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Archive for January 17th, 2019

Astable Multivibrator: Monochrome Pirhana LED

The LED parts box disgorged some single-color Pirhana-style LEDs:

Astable - 2N7000 - Mono Pirhana LED
Astable – 2N7000 – Mono Pirhana LED

Didn’t quite catch the blink, but the Ping-Pong ball radome lights up just as you’d expect.

The radome sits on a stripped-down RGB LED spider:

Astable Multivibrator Battery Holder - mono LED Spider - fit view
Astable Multivibrator Battery Holder – mono LED Spider – fit view

The circuitry is the same as the First Light version, with a 1 MΩ resistor stabilizing the LED ballast resistor:

Astable - 2N7000 - Mono Pirhana LED - detail
Astable – 2N7000 – Mono Pirhana LED – detail

Those are 1 µF ceramic caps in the astable section, so I’m no longer abusing electrolytics, and a stylin’ 100 nF film cap metering out the LED pulse up above.

Just for pretty, I’ve been using yellow / black wires for the battery connections and matching the LED color with its cathode lead.

The OpenSCAD source code as a GitHub Gist:

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