EEVblog

David L. Jones
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  • Updated Biweekly

No Script, No Fear, All Opinion

  1. Sep 28 ·  Video

    EEVblog 1774 – PayPal Here Part 2 – Security Boogaloo

    Part 2 of the PayPal Here teardown, because everyone wanted to know what was under the anti-tamper security mesh, so lets take a look. Datasheet: https://www.nxp.com/docs/en/data-sheet/IMX25CEC.pdf 00:00 – We return to the PayPal Here POS terminal teardown 04:11 – They want to stop Skimming hacks, it’s not just the keys 07:39 – Removing the keypad security mesh + a SURPRISE! 11:31 – On-die physical security 12:09 – Removing the card reader security anti-tamper mesh 13:36 – Speculating on hacking this POS terminal Forum: https://www.eevblog.com/forum/blog/eevblog-1773-paypal-here-pos-terminal-teardown/

  2. Sep 28 ·  Video

    EEVblog 1773 – PayPal Here POS Terminal TEARDOWN

    Teardown of the now obsoleted PayPal Here POS Payment terminal. 00:00 – PayPal Here POS payment terminal 03:56 – Teardown 05:10 – Case security clips 06:31 – Battery 08:02 – Security tamper mesh 10:43 – POS Terminal companies and my job at KeyCorp 12:14 – Bye Bye secure keys 14:24 – Battery removal 16:29 – i.MX258 Secure ARM processor Links: https://www.nxp.com/docs/en/data-sheet/IMX25CEC.pdf https://listings.pcisecuritystandards.org/documents/pci_pts_poi_sr.pdf Forum: https://www.eevblog.com/forum/blog/eevblog-1773-paypal-here-pos-terminal-teardown/

  3. Sep 15 ·  Video

    EEVblog 1772 – OpAmp Exam Question 2: Complex Electric Boogaloo

    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

  4. Sep 15 ·  Video

    EEVblog 1771 – A Tricky OpAmp Exam Question

    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 in BEFORE answering the question 07:04 – Capacitive reactance “AC resistance” 08:53 – They want you to use frequency, but also IGNORE it? How does that work? 10:21 – When it doubt, assume a short circuit 10:59 – Solving the first part of the question 12:20 – The 2nd rule of AC circuit analysis 13:33 – Solving the second part of the question, what is the AC gain? 15:29 – There is no need to muck around, move on to the next question 15:58 – Let’s talk about Opamp Biasing 22:59 – Single pole high pass filter 23:31 – Ripple removal filter 26:24 – Conclusion, why is this question is clever?

  5. Sep 8 ·  Video

    EEVblog 1770 – Rigol RSA800 Real Time Spectrum Analyser TEARDOWN + Reverse Engineering

    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 side of the RF block 16:50 – Reverse Engineering with DaveCAD 22:05 – Attenuator & Preamplifier 23:41 – Interesting split into separate HF and LF mixers 25:47 – Preselect filters 27:33 – Flux residue! 28:23 – HF and LF Mixers and 1st stage PLL 30:58 – Downconversion mixing explained 32:48 – 2nd Stage Active IF Mixer, now we are getting serious 36:01 – Final 3rd stage active mixer 36:57 – Dave is WRONG, but why you might want two ADC’s vs one 39:20 – No Dave, it’s a DAC 40:25 – Speculating on the custom ADC used, and digital quadrature sampling 41:49 – Mystery LTC part, and what on earth is going on here with these PCB couplers? 44:32 – Teardown Conclusion 45:51 – Demo comparison of a DSA815 and RSA808, Real Time vs Swept Analysis Forum: https://www.eevblog.com/forum/testgear/new-rigol-rsa800-spectrum-analyser/ Hi-Res Photos: Datasheets: SIS378 Switch: https://www.sicoresemi.com/ueditor/php/upload/file/20250818/1755497980219246.pdf SIAT116 Attenuator: https://www.sicoresemi.com/ueditor/php/upload/file/20260427/1777277733715489.pdf LF Mixer : https://www.sicoresemi.com/ueditor/php/upload/file/20250923/1758612877124723.pdf SIM445 HF Mixer: https://www.sicoresemi.com/ueditor/php/upload/file/20260709/1783577453983448.pdf SIA070 Amplifier: https://www.sicoresemi.com/ueditor/php/upload/file/20260509/1778310579506957.pdf SIS119 Absorptive Switch: https://www.sicoresemi.com/ueditor/php/upload/file/20250324/1742806808125089.pdf SIP052 Phase Converter: https://www.sicoresemi.com/ueditor/php/upload/file/20240627/1719477861130248.pdf SIA332 Amplifier: https://www.sicoresemi.com/ueditor/php/upload/file/20240924/1727159790115927.pdf LMX2820 PLL: https://www.ti.com/lit/ds/symlink/lmx2820.pdf LTC5577 Active Mixer: https://www.analog.com/media/en/technical-documentation/data-sheets/5577f.pdf

  6. Sep 8 ·  Video

    EEVblog 1769 – Who Needs Three Phases? REPAIR

    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 – The flipchip die under the microscope 04:48 – Thermal paste application triggering 06:55 – Time for a new strategy R2. The Vreg temp sensor is now the suspect 07:53 – A look at the open source hardware schematic in KiCAD https://github.com/shufps/qaxe 09:42 – The TPS53647 4 Phase ASIC Buck PSU controller https://www.ti.com/lit/ds/symlink/tps53647.pdf 10:23 – The CSD95472Q5MC Synchronous Buck NexFET Smart Power Stage https://www.ti.com/lit/ds/symlink/csd95472q5mc.pdf 11:50 – We can try wacking a heatsink on + Jaycar field trip 12:41 – Did that fix it? 14:10 – It’s becoming obvious what the fault is now 16:24 – Thermal camera testing 16:56 – Oscilloscope time on the 3 phase PSU 18:21 – Desoldering time, maybe 19:42 – Will removing this component work? 23:52 – AutoBalance multi-phase buck conversion for the win Forum: https://www.eevblog.com/forum/blog/eevblog-1769-repair-by-removing-a-component/

  7. Aug 28 ·  Video

    EEVblog 1768 – Mailbag

    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 + 34401A VFD Replacement https://hubequip.net/products/hp-agilent-34401a-vfd-to-led-display-replacement-led-conversion 17:58 – Treedix USB Cable Tester https://treedix.com/ 24:33 – Zoyi ZT-XC1 Combo LCR & Multimeter https://s.click.aliexpress.com/e/_c4kzCJV5 Forum: https://www.eevblog.com/forum/blog/eevblog-1768-mailbag/

  8. Aug 20 ·  Video

    EEVblog 1767 – Harogic PXN-90 9GHz Spectrum Analyser TEARDOWN

    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/

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About

No Script, No Fear, All Opinion

Information

  • Creator
    David L. Jones
  • Years Active
    2009 - 2026
  • Episodes
    50
  • Rating
    Clean
  • Copyright
    Copyright © David L. Jones 2013
  • Show Website
    EEVblog

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