Doug Ford, former head designer at Rode Microphones explains 48V phantom powering of microphones and how it works.
There is a ton of stuff here:
Electrostatic and electromagnetic noise, differential amplifiers, common mode noise, transformer magnetisation current, JFET differential driver circuits, balanced impedances, phase splitters, miller capacitance and how it matters, and he explains how the Schoeps amplifier topology works.
Forum here: http://www.eevblog.com/forum/blog/eevblog-616-how-microphone-phantom-powering-works/
All the videos in this series with Doug: http://www.youtube.com/playlist?list=PLvOlSehNtuHv98KUcud260yJBRQngBKiw
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Dave opens his mail. A potpourri of items this week.
Forum: http://www.eevblog.com/forum/blog/eevblog-775-mailbag/
SPOILERS:
The world's smallest digital dosimeter / Geiger counter, and it's open source!
https://github.com/shodanx/ultramicron
https://www.youtube.com/watch?v=PKjtOTeAevg
The Stick-Vise PCB Holder:
http://www.stickvise.com/
Russian nixie tube display
The 1962 Ferrari 250 GTO
Telsa merch
Buzz Aldrin's Mission To Mars
Old Hioki analog clamp meter teardown
Old analog VOM teardown
Citizen Pocket LCD TV
Texas Instruments SR-10 Electronic Slide Rule Teardown
JRC ADC chip datasheet: http://pdf1.alldatasheet.com/datasheet-pdf/view/7614/NJRC/NJU9203BD.html
Old PSU teardown
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What's inside a professional digital audio mixer?
Dave opens a Yamaha DME32 Digital Mixing Engine with multi-channel 24bit audio ADC and DAC and custom DSP processing.
Sony video effects unit teardown: https://www.youtube.com/watch?v=d9lZ2-a1P-E
Forum: http://www.eevblog.com/forum/blog/eevblog-738-yamaha-dme32-digital-mixer-teardown/
User Manual: http://www2.yamaha.co.jp/manual/pdf/pa/english/signal/DME32E.pdf
Datasheets:
http://www.cirrus.com/en/pubs/proDatasheet/WM8740_v4.4.pdf
http://www.analog.com/media/en/technical-documentation/data-sheets/OP275.pdf
http://www.njr.com/semicon/PDF/NJM4580_E.pdf
http://www.njr.com/semicon/PDF/NJM2115_E.pdf
http://www.xilinx.com/support/documentation/data_sheets/ds065.pdf
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Dave tests the AD8436 True RMS converter chips inside the 121GW multimeter to see if it works well below it's voltage rail specification.
Bonus thermal testing in the chamber.
http://www.analog.com/media/en/technical-documentation/data-sheets/AD8436.pdf
Forum: http://www.eevblog.com/forum/blog/eevblog-972-operating-chips-outside-their-spec/
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The Renesas YRPBRL78G13 Demo board:
http://am.renesas.com/products/tools/introductory_evaluation_tools/renesas_demo_kits/yrpbrl78g13/index.jsp
The Chronoview USB Logic Analyser:
http://www.chronovu.com/
An impromptu teardown on the Emona stand at the Electronex trade show, of the Picoscope 5000 flexible resolution USB oscilloscope, with a small crowd of EEVblog viewers watching on.
Also uses the Tagarno HD ZIP 40x digital magnifier.
http://www.tagarno.dk/en/frontpage/products/inspection/home/product-pages/products/digital-magnification-systems/magnus-hd-zip.aspx
https://secure1.bluecentral.com/emona/shop/scripts/prodList.asp?idCategory=84
http://www.picotech.com/document/datasheets/PicoScope5000Series.pdf
http://www.mouser.com/catalog/specsheets/DataSheetASD5020HS_v2.0.pdf
http://www.hittite.com/content/documents/data_sheet/hmc-ad1520.pdf
http://www.bizjournals.com/boston/blog/mass-high-tech/2011/01/hittite-microwave-buys-arctic-silicon-devices.html
Forum: http://www.eevblog.com/forum/blog/eevblog-521-picoscope-5000-usb-oscilloscope-teardown/
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