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Audio, Bread Board, Electronics, Electronics Circuits, LM358, Laboratory, Made, Near Future Laboratory, Observations, Op-Amp, Oscilloscope
...or The Electronic Tree.
A tiny ribbon cable from a replacement screen for my son's Nintendo DS that I will be spending most of the rest of my life trying to fit.
This little microcontroller evaluation kit is going to be a long exposure timer/intervalometer when I'm done with it. For about $20, it comes with an 8-bit processor with 16K of flash memory, LCD screen, a serial port for programming (you have to solder your own header to it), a temperature sensor, and other assorted goodies (including 512KB of external flash that I have no use for).
Here's the circuit for the Black Box Lightshow. I'm pretty sure it's right. And now, an explanation:
The LED array is shown here as individual diodes, though I used six 5x7 LED arrays, each one is 2" tall. They are arranged as 14 rows and 15 columns. The left channel is 8 columns and the right channel is 7 columns. The extra column from the left channel is the center column and gives nice symmetry. Not shown here is that on the right channel, the first column (pin 1) is not used so that the other columns are equal.
The LM3914 is a Dot/Bar Display Driver. It does all the heavy lifting of converting the audio signal into a series of bars - these are typically used as digital meters. The potentiometer sets the sensitivity of the display. Since the rows are multiplexed (see below), each column is only driving one LED at a time. I only show the left channel here, the right channel is identical, and they share the level setting potentiometer.
The right portion of the diagram is a 555 clock, a 7493 4-bit counter and a 74154 4-to-16 line decoder/demultiplexer. This is the "sweep" part of the display that cycles through each row of LEDs. The potentiometer at the top controls the sweep speed. The net result is that the 74154 is cycling through the pins/rows, grounding each in succession. Note that I only have 14 rows, but it is counting to 16 each time. No big deal, it doesn't affect the perceived output at all.
The N2907 transistors are there to provide enough power for all the LEDs. Potentially, all 15 LEDs in a row can be lit up at once, so the transistors make sure there is enough juice.
Unfortunately, I lost the original plans during a garage cleaning after I built the electronics (the box took another few months before I got around to it). I opened it up and reverse engineered my own work. I won't guarantee it, but it sure looks right to me. The one weird thing I found is that I don't have power going to pin 8 of the 555 (as shown here), but it works fine - go figure. Also, I'm not 100% sure I got the polarity of the LEDs right, sorry about that. I would recommend testing that out first.
Please post if you build this and let me know! Also, happy to answer questions along the way.
Percussionist Ricardo Coelho de Souza performing Saariaho's Six Japanese Gardens (percussion & live electronics) assisted by Konstantinos Karathanasis at the computer.
6W RMS total output power.FM digital tuning with presets.Neodymium speaker driver for rich and clear sound.Play and charge your iPod/iPhone simultaneously.Dock any iPod/iPhone, even in its case.Time and alarm backup for on-time wakeup even with power cut.Sleep timer for easy falling asleep to your favorite music.MP3 Link for portable music playback.Auto clock synchronization with iPod/iPhone when docked
This board offers 4 channels of opto isolation. Its awesome for protecting circuits and stuff.
This board offers 4 channels of opto isolation. Its awesome for protecting circuits and stuff.
Our trip to Singapore. Visit our blog for our round the world story and Singapore at aroundtheworldwithkid.com
some better photos of the very old 2-bit noise synth project, for a friend who is interested in creating schematics vimeo.com/4290143
Design Exibition, Villa Sartirana, Giussano (MI) Italy, Mar 24-Apr 29, 2009
Bello scoprire 30 anni dopo che il gioco sul quale hai imparato cosa sia il multivibratore bistabile (il Flip-Flop, insomma) oggi e' considerato un oggetto di design...
Only one LED segment is hooked up to the driver chip. The Arduino microcontroller is making it flash on & off.