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

  • MOSFET Astable: NP-BX1 Rundown

    After eight months from a full charge, an old NP-BX1 lithium battery has come to this:

    Astable green - NP-BX1 - 2.31 V
    Astable green – NP-BX1 – 2.31 V

    The astable still ticks along at 1.4 seconds per blink, but the green LED barely lights up from a 2.1 V battery:

    Astable green - NP-BX1 - 12 mV 100 ohm
    Astable green – NP-BX1 – 12 mV 100 ohm

    A pulse of 12 mV across the 100 Ω resistor puts the LED current at a mere 120 µA: no wonder the poor thing wasn’t visible in ordinary room light.

    Another full charge restored its vigor for another couple of seasons.