Show HN: SPICE simulation → oscilloscope → verification with Claude Code

by _fizz_buzz_ on 4/17/2026, 12:37:47 AM

I built MCP servers for my oscilloscope and SPICE simulator so Claude Code can close the loop between simulation and real hardware.

https://lucasgerads.com/blog/lecroy-mcp-spice-demo/

Comments

by: iterateoften

Beware. I had Claude code with opus building boards and using spice simulations. It completely hallucinated the capabilities of the board and made some pretty crazy claims like I had just stumbled onto the secret hardware billion dollar project that every home needed.None of the boards worked and I had to just do the project in codex. Opus seemed too busy congratulating itself to realize it produced gibberish.

4/17/2026, 3:13:12 AM

by: dharma1

this kind of thing is super cool to close the loop.waiting for FPAA to get better so we can vibecode analog circuits<a href="https://www.eetimes.com/podcasts/making-analog-chip-designs-without-analog-designers/" rel="nofollow">https://www.eetimes.com/podcasts/making-analog-chip-designs-...</a>

4/17/2026, 10:09:57 AM

by: walski

> SPICE (Simulation Program with Integrated Circuit Emphasis) is a general-purpose, open-source analog electronic circuit simulator. [1]1: <a href="https://en.wikipedia.org/wiki/SPICE" rel="nofollow">https://en.wikipedia.org/wiki/SPICE</a>

4/17/2026, 9:03:44 AM

by: Scene_Cast2

I've found that having LLMs work with mermaid diagrams makes describing and modifying circuits less annoying.

4/17/2026, 3:42:16 AM

by: andrewklofas

Hit this exact wall six months back building Claude Code stuff for KiCad review[1]. First pass let Claude read .kicad_sch directly via grep/read. It happily invented pin numbers that didn't exist. Rewrote it with Python analyzers that spit out JSON, now Claude just reads the JSON, problem mostly went away.Curious how spicelib-mcp handles models that aren't in the bundled library. Do you pass the .lib path as a tool arg, or does the server own a registry?[1] <a href="https://github.com/aklofas/kicad-happy" rel="nofollow">https://github.com/aklofas/kicad-happy</a>

4/17/2026, 4:54:08 AM

by: kleene_op

Really nice. My mother is an applied Physics teacher, and she told me they had a hard time at work figuring out how they could connect their teaching material to LLM in a relevant way. This should be useful to her.

4/17/2026, 6:42:40 AM

by: vomayank

Very cool idea closing the loop between simulation and real hardware.Have you found the MCP-driven workflow reliable enough for repeated testing cycles, or does it still need manual verification at key steps?

4/17/2026, 12:44:37 AM

by: Archit3ch

Nice! Doing something similar with a Jumperless so that the model can reconfigure the circuit on the fly.

4/17/2026, 3:06:10 AM

by: hulitu

Measure with a micrometer, mark with a pencil, cut with an axe.

4/17/2026, 5:07:29 AM

by: hexo

Heh, this is like the last thing you need claude for. I mean, you have eyes and brain.

4/17/2026, 8:52:24 AM

by: yashjadhav2102

[dead]

4/17/2026, 10:20:33 AM

by: redoh