Making RAM at Home [video]

Overall reaction to “homemade RAM in a shed”

• Many commenters are amazed by the sophistication of a backyard clean room and RAM fabrication effort, calling it “incredible” and “exactly the sort of thing” they come to see.
• Some stress that this is far from casual DIY: estimate of ~$20k in materials, continuous air circulation, daily cleaning, and deionized water systems.
• Others note that the creator is a highly skilled semiconductor engineer; this is not something “regular people” can realistically reproduce to a reliable production standard.

Clean room, tools, and process

• People are impressed by the modified microscope acting as a photolithography tool and the homemade plasma etcher; the furnace itself is noted as an off‑the‑shelf Chinese unit.
• Positive-pressure backyard clean room is described as almost “mystical” to achieve.
• Some compare the feat favorably to early semiconductor fabs, noting how far individual tinkerers can now go.

How DRAM actually works

• Multiple replies explain DRAM operation for confused readers:
  • Tiny capacitors store charge that leaks quickly and must be refreshed.
  • Reading intentionally disturbs the charge and uses sense amplifiers to detect a tiny voltage change, then restore it.
  • The demo chip only has a small array of cells and no full sense/refresh circuitry yet.

Safety and chemistry concerns

• Strong warnings about dangerous chemicals, especially phosphine and hydrofluoric acid, which are common in real fabs and can be lethal even when “empty” tanks are handled.
• Several argue this is a major reason home semiconductor work shouldn’t be widely replicated, contrasting it with much safer electronics tinkering (e.g., 7400 logic, PCBs, 3D printing).

Economics, shortages, and “artisanal RAM”

• Discussion of RAM price spikes driven by AI demand; some in infrastructure/healthcare say they’re already seeing large cost increases.
• Skeptics argue small-scale fabs can’t compete: yields would be poor, per‑unit cost far above industrial RAM, and the market is highly commoditized.
• Jokes and semi-serious ideas about “homegrown” or “small-batch” RAM as a niche, but consensus is that scaling this into a viable business is unrealistic.

Meta: relevance, video format, and future tech

• Some worry videos don’t do well on Hacker News; others say this kind of deep technical tinkering is precisely on-topic.
• Side discussions touch on core memory, neuromorphic computing, open hardware fab projects (like HackerFab), and whether advanced (e.g., 7 nm) home processes might ever be possible—most treating that as far-future or unrealistic.
• A few frame home fabrication as important for long-term “computing freedom,” especially if large corporations and states dominate chip production.