The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

The New Hotness

  • Avalanche Noise Amp: Hardware

    Finally, the as-built hardware for the Avalanche Noise Random Number Display gadget:

    Reverse-bias noise amplifier - detail
    Reverse-bias noise amplifier – detail

    The noise interconnection consists of one little wire:

    High Speed Randoms - Schematic - overview
    High Speed Randoms – Schematic – overview

    The noise generator, amplifier, and bias power supply:

    High Speed Randoms - Schematic - avalanche noise amplifier
    High Speed Randoms – Schematic – avalanche noise amplifier

    The Arduino (Pro Mini, at least) and the logic / LED power supply:

    High Speed Randoms - Schematic - Arduino and power
    High Speed Randoms – Schematic – Arduino and power

    The row drivers:

    High Speed Randoms - Schematic - row drivers
    High Speed Randoms – Schematic – row drivers

    And the red-green-blue LED column drivers:

    High Speed Randoms - Schematic - column drivers
    High Speed Randoms – Schematic – column drivers

    All of which make the common-anode RGB LED matrix blink merrily away:

    High Speed Randoms - Schematic - 8x8 RGB LED Matrix
    High Speed Randoms – Schematic – 8×8 RGB LED Matrix

    Now all it needs is a dollop of source code…