Graphic Artist

Graphic Artist — a digital re-creation of Mitchell Waite's "Oscilloscope Graphic Artist" (Popular Electronics, November 1975), which drove a scope's X/Y inputs with harmonically related signals to draw 3-D-looking wireframes. Four relaxation oscillators A/B/C/D, each square or triangle: A is the fixed master and B/C/D lock to it at integer harmonics — the sync the original circuit was meant to enforce, and which a wiring error on real builds defeated, leaving them drawing an unstable blur. Carrier C is split ±45° and the B envelope modulates each phase; the two perpendicular components are what create the volume illusion on a flat scope, and here that component is lifted onto a real Z so the figure genuinely has depth.

VERT = levelA·A + levelB·(B · C₊₄₅)
HORIZ = levelD·D + levelB·(B · C₋₄₅)

It opens running, on the model selector, with its own knobs. Rotate it by dragging, zoom with the wheel, and turn the parameters to see what the figure does when the system changes.