A full-width oscilloscope hero: a summed three-harmonic waveform drawn as one continuous box-drawing trace inside a box-drawing frame with a live amplitude/frequency readout, where the pointer injects energy into a real damped wave simulation that rings outward from the touched column and settles back over about a second.
pnpm dlx shadcn@latest add "https://design.helpmarq.com/r/hero-oscilloscope.json"