Hosted by David L. Jones
And presented in Dave's unique non-scripted overly enthusiastic style!
-
EEVblog #215 – Gaussian Resistors
Posted on November 8th, 2011 23 comments
Just how far out is that +/-1% metal film resistor you are using?
Is it just random?
Does it follow the classic bell shaped Gaussian response?
What are the odds of getting one that’s spot on, or right out at the limits?
Dave thought he’d find out, the hard way…Original Data can be found here, in both Open Office and Excel formats, play around yourself!
http://www.eevblog.com/forum/index.php?action=dlattach;topic=5460.0;attach=16808See here for more analysis on the data by Bob from Ohio:
http://www.eevblog.com/forum/index.php?topic=5460.msg71085#msg71085 -
EEVblog #141 – AA Alkaline Battery Capacity Measurement
Posted on January 27th, 2011 25 commentsHow much Wh capacity does a typical Alkaline AA battery have? Dave intends to find out with his new Gossen Metrawatt Metrahit Energy multimeter
-
EEVblog #140 – Battery Capacity Tutorial
Posted on January 23rd, 2011 23 commentsEver wanted to know what battery capacity is? Dave takes you through everything you need to know about amp-hours, mAh, watt hours, internal or series resistance, temperature effects, battery cutoff voltages, and characteristic curves.
Part 2 coming soon. -
EEVblog #133 – Dodgy Digikey Components
Posted on December 14th, 2010 69 commentsDave cuts loose on Digikey (or Bourns?) for providing dodgy resistors which made their way into his
-
EEVblog #105 – Electronics Thermal Heatsink Design Tutorial
Posted on August 15th, 2010 20 commentsA follow on from some of the recent blogs that have involved basic thermal heatsink calculation. This time around Dave takes you though the basic theory of thermal design and how heatsink calculations work. Then there are some real world temperature measurements to see how close to the theory we get.
How do you read a heatsink thermal response graph? What is emissivity? It’s all here in thermal design 101.
