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]
Dave shows how the assemblers will production test the µCurrent PCB panels using his new test jigs. And he will does a trial run on 50 µCurrent PCB’s to determine the average testing time. What will take the longest – PCB testing, or wrapping, or packaging?
EEVblog #588 – How To Do PCB Production Testing - [Link]
Dave reviews the Canadian Advance Devices Smart Tweezers LCD meter. What will he find? Does it cut the mustard?
Bonus LCR meter tutorial at the end.
EEVblog #81 – Smart Tweezers LCR Meter Review And Teardown - [Link]
Dave breadboards a precision 1A current source circuit and finds that even the application reference circuit doesn’t work as expected. Showing that you can’t just blindly trust that datasheet application circuit will work first go.
EEVblog #567 – Precision 1A Current Source - [Link]
What is the actual capacitance of typical breadboard contacts?
It’s not in the datasheet, so Dave decides to measure it. It is well know that breadboards are not suitable for high frequency work due to the stray capacitance between contacts, but how bad is it really?
EEVblog #568 – Solderless Breadboard Capacitance - [Link]
Dave takes a look at two cheap USB microscopes to see how suitable they are for electronics works and soldering and inspection.
EEVblog #566 – Cheap USB Microscope Reviews - [Link]
Ever wondered how they transmit your TV signal?
David Kilpatrick from TXAustralia takes us on a detailed tour of the old decommissioned 10kW analog TV transmission system at the Artarmon facility in Sydney. It is still used to transmit digital TV. How it all works from the broadcaster video input to final transmission output up the 180m broadcast antenna. Plus some teardowns of the old equipment that’s been used to transmit the Channel 7 TV signal in Sydney since 1981.
Copper rigid coaxial lines, waveguides, filters, splitters, combiners, converters, transmission valve, power supplies and all the equipment necessary to transmit a 10kW analog or digital TV signal in a major city like Sydney.
EEVblog #569 – Tour of an Analog TV Transmission Facility - [Link]