Clocks

Numitron

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    Volumes

    1. Vol 1 Overview & Decision Tree What a Numitron clock is, the ways to get one, and which path fits your bench
    2. Vol 2 How a Numitron Works Filament incandescence, the IV-9's anatomy and vacuum, lifetime, and how it differs from a nixie, an LED, and a VFD
    3. Vol 3 Driving Numitrons The electrical model of a filament digit, why it can't be multiplexed, and the CD4511 decoder/latch that sources its current directly
    4. Vol 4 Timebase & Logic The PIC16F876A brain, the two crystals, the interrupt/timer architecture, EEPROM persistence, and the 60-LED ring multiplex
    5. Vol 5 Build It Yourself The Nuts & Volts six-digit IV-9 Numitron clock, start to finish — schematic, BOM, board, SMD assembly, tube installation, power-up, flashing, and calibration
    6. Vol 6 Buy a Kit or Source the Tubes The thin commercial market, where the IV-9 tubes actually come from, and how to buy the parts for the worked build
    7. Vol 7 Enclosure & Finishing The floating acrylic sandwich, edge-polishing, LED alignment, and the steampunk option
    8. Vol 8 The Collected Project A guided tour of Bill van Dijk's six-digit IV-9 Numitron clock — provenance, what's on disk, the two-button UI, the eight LED patterns, and the firmware behind them
    9. Vol 9 Care, Reliability & Low-Voltage Safety Why the clock can't bite you, why the tubes are the fragile part, and how to make a Numitron last its rated decade
    10. Vol 10 Cheatsheet & Glossary The laminate-ready quick-reference card: IV-9 pinout, CD4511 truth table, the worked-clock IC roster, supply math, source URLs, and an A–Z of Numitron terms