Posted on April 15th, 2015 23 comments
Mailbag time again.
What have people sent in this week?
AUD$5500 transfer standard 10k resistor in a box from Wekomm!
Holy Xeon ECC server memory Batman!
AC/DC Back To The Future T-Shirt
HeartSine Samaritan Pad Heat Defibrillator
K band radar system
Forrest Mims Radio Shack books
Forrest Mims Amp Hour Interview
Silicon Labs $30 EFM8 8bit 8051 development boards:
Maxim 11300 ADC/DAC evaluation board
Posted on April 10th, 2015 7 comments
What is Sheet Resistance?
Did you know that the resistance of a square copper PCB trace is the same regardless of the size?
Dave explains the theory behind this rather counter-intuitive concept called Sheet Resistance, and demonstrates that it is in fact true.
What is the ohms per square of 1oz copper-clad PCB material and how can you use this concept to calculate the resistance of a PCB trace?
Thin Film Precision Resistor Network video HERE
Posted on April 9th, 2015 17 comments
Youtube are offering a new paid subscription service for viewers who want to watch their videos ad-free.
The catch for Youtube Partners & Content Producers is that it looks as though this is *compulsory* to join and agree to in order to continue to get monetisation on your videos!
Dave goes through the sign-up process on his EEVblog channel.
Article on The Verge HERE
Posted on April 9th, 2015 5 comments
Inside the new Keithley DMM7510 7.5 Digit Bench Multimeter
What gives this unit it’s superb 16ppm/1year accuracy specification?
What construction techniques have they used?
How and why are Fluke so heavily involved?
What considerations are given to the power supply and isolation aspects?
How does it compare with the cheaper Keysight 34770A meter?
The Precision Thin Film Resistor Network video
Posted on April 4th, 2015 7 comments
How ceramic backed precision thin film resistor networks are constructed and laser trimmed.
Examples come from the resistor networks in the 7.5 digit Keithley DMM7510 Multimeter, manufactured by Fluke.