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]
Dave tears down Sony’s first digital camera that used removable media, a 3.5″ floppy drive! The 640×480 resolution 0.3Mpixel 1997 vintage Sony Mavica MVC-FD7
EEVblog #625 – Retro Teardown: Sony’s First Digital Camera - [Link]
Dave shows you a handy tip on how to see *through* a product using a Flir thermal imaging camera with the cover *on*. Thus being able to maintain the correct airflow, whilst at the same time being able to view the thermal map as if the cover was off!
EEVblog #622 – How To See Through Objects With A Thermal Camera - [Link]
Dave attended the Cebit 2014 event in Sydney at Homebush Olympic Park. Here are some highlights.
EEVblog #614 – Cebit 2014 Highlights - [Link]
What’s inside a $13K Agilent Source Measure Unit capable of 15fA and 100nV resolution?
EEVblog #607 – Agilent B2912A Source Measure Unit SMU Teardown - [Link]
In this tutorial 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.
EEVblog #600 – OpAmps Explained - [Link]
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.
EEVblog #596 – World’s Cheapest Soldering Station – Yihua 936 - [Link]
What’s inside Tektronix’s new MDO3000 Mixed Domain Oscilloscope? Dave does a teardown and looks at the circuitry and how they can get such a cheap 3GHz RF spectrum analyser to work.
EEVblog #587 – Tektronix MDO3000 Mixed Domain Oscilloscope Teardown - [Link]