Category Archives: Electronics

Pitch to Color

Here is the color wheel used by my electronic instrument, Abella. When the music box is playing “C”, the pitch display appears yellow. Middle “C” is set at 262 Hz, high “C” at 523, and low “C” at 131 Hz, and each is displayed yellow. The remaining notes occupy a RGB-CMY color space.

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Shift registers and Voltage display

I’ve been having great fun with the Arduino Uno microcontroller board.  Here I’ve got the Arduino using a shift register to light up a 7-segment display output.

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Introducing Abella

Sound and light!

abella1

http://www.youtube.com/watch?v=ccJRsY-8vOs

Here is some footage from early hardware development of “Abella,” my Arduino-powered electronic instrument. Yes, it is in a shoebox, and yes, the control knobs are popped through the cardboard. Continue reading

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USB car charger, 2A

The more I’ve learned about switch-mode power supplies, the more amazing it seems to me.  So a voltage source across a wide range of values can be converted into another voltage, just by pulsing current though an inductor.  Of course, switch-mode power supplies are even easier to set up with ICs like this one:

IC REG BUCK BOOST, 296-17764-5-ND

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Cree XM-L Color

This one is truly a beauty.  Here is the new RGBW high-power LED from Cree.

XLAMP XM-L COLOR LED RGBW (XMLCTW-A0-0000-00C3ABB02CT-ND)

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Flea market wafer

I even got to play the rube and ended up paying $20 for a 8″ silicon IC wafer.  I think this one was the most beautiful one the vendor had in stock:

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Photon Battery Device (PBD)

Hey it worked!  Finally put together my new solar-powered ultra-high power LED and it’s sweet!  The solar cell is 1W and the LED runs at 2W, so for every two minutes of sun you get one minute of light!

led_pv_batterylight_on_high Continue reading

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