Dave at EEVBlog 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.
As you might have noticed, the theme changed from white on black to a much more readable black on white. So far I’m just using the default options in the WordPress 2011 theme, but I’m looking for a fresher look.
I’m currently rounding up the bugs, importing the old tickets from SourceForge, Twitter feed and e-mail sources, so that I can track them more efficiently, since the tracker on GitHub is really powerful and well integrated with Git.
In the next days/weeks I’ll be working on addressing most of these issues for the v4.2 release. Then v4.3 will be on its way with some changes on the settings system, which will allow for the same flexibility without the need to modify anything in the library files.
The Logic Pirate is an inexpensive yet capable open source logic analyzer. For just 30 bucks it can sample 8 channels, 256K samples per channel, at a blazing (overclocked!) 60 MILLION samples per second! It’s designed to support the SUMP logic analyzer protocol on Jawi’s open source software that works on most platforms.
Its big brother the Logic Sniffer is great, but this little one looks more appropriate for simpler sniffing of all digital things, and more portable (always appreciated for hackers on the move).
Dave at EEVBlog receives Doug Ford, former head designer at Rode Microphones, who explains the basics of how microphones work, the different types – carbon, dynamic, ribbon, condensor/electret, and how the omnidirectional pattern works.