EEVblog #735 - Mailbag

Another movie length Mailbag.
What have people sent in this week?
Forum: http://www.eevblog.com/forum/blog/eevblog-735-mailbag/

SPOILERS:
Why are cheap Ebay LED light bulbs so bad? Dave investigates why some of them are doomed to fail. DaveCAD and thermal camera time.
http://www.qt-brightek.com/datasheet/QBLP679E-IWK-XX.pdf

CPM700 Countersurveillance unit from Research Electronics Inc for cold war spy bug sweeping.

Cheap Ebay voltage sources for multimeter calibration

Raspberry Pi I/O Hat Kickstarter, the Hatilogico:
https://www.kickstarter.com/projects/jelby/hatalogico-for-the-raspberry-pi

Industrial RS232 modem teardown

Bricked Assus TF300 Transformer Tablet

Annoy-a-tron

Belkin router teardown

Cypress Parachute Automatic Activation Device.
Previous video teardown on this: https://www.youtube.com/watch?v=9-wzPTiLz5c


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