EEVblog No Script, No Fear, All Opinion

A follow-up to the previous video showing the complex AC impedance answer to the OpAmp exam question. Part 1: https://www.youtube.com/watch?v=nDEGqme5Z4g https://www.eevblog.com/forum/beginners/how-to-analyze-the-opamp-circuit/ OpAmp playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHu2FviAaZaiyXwN41G4b1Lf Podcast: Download

Dave answers an exam question on OpAmps that’s interestingly tricky. Bonus opamp tutorial on biasing. Part 2: https://www.youtube.com/watch?v=33rS0oLULqw https://www.eevblog.com/forum/beginners/how-to-analyze-the-opamp-circuit/ OpAmp playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHu2FviAaZaiyXwN41G4b1Lf 00:00 – A tricky exam question 01:45 – What’s missing? 03:11 – The two most important Opamp rules 04:44 – THINK about what sort of exam you are …

Teardown and reverse engineering of the new Rigol RSA800 series Real Time Spectrum Analyser, from 4.5GHz to 13GHz. 4.5GHz RSA804 8.5GHz RSA808 14GHz RSA814 https://www.rigolna.com/products/spectrum-analyzers/rsa800/ 00:00 – Rigol’s new RSA800 Real Time Spectrum Analyser 06:48 – Teardown 11:42 – RF front end box teardown. Mad Man Muntz 14:55 – Back …

Can you repair a PSU by REMOVING a component? Well, in this case, yeah, kinda. Not recommended for new designs, but it works (for now) because the design margins allowed it. 00:00 – My NerdQaxe++ Bitcoin miner has failed. Guru Meditation! 02:13 – Bitmain 1370 chipset thermal paste 03:54 – …

More Mailbag! 00:00 – Dave & Dylan open random Mailbag 03:49 – DIY bodged laser engraver 04:14 – MPPT Solar charge controller 04:56 – Mixed bags 06:01 – DLP Projector Mirror Arrays 08:05 – TDA2030A Power Amp 08:39 – Analog/Digital combo watch 12:23 – Solar Panels 13:52 – Engineering Spelling …

Teardown and detailed analysis of the Harogic PXN-90 9GHz Spectrum Analyser. https://www.harogic.com/product/harogic-px-series-standard-spectrum-analyzer-receiver/ Forum: https://www.eevblog.com/forum/blog/eevblog-1767-harogic-pxn-90-9ghz-spectrum-analyser-teardown/ Podcast: Download

Youtube have just completely changed what constitutes a “view” ! And they have doubled the limit on monestisation thresholds. https://support.google.com/youtube/thread/433409976

All the EEVblog videos are now available on Spotify thanks to Dylan vibe coding a bulk upload engine with Claude AI. No API? No problem! Plus some interesting EEVblog stats. https://open.spotify.com/show/2LsuS1kDu8jbE3GsOxDQrk One day the Spotify Monetisation might come through.

Dave’s Rode PodMic USB failed, so might as well do a quick teardown before returning it under warranty. Forum: https://www.eevblog.com/forum/blog/rode-podmic-usbs-are-failing!/ Podcast: Download

Using an Waveshare ESP32 RS485 module on the Brink Flair 400 home air ventilation system to email alert if the inlet pressure goes about 400 pascals. And using Claude AI to generate the Arduino code required. 00:00 – Brink Flair 400 ventilation system 02:04 – Waveshare ESP32-S3-RS485-CAN module 06:32 – …

I guess I have 1 million subscribers now. Forum: https://www.eevblog.com/forum/blog/eevblog-1764-can-i-retire-now/ Podcast: Download

Meet Dylan Forum: https://www.eevblog.com/forum/blog/eevblog-1763-meet-dylan/ Podcast: Download

What lurks inside Dave’s decade old Logitech keyboard? Gross-out WARNING! Forum: https://www.eevblog.com/forum/blog/eevblog-1762-logitech-keyboard-vs-food-gross-teardown/ Podcast: Download

Teardown of the new Micsig HMO14 4CH 200MHz 6th generation tablet oscilloscope with built in multimeter. Follow up on the lack of input ptotection! https://www.youtube.com/watch?v=W2o8otvVML4 Forum: https://www.eevblog.com/forum/blog/eevblog-1761-micsig-mho14-tablet-oscilloscope-teardown/ 00:00 – Micsig MHO14 12bit 6th generation oscilloscope 05:00 – Rubber baby buggy bumber 08:13 – The RF shield retaining clips 09:32 – …

An Unusual Repair of a returned new BM786 multimeter Forum: https://www.eevblog.com/forum/repair/an-unusual-bm786-repair/