EEVblog

By David L. JonesTechnology Education

EEVblog episodes

October 17, 2025 EEVblog 1714 – Presonus Eris Speaker REPAIR (Capacitor Pop Noise)
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)/
29 min
October 10, 2025 EEVblog 1713 – CRAZY Density Magnetic Core Memory from Space Shuttle!
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!/
17 min
October 10, 2025 EEVblog 1712 – CSIRO Mobile Space Mission Control Centre
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/
9 min
October 01, 2025 eevBLAB 133 – YouTube Just Self Destructed (AI Shorts Integration)
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)/
0 min
October 01, 2025 EEVblog 1711 – International Astronautical Congress IAC 2025 Walkaround
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/
54 min
October 01, 2025 EEVblog 1710 – Mailbag: Tennismatic, Breadboards, Books & Boost Converters
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 – Breadboard Bonanza!
26:42 – Junior Genius Electronic Learning Breadboad Kit
https://juniorgeniuskits.com/
Forum: https://www.eevblog.com/forum/blog/eevblog-1710-mailbag-tennismatic-breadboards-books-boost-converters/
30 min
October 01, 2025 EEVblog 1709 – Haasoscope Pro USB Oscilloscope: An Oscilloscope Oddity
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, it’s Mailbag, and is basically me documenting trying to sort out all sorts of issues.
Github: https://github.com/drandyhaas/HaasoscopePro
https://www.crowdsupply.com/andy-haas/haasoscope-pro
Forum: https://www.eevblog.com/forum/oshw/haasoscopepro-affordable-open-source-open-hardware-2-ghz-oscilloscope!/
47 min
October 01, 2025 EEVblog 1708 – What’s This SMD Part?
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/
9 min
September 10, 2025 EEVblog 1707 – REPAIR: Goal Zero Yeti 400 Lithium Battery
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 battery connections to make sure they are in parallel.
08:58 – The lithium ion battery pack
09:24 – Measuring the battery pack voltage, and the under voltage lookout protection
10:49 – Re-powering just the controller board
11:38 – Progressive system module power up with the battery, isolating the mains inverter
12:23 – Measuring the battery again to see if it’s accepting a charge
13:20 – Winner Winner Chicken Dinner
15:34 – No electronics repair needed
15:54 – Goal Zero battery physical design
17:03 – Back from the gym, what’s happened?
18:33 – Fault summary
22 min
September 05, 2025 EEVblog 1706 – K8 Wrist Worn Multimeter REVIEW
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/
18 min