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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.
Один из самых мелких микроконтроллеров Atmel: 1кб флеш-памяти и 32 байта SRAM. Размер кристалла — 1620x1640 µm. Технологические нормы — 500nm.
Made some progress with the 603. The intensity control was being disabled by a dead 2N3904 on the Z amplifier board.
But clearly there is more work to do on Y linearity.
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.
“안전, 편의성, 스타일 모두 갖춘 가스레인지”
■ 유해가스와 불꽃 없이 광파 버너로 상판을 가열해 빛으로 음식을 조리
□ 기존 가스레인지 보다 일산화탄소 96% 감소…유지비도 최대 40% 절약
□ 삼발이 등 부속품 없애고 독일 쇼트社 세라믹 상판 적용해 청소도 간편
■ 고온 주의 램프, 2시간 자동 소화 등 안전기능 탁월
■ 제품 전면에 스테인리스 소재 디자인 적용해 고급 주방 가전, 가구 등과 조화
■ LG전자 송승걸 키친패키지사업부장은 “안전, 사용 편의성, 스타일을 겸비한 ‘광파 가스레인지’를 통해 프리미엄 조리기기 시장을 적극 공략할 것”이라고 강조
※ Social LG전자 (social.lge.co.kr/newsroom) 에서 관련 보도자료를 확인하실 수 있습니다.
Our trip to Singapore. Visit our blog for our round the world story and Singapore at aroundtheworldwithkid.com
I got bored and took my card reader apart. It bugs me that they don't make these things smaller. The plastic casing around this makes it twice as thick, an extra third in length, and ugly.
Snapshot from the third issue of my webseries "Bleeping Relics" about the 1978 Handheld "Soccer", manufactured by Mattel Electronics.
Watch the episode here:
www.youtube.com/watch?v=xABfSvcbLwA
Shot with a Pentax K-5
by Doug Kline
If you're interested in higher resolution versions of my images for journalistic or commercial purposes, contact me via my profile page.
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...
Please note that a new hardware version of this device has been released, therefore these images will most likely not apply to it.
Mrs. W. is taking a yoga class and they're doing breathing exercises. One of these is the "breath of fire" which involves rapid breaths, five every 2 seconds.
Just for grins, I'm building a little LED blinker circuit which blinks at that rate so that she can breathe along with it! And it will be relatively portable.
Based on an ATTiny84 microcontroller, which is absurdly overpowered for such a task, but I had some lying around and using one allows the circuit to be reprogrammed to allow for different blink rates selected by the push-button. Currently the circuit does the 2.5-per-second blinks or 1 per second.
The final product will be housed in the Altoids tin shown and powered by 4 rechargeable AAs. That is, again, overkill, but I had them lying around.
The switches in the bag are a kind I remember buying at Radio Shack around 1980, and I was hoping that my favorite electronics joint had something like them. As luck had it, they had exactly them! A small but noticeable chunk of Ra-Elco's stock is Radio Shack stuff that I guess was left behind when one of those closed up about 25 years ago. Maybe it was the one in Ogden where I bought the swicths I bought long ago - that one disappeared around then!
In fact, one such swicth was the FIRE device for Tank Battle.