Posted on April 6th, 2014 32 comments
The most often requested video! Dave explains what Operational Amplifiers (OpAmps) are and how they work. The concepts of negative feedback, open loop gain, virtual grounds and opamp action. The comparator, the buffer, the inverting and non-inverting amplifiers, the differential amplifier, and the integrator circuit configurations are also explained.
Then a practical breadboard circuit to demonstrate a virtual ground and the effect of voltage rail limitations.
All EEVblog Opamp related videos are HERE
Posted on April 4th, 2014 38 comments
The EEVblog is 5 years old today!
Just a quick thanks to everyone who has supported me and the blog.
Posted on April 3rd, 2014 4 comments
What’s inside a professional Sony MDE7000 Video Effects Processor, as used in TV stations and video production facilities?
This one was used in the Foxtel TV1 TV station before it was shut down end of 2013.
Dave also discusses high density PCB design issues and methods, and systems engineering.
Spec Sheet: http://www.pmotions.com/Public/PDFs/SONY/DME-7000.pdf
User Manual: http://support.sapir.ac.il/files/2012/05/dme3k7kp.pdf
High Res teardown photos:
Posted on March 31st, 2014 74 comments
Fluke 114/117 Kit Multimeter for hackers, makers, and hobbyists.
Tweet @FlukeCorp if you want to get on the list for one:
Use the hashtag #FlukeKit
Or ask on their Facebook page
Dave comments on the Sparkfun/Fluke multimeter customs trademark/trade dress fiasco, and shows off the new low cost Fluke 114/117 Kit Multimeter about to be released.
The Sparkfun blog post
Flukes Trade Commission Exclusion Order
GIVEAWAY: I’ll be giving this multimeter away to the most needy – but only if you bothered to read this video description!
So if you want it, leave a comment saying why you should have it.
Posted on March 30th, 2014 22 comments
Dave takes a look at the world’s cheapest temperature controlled soldering station, the $16 Hakko 936 knockoff Yihua 936 from Hobby King.
How does it compare to the older genuine Hakko 926?
Also, thermal capacity comparison testing is done on those two irons plus the high thermal capacity JBC.
Sagan also gives his verdict.