Forum: https://www.eevblog.com/forum/blog/eevblog-1702-a-most-interesting-repair/ 00:00 – Tennismatic 1000 Tennis ball machine remote control 00:53 – Battery snap ohms measurement 01:17 – Battery current measurement 02:29 – It’s a row/column thing 02:57 – Teardown 05:20 – Membrane inspection 06:44 – Membrane keypad …

The $599 Moku:Go from Liquid Instruments is an Australian designed and manufactured USB/Ethernet/WiFi instrument, with 14 instruments in 1, and a 4 channel power supply. Oscilloscope, Voltmeter, Logic Analyser, Waveform generator, Frequency Response Analyser, Lock in Amplifier, Laser Lock Box, Spectrum Analyser, PID Controller, Digital Filter, FIR Filter Builder, Data Logger, Pattern Generator. https://liquidinstruments.com/products/hardware-platforms/mokugo/ 00:00 …

Part 1 of the µTimer project, a versatile benchtop lab timer. Choosing the LCD, and getting two sample LCD’s running. One using a demo board, and one that needed to be hacked onto a Raspberry Pi. 00:00 – Benchtop Lab Timer Project 01:19 – It’s all about the choice of LCD 03:14 – ERC19624-1 192×64 …

I scored this GW Instek APS-7050 Precision AC Power Source on Ebay, let’s check it out. Forum: https://www.eevblog.com/forum/blog/eevblog-1698-awesome-ebay-ac-power-source-gw-instek-aps-7050/