Dave explains, shows, and measures a potentially big trap with using high value ceramic capacitors.
Is your 10uF capacitor really 10uF in your circuit? You might be shocked!
Those humble X7R caps you think are a "stable" dielectric? think again...
Class II and above ceramic capacitors can vary their capacitance drastically with DC bias voltage level and also the applied AC voltage.
Links:
http://www.murataamericas.com/murata/murata.nsf/promo_dcbias.pdf
http://www.avx.com/docs/masterpubs/mccc.pdf
http://www.ece.ucdavis.edu/vcl/asap/asap_v1/docs/X7R_C.pdf
http://psearch.murata.com/capacitor/product/GRM21BR60J106KE19%23.html
http://www.murata.com/products/design_support/simsurfing/outline.html
http://www.avx.com/SpiApps
Capacitor Tutorial - Ceramics & Impedance
https://www.youtube.com/watch?v=TDDoi70cxw0
The piezoelectric effect demonstrated:
https://www.youtube.com/watch?v=KFCRB4d991E
Forum: http://www.eevblog.com/forum/blog/eevblog-626-ceramic-capacitor-voltage-dependency-download/
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How secure are electronic locks used on safes?
Dave tries a basic first attempt power line analysis attack on a standard La Gard (LG) 3740/3750 Basic electronic digital lock on a CMI home safe.
Can you crack an electronic digital safe lock with just a resistor and an oscilloscope?
All sorts of safe cracking techniques are discussed - thermal camera imaging, bumping, drilling, and spiking the solenoid.
And naturally there is a complete teardown of the La Gard lock and a demonstration on how it works.
And then Dave does something incredibly dumb, and has to fix it the old fashioned way, Hollywood style.
It's a tail of epic fails and stunning wins.
Part 2 is here: https://www.youtube.com/watch?v=mdnHHNeesPE
Forum: http://www.eevblog.com/forum/blog/eevblog-762-how-secure-are-electronic-safe-locks/
http://www.kaba-mas.com/media/654586/v4/File/basic-basic-plus-series-brochure.pdf
ST ST62T25 OTP Microcontroller
http://www.alldatasheet.com/datasheet-pdf/pdf/23746/STMICROELECTRONICS/ST62T25.html
AT93C46 http://www.atmel.com/Images/doc5140.pdf
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PART 1: http://youtu.be/kXWRLNq8OCU
PART 2: http://youtu.be/oyryds71p44
PART 3: http://youtu.be/52tafTy2q_Q
PART 4: http://youtu.be/o0bkyAntDHo
www.talkingelectronics.com
Part 1 of an interview with Colin Mitchell, the pioneering founder of Talking Electronics magazine, which was immensely popular in the 1980's in Australia.
A behind the scenes walk-through of the Sydney Powerhouse Museum before the start of the Sydney 2015 Mini Maker Faire
Forum: http://www.eevblog.com/forum/blog/eevblog-784-sydney-maker-faire-2015/
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Dave scored a cheap non-working Stanford Research SR650 8 pole programmable elliptical filter on ebay. Can it be fixed?
Well, yes, but it looks like there will be a part 2...
http://www.thinksrs.com/products/SR600.htm
Mains Filter datasheet: http://www.jameco.com/Jameco/Products/ProdDS/1174803.pdf
Partial schematic: http://www.ens-lyon.fr/DSM/AGREG-Physique/oral/Notices/N041-023.pdf
Forum: http://www.eevblog.com/forum/blog/eevblog-620-repair-stanford-research-sr650-programmable-filter/
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Dave reviews the new Rigol DS1054Z Oscilloscope.
Is this US$399 marvel really the best value budget oscilloscope on the market?
This is a summary video, be sure to watch all the other videos on this scope:
Full features review: http://youtu.be/W2qdtQkBKhc
Teardown: http://youtu.be/kb9P1Am9aFU
Jitter Problem: http://youtu.be/kcOdzFaIYNE
Jitter Problem Fix: http://youtu.be/K1IJH9aJvgE
Reverse Engineering: http://youtu.be/lJVrTV_BeGg
Forum: http://www.eevblog.com/forum/blog/eevblog-703-rigol-ds1054z-oscilloscope-review-summary/
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Fundamentals Friday
What is a Schmitt trigger and how does it work?
What is hysteresis?
And how do they fix two common problems in electronics, namely slow slew rate signals on CMOS digital chip inputs causing oscillation, and noise on comparator inputs.
The issues are demonstrated first on the breadboard, then the whiteboard explanation, and then the hysteresis fix is added and demonstrated.
And how are Schmitt Triggers physically implemented in CMOS logic?
Forum: http://www.eevblog.com/forum/blog/eevblog-941-the-amazing-schmitt-trigger/
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