Academy Flowgraph RF / DSP block-graph MVP

A movable-block, draggable-wire flow graph that runs real audio in your browser via Web Audio. The GNU-Radio-Companion gesture (drag block, connect, run) without the GR runtime. Pedagogical reimplementation per spec-research memo 2026-05-29.

How to use this

Click Demo flow in the toolbar to drop a working chain (Signal Source → Throttle → Filter → FFT Spectrum with a parallel feed to Audio Sink). Press Run. You will hear the filtered sine wave and see the FFT spectrum render in real time. Edit the source frequency, filter cutoff, and waveform shape live while the graph runs and watch the spectrum follow.

To build your own: click any + block button in the toolbar to add it, drag the header to position, drag from a green output dot to an input dot to wire. Double-click a wire to remove it. Press the × on a block header to delete the block.

v1 block roster (8): Signal Source, Throttle, Filter, FFT Spectrum, Waveform, Constellation, Audio Sink, File Source, File Sink. Per curriculum-research/nocode-flowgraph-tools-2026-05-29.md §4.