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“In this Instructables I am going to show you how to create a spectrum analyzer powered by an Arduino nano. A spectrum analyzer basically analyzes the intensity of different frequencies in a song. To display those values we are going …

“Code for a spectrum analyzer. The code is to be ported to an ATTiny85 to make a project. Uses Goertzel’s algorithm with a Hamming window.”

“Ham radio is the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, etc. Developing a ham radio project may requires using an antenna analyser, a device that is used for measuring input frequency …

“This is another of those crazy ideas that have been rolling around in my head for a while now. I have previously used super-regenerative circuits as logarithmic detectors, and built super-regenerative super-heterodyne receivers - it wasn’t a huge leap to …