Category Archives: Electronics

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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LED First Light

Wow, LED’s are amazing!  I just fired up my Cree XM-L2 LED with a 3-cell NiMH battery pack and a 0.91 ohm resistor to keep the current under control.  The circuit runs at 500 mA, which corresponds to 1.4 W for the LED and 0.4 W for the resistor… or 75% circuit efficiency and probably just shy of 200 lumens.  With 2000mAh batteries I should get about 4 hours of light.

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Energy Conversion Project

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