In this episode Shahriar continues his investigation of discrete Bipolar amplifier design. The advantages and disadvantages of Class-A amplifiers are explained. The conceptual schematic of a Class-B amplifier is presented which leads to the introduction of Class-AB amplifier circuit to overcome the ‘dead-zone’ impairment of a push-pull Class-B design. To further improve the Class-AB amplifier and lower its input impedance, a final Class-A followed by Class-AB amplifier is presented The component parameters are calculated and the schematics is explained in detail. All circuits are then implemented on a breadboard and tested both in the time domain and frequency domain. All schematics can be downloaded from The Signal Path website.
Tutorial on the Design and Characterization of Class-B and AB Amplifiers - [Link]
“stevechamberlin” hands-on review of the Rigol DS1074Z oscilloscope
Rigol DS1074Z Oscilloscope Review - [Link]
This video shows the detail process of making of a chip at Philips Factory.
Chip Manufacturing Process – Philips Factory - [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]
Dave assembles his first uCurrent in the SMD reflow oven. With random running commentary while pick and place assembling.
EEVblog #562 – More SMD Oven Reflow - [Link]
Here is a nice series of 3 video tutorials, covering basic functionality of Cadsoft Eagle from Schematic Capture to CAM Export and PCB manufacturing. The 3 parts are:
- Tutorial 1 for CadSoft Eagle: Schematic Design
- Tutorial 2 for CadSoft Eagle: Printed Circuit Board Layout
- Tutorial 3 for CadSoft Eagle: CAM Output and DFM
Check them out!
CadSoft Eagle Tutorials by jeremyblum.com - [Link]