Clocks

LED

Search every volume:

?

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.

    Volumes

    1. Vol 1 Overview & Decision Tree What a discrete-logic LED clock is, how it builds digital logic from bare transistors, and which path fits your bench
    2. Vol 2 The LED Display Seven-segment red LEDs, the colon dots, and why every lit segment burns continuously — static drive, one current-limiting resistor at a time
    3. Vol 3 Transistor-Level Building Blocks The handful of circuits the whole clock is made from — the transistor as a switch, diode gates, the bistable latch, the toggle flip-flop, and the comparator
    4. Vol 4 Counters & Frequency Division From a falling-edge toggle flip-flop to the divide chain that turns 60 Hz mains into seconds, minutes, and hours
    5. Vol 5 Decoders & Seven-Segment Drive How two ranks of diode logic turn a counter's four-bit binary count into a lit numeral, statically driven, one segment at a time
    6. Vol 6 The Timebase — Mains 60 Hz How a clock with no crystal keeps excellent time by counting the power line, the low-voltage supply that powers the board, and the clever pulser-and-comparator circuit that extracts a clean 60 Hz and rejects line noise
    7. Vol 7 Build It Yourself A practical bench walkthrough of the KABtronics Transistor Wall Clock kit — the parts, soldering 2,700 joints, the section-at-a-time build order, and the power-up test for each section
    8. Vol 8 Buy a Kit or Finished Clock The KABtronics kit as the realistic buy, why finished discrete-logic clocks are rare and pricey, the visible-logic genre and its cousins, and a skill/time/cost trade-off you can act on
    9. Vol 9 The Collected Project & Troubleshooting A decision-by-decision walk-through of the KABtronics design, its longevity, and the use-your-brain method that gets a 2,700-joint board working
    10. Vol 10 Cheatsheet & Glossary The discrete-logic LED clock on one laminated card — signal chain, count tables, building-block and kit reference, plus an A–Z of every term in the series