EE Bookshelf: A Beginner’s Guide to Filter Topologies
Filter design is one of the most interesting aspects of electrical engineering. This is in no small part due to the wide variety of topologies and configurations available for each kind of filter. In the early days, filters were passive — made exclusively of resistors, caps and inductors — but since the advent of low-cost, low-distortion op-amps, active filters have become much more prominent. One of the greatest benefits of active filters is that they don’t require inductors, so size and weight are kept to a minimum.
App note 1762 from Maxim is a good survey of common active filter topos, and explains the strengths and weaknesses of each one. The basic topologies can be extended with more advanced techniques, such as voltage control or switched capacitors, but the underlying configurations are the same.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
Python for Microcontrollers — Python on Microcontrollers Newsletter: CircuitPython tops Tom’s Hardware Best RP2040 Boards 2021 and more #Python #Adafruit #CircuitPython @micropython @ThePSF
