A Fubsy Polymath subdomain
Analog Computers
Solving differential equations with op-amps, patch cords & voltage.
Multi-volume deep dives into the machines that compute with continuous voltage instead of bits — 6 fully documented so far.
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How to search
sten gun- pages with both words
"sten gun"- the words together, as a phrase
sten OR sterling- either one (
|works too) sten -replica- leave out pages that mention “replica”
Without quotes, the last word also matches longer words that start with it (sten finds Stenophylla), and close word forms count (rifle finds rifles). Tick Exact words to match whole words only.
Whole deep dives are listed first, then the pages inside them.
Machine deep dives
Live THAT — The Analog Thing A modern open-source desktop analog computer — patch op-amps to solve differential equations in real time. Live
Live Heathkit EC-1 Heath's 1959 educational analog computer — nine op-amps of tube-era equation solving. Now on the Heathkit site. Live
Live Heathkit ES-400 Heath's 1956 electronic analog computer (H-1), built for industrial and educational laboratories. Now on the Heathkit site. Live
Live Aeon Dynamic Simulator A late-1980s British teaching machine with no traceable maker — and each element’s circuit silkscreened onto the patch field, so the panel is the manual. Live
Live EAI PACE TR-10 EAI's solid-state desktop machine — twenty plug-in computing modules patched on their own front faces, reconstructed from a documentary record thin enough that the series says where it runs out. Live
Live GE Project EF-140 General Electric's 1961 educational kit — three potentiometers and an earphone null, sold as an analog computer with no amplifier or integrator anywhere in it. Live
Live Vogel Homebrew A 2009 demonstration machine with a complete schematic but nothing a manufacturer would have made — and a valve sibling whose amplifier is lifted from the Heathkit EC-1. Live
Live Homebrew / Open-Source Ten buildable designs measured against a four-question licence test — of which exactly one turns out to be unambiguously open hardware. Live
More machines coming
Historical Library
378 books — operator manuals, textbooks, schematics & catalogs across ~92 makers. 141 with English translations.
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