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  • EEVblog #678 – What is a PCB Spark Gap?

    Posted on October 31st, 2014 EEVblog 2 comments


    In this tutorial Dave explains what a PCB spark gap is and how it can be a useful zero cost addition to your PCB layout to help prevent ESD damage.
    He shows how to easily design them into your board and calculate the approximate voltage rating.
    And of course has some fun applying 5kV to some gaps to show how them at work.
    Plugpack teardown

    Support the EEVblog through Patreon!

    Forum HERE

  • EEVblog #677 – Mailbag

    Posted on October 28th, 2014 EEVblog 3 comments


    Mailbag Monday
    Dave opens his mail.

    Spoilers & Links:
    HP 4260A LCR Universal Bridge
    User & Service Manual
    iPod Blood pressure monitor
    Old computer hardware
    Intel 1Mb Bubble Memory
    PICop development board
    TEM Products SMD IC and LED thermal products
    PowerPeg
    Stepper Motor Controller
    TSL1401CL LineScan Camera

    Forum HERE

  • EEVblog #676 – RANT: FTDI Bricking Counterfeit Chips!

    Posted on October 27th, 2014 EEVblog 34 comments


    FTDI have released a windows driver update that bricks any product using counterfeit chips.
    A classic case of corporate suicide.
    Dave breaks down “FTDIgate”, and rants about FTDI’s official response.

    NOTE: The 2nd half of this video includes the original rant video before FTDI responded and withdrew their new driver.

    FTDI’s response

    The forum thread that’s going crazy!

  • EEVblog #675 – How To Reverse Engineer A Rigol DS1054Z

    Posted on October 22nd, 2014 EEVblog 16 comments


    Dave shows you how to reverse engineering a PCB to get the schematic. In this case the new Rigol DS1054Z oscilloscope.
    How does the discrete transistor analog front end and the software bandwidth limiting work?
    How do you decode SMD transistor codes?
    How does it compare to the old Rigol DS1052E?
    Dave also discusses the low voltage ohms function of a mulitmeter, how it’s useful, and how to test your multimeter to see if it will have any issues with in-circuit testing.

    Schematic:
    DS1054Z Front End
    DS1054Z Diff Amp
    DS1052E Schematic

    Links:
    SMD codes
    From Digikey

    Datasheets:
    MMBFJ309L JFET
    BAV199 Diode
    BC856
    Fujitsu FTR-B3 Relay
    Cosmo solid state relay
    TL072: http://diodes.com/datasheets/TL072.pdf
    74HC4053
    TLV274 Precision Quad Opamp
    AD5207 Digital POT

    Forum HERE

    Teardown Photos:

  • EEVblog #674 – Rigol DS1054Z Teardown

    Posted on October 15th, 2014 EEVblog 9 comments


    Dave tears down the new US$399 Rigol 4 channel 50MHz DS1054Z oscilloscope.
    How can they get such incredible value for the price?

    Datasheets:
    Hittite HMCAD1511 ADC
    ProASIC 3 FPGA
    SRAM
    Freescale iMX283 Applications Processor

    Forum HERE

    High Res Teardown Photos: