Amid the chaos of revolutionary France, one man’s mathematical obsession gave way to a calculation that now underpins much of ...

The FFT (Fast Fourier Transform), spectrum analyzer options, and similar frequency domain tools, let you measure a circuit's frequency response with an oscilloscope. You can use several types of input ...

While these scopes do have a Fast Fourier Transform (FFT) function, it’s limited and nearly useless for RF. [Rich] wanted a spectrum analyzer for amateur radio purposes, but didn’t want to ...