It’s not the most complicated thing, but I’m liking this for a basic one in supercollider:
Dust2.ar(2.5, 1) + Crackle.ar(1.95, 0.1) + SinOsc.ar((PinkNoise.ar(0.5) * 7500) + 40, 0, 0.006);
Crackle is a chaos noise that sounds like… crackle. Dust2 isn’t particularly different from “velvet noise” (random positive or negative impulses N times per second), and the last bit is the “bacon fry” technique mlogger mentioned. Pass it through some HPFs/LPFs (mine’s going through MoogFF.ar(HPF.ar(LPF.ar(noise, 5000), 260), 3100, 0); for a lo-fi kinda vibe) if you’d like