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.
Datasheet for example LED

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:

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

Podcast: Download