In this tutorial Dave describes what AC trigger coupling is on an oscilloscope and why it can be useful. Not only on old analog CRT oscilloscopes, but modern digital scopes as well.
How and why is it different to AC channel input coupling?
Also, use of the 50% trigger control, and how the venerable DS1052E is still more usable than the new DS1054Z.
EEVblog #685 – What Is Oscilloscope AC Trigger Coupling? - [Link]
In this tutorial Dave explains what a PCB spark gap is and how it can be a useful zero cost addition to your PCB layout to help prevent ESD damage.
He shows how to easily design them into your board and calculate the approximate voltage rating.
And of course has some fun applying 5kV to some gaps to show how them at work.
EEVblog #678 – What is a PCB Spark Gap? - [Link]
by EEVblog @ yoututbe:
What’s inside the new FLIR TG165 Visual IR Thermometer / Thermal Camera using the new Lepton sensor?
How does it compare to the FLIR ONE & FLIR E4?
Does it have a calibration shutter?
Does it have any extra capability built in ready to be hacked?
How easy is it to open? (SPOILER – it’s a BASTARD!)
EEVblog #669 – FLIR TG165 Thermal Imager Teardown - [Link]
A very brief look at the new WENS 540 Debug Meter with Charles from Trio Test at the Electronex show stand:
This is NOT a review, or my normal blog content, it’s just a quick look because some people may be interested in it. So please, no silly complaints.
A combination 10MHz oscilloscope, 50000 count meter, 8 channel logic analyser, data logger, serial protocol analyser, and digital pattern generator.
WENS 540 Handheld 10MHz Oscilloscope and Debug Meter - [Link]
Dave walks around the Electronex 2014 electronics exhibition at the Australian Technology Park, after hours when no one is there, and takes a peek at every stand.
Electronex 2014 – Walkaround - [Link]
What’s inside a dial-in pacemaker monitor system?
EEVblog #656 – Pacemaker Monitor Teardown - [Link]
Dave explains a big trap in high frequency measurement with your oscilloscope. Based on a viewer request, Dave demonstrates how to incorrectly and then correctly measure the signal output level over frequency of your function generator using your oscilloscope. Some whiteboard transmission line theory is thrown in as well.
EEVblog #652 – Oscilloscope & Function Generator Measurement Trap - [Link]
What’s inside one of those omni-directional laser barcode scanners you use at the supermarket, and how does it work? Motorola / Symbol LS9208
EEVblog #637 – Omni Directional Laser Barcode Scanner Teardown - [Link]
Dave grabs a few junkbox parts and builds a useful constant current load for switch mode power supply, battery testing, and other applications.
EEVblog #102 – DIY Constant Current Dummy Load for Power Supply and Battery Testing - [Link]
Dave explains, shows, and measures a potentially big trap with using high value ceramic capacitors. Is your 10uF capacitor really 10uF in your circuit? You might be shocked! Those humble X7R caps you think are a “stable” dielectric? think again… Class II and above ceramic capacitors can vary their capacitance drastically with DC bias voltage level and also the applied AC voltage.
EEVblog #626 – Ceramic Capacitor Voltage Dependency - [Link]