EEVblog #61 – Crystal Oscillator Drift

Dave explains the what how and why of measuring crystal clock oscillator drift over time.

The Clock Drift PCBs

Real data collected with the sine fit envelope.
And results showing the same characteristic result over a slow temperature ramp.

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EEVblog #50 – Solid State LED Lighting, and How Thermal Design Sucks

Dave lights up his new backyard deck with Cree XPG LEDs, and then winds up measuring the wind from a storm instead. And who can spell efficacy?

LINKS:
Cree XPG LED Datasheet
Arctic Silver Thermal Adhesive
Luminous Efficacy Graph
Graph #1
Graph #2
LED Strip, Mounted LED
700mA 35W Mains LED driver

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EEVblog #49 – Decibels (dB’s) for Engineers – A Tutorial

Are you a pessimist or an optimist? Dave explains dB’s and how they are useful for us engineering types.

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