EEVblog

New research shows you can extract a tiny voltage and current from a stationary tube in the earth’s magnetic field. Is this real? It is scaleable to be useful? Paper: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.7.013285 IEEE article: https://spectrum.ieee.org/decarbonized-future Forum: https://www.eevblog.com/forum/blog/eevblog-1680-free-energy-from-the-earths-magnetic-field/

Why does the Uni-T UTG9504T abitary function generator cost US$5800? A teardown and detailed BOM cost analysis of how much high end product designs costs, and the margins involved. Forum: https://www.eevblog.com/forum/blog/eevblog-1679-why-does-this-uni-t-awg-cost-$5800-bom-cost-analysis-458562/ 00:00 – Why does this Arbitrary Waveform Generator cost US$5800 ? 02:17 – 2.5x BOM Cost multiplier 03:02 – Teardown 06:02 – Power Supply …

53 minutes single take randomly walking the streets of Sydney with Mehdi from ElectroBOOM. That is all. Forum: https://www.eevblog.com/forum/blog/electroboom-stalks-sydney/

Oscilloscope have a pre-arm trigger period that can cause confusion if you aren’t aware of it. And how different scopes operate and indicate this in different ways. Also some potential bugs in the Keysight 3000 and HD3 series scopes. 00:00 – Slow timebases can be problematic for triggering 02:13 – What happens when you press …

An experiment to test an interesting effect with fuses. Forum: https://www.eevblog.com/forum/blog/eevblog-1677-an-interesting-effect-with-fuses-(experiment)/

Modifying a lab timer to automatically trigger when a fuses blows, for automated fuse testing. Fuses video: https://www.youtube.com/watch?v=WG11rVcMOnY Jellybean Transistors: https://www.youtube.com/watch?v=XYdmX8w8xwI Forum: https://www.eevblog.com/forum/blog/eevblog-1676-lab-timer-hack/

Our Ninja blender blade failed. For a warranty replacement they wanted us to DESTROY and DISPOSE OF the old perfectly working base unit before sending a new one. Let’s see about that… The first ever EEVBlog video with zero commentary, just memes. My breakfast smoothie: https://www.youtube.com/shorts/-2mf1mqZVQ0 Forum: https://www.eevblog.com/forum/blog/eevblog-1675-ninja-blender-repair-because-why-(right-to-repair)/ Credits: “Our Story Begins” Kevin MacLeod (incompetech.com) …

A big dumpster diving find! What did Dave score this time?

A quick follow-up to the JBL Partybox 310 speaker repair and speculation on WHY the fault happened the way it happened. Contains SPOLIERS, so watch Part 1 first! Forum: https://www.eevblog.com/forum/blog/eevblog-1672-jbl-repair-youll-never-guess-the-fault/

Repair of a JBL Partybox 310 speaker. Follow along as Dave goes down the repair rabbit hole. Try and guess the exact fault before Dave does, it’s a doozy! 00:00 – JBL Partybox 310 Speaker fault symptoms and initial failure speculation 02:57 – Teardown 06:23 – Is it a firmware lockup issue? 07:17 – Checking …

How can the same sh!t happen to the same guy twice? And a trap for young players with LCD’s. And a giveaway for the young whippersnapper in Australia. Forum: https://www.eevblog.com/forum/blog/eevblog-1670-bm786-multimeter-battery-leakage-repair-giveaway/ 00:00 – How can the same sh!t happen to the same guy twice? 06:27 – Zebra strip elastomeric connector 09:40 – It STILL doesn’t work? …

A mailbag replacement custom LED display for the Agilent U53131A VFD display frequency counter. www.hubequip.net Forum: https://www.eevblog.com/forum/blog/eevblog-1669-agilent-u53131a-vfd-to-led-display-upgrade-mailbag/

Horrific alkaline battery leakage in a rare prototype EEVblog 555 Multimeter. Can it be repaired? Forum: https://www.eevblog.com/forum/blog/eevblog-1668-horrific-alkaline-battery-leakage-in-rare-prototype-multimeter/

Reverse Engineering the Brymen BM2257 Multimeter front end to understand what changes have been made from the BM235 in the Low Z mode. DaveCAD time. Also some testing of the LowZ mode and how it works. Forum: https://www.eevblog.com/forum/blog/eevblog-1667-reverse-engineering-the-brymen-bm2257-multimeter/ MOV datasheet: https://www.cnr.com.tw/cloudSpace/CNR_D.pdf How to reverse engineer: https://www.youtube.com/watch?v=lJVrTV_BeGg Multimeter Input Protection: https://www.youtube.com/watch?v=zUhnGp5vh60

Let’s find out what this blown SMD part is, sent in by a viewer. Forum: https://www.eevblog.com/forum/blog/eevblog-1666-blown-smd-component-identification/ Component Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHtdQF-m5UFZ5GEjABadI3kI

Part 2 of the Keithley 2302 battery simulator repair of the VFD display. Just a follow-up on testing the actual VFD display itself to see if there is any fault that’s not the VFD vacuum. 00:00 – Having another look at the failed Newhaven VFD dispaly module 05:37 – Measurign voltages 07:32 – Oscilloscope probing …

Repair of a Keithley 2302 battery simulator with junk bin parts. But it did put up a fight! Teardown video: https://www.youtube.com/watch?v=5LK8wduZsy0 Forum: https://www.eevblog.com/forum/blog/eevblog-1664-repair-with-junk-bin-parts!-keithley-2302/ 00:00 – Faulty VFD display in a Keithley 2302 Battery Simulator 01:22 – Teardown 03:14 – The Display driver PCB 04:30 – Solder Sucking Sucks 05:26 – The VFD display module, a …

Repairing a customers Brymen BM786 multimeter, and investigating the cause of the InEr error message on the input jack alert feature. Plus a giveaway to a local youngster. 00:00 – A returned BM786 Multimeter with InEr error message 03:23 – Split jacks and input alert circuit 05:19 – In-Circuit probing TIP and Low Ohms mode. …

This was going to be a repair of a vintage Tandy 200 Portable Computer… Forum: https://www.eevblog.com/forum/blog/eevblog-1662-vintage-tandy-200-portable-computer-claytons-repairteardown/ 00:00 – I sear this Tandy 200 had a problem… 02:54 – Teardown 03:57 – The new BM2257 Multimeter 05:25 – I think it’s the buzzer 08:06 – Microscope teardown 16:20 – They don’t make service manuals like they …

The difference between Time Domain and Frequency Domain in AC circuit analysis. AC Theory Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHvD6M_7WeN071OVsZFE0_q- Forum: https://www.eevblog.com/forum/blog/eevblog-1661-ac-basics-tutorial-part-5-time-domain-vs-frequency-domain/