S.U.N. Church — Knowledge Commons

The Library.

Non-linear reference material: concepts, schematics, datasheets, historical documents, original writings, and public domain texts. Independently accessible — no course required.

Access note: Original content and public domain material is free. Licensed third-party works are marked separately and may require access credentials.
FEATURED REFERENCE
Concept article — Electronics / Radio
The spiral curriculum: how modulation recurs across phases

A cross-referenced map of how CV, AM, FM, pulse, and digital modulation share a common ancestor — and how each phase of the college revisits the concept at increasing depth. Includes worked diagrams of each modulation type with time-domain and frequency-domain representations.

Free modulation signals AM FM SDR
ELECTRONICS — CONCEPTS & SCHEMATICS
showing 12 of 157
DATASHEETS — RECENT ADDITIONS
140+ entries
CALL NO. TITLE / PART TYPE ACCESS
HISTORICAL DOCUMENTS
Public domain
US Patent No. 174,465 — A. G. Bell, 1876
Original telephone patent filing. Drawings, description, and claims.
Public domaintelephoneBell
Public domain
Morse's letter to Alfred Vail, 1838
Description of the original dot-dash telegraph code. Primary source.
Public domainMorsetelegraph
Public domain
Maxwell's Treatise on Electricity & Magnetism (1873)
Foundational mathematical framework for electromagnetic theory.
Public domainEM theoryMaxwell
Public domain
ITU Radio Regulations — Baudot Code Tables
Original Baudot 5-bit code assignment tables from ITU archives.
Public domainBaudotteletype
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