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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.
Posted in Electronics, Solar
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Introducing Abella
Sound and light!
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
Posted in Electronics, Music
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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
Posted in Electronics
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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)
Posted in Electronics
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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:
Posted in Electronics
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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!
Posted in Electronics, Solar
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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.
Posted in Electronics
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