View allAll Photos Tagged Electronics
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.
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.
“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
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
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.
Photos I took at work of a D3300 taken using a D3300 and 50mm f1.8 lens @f16 for use in a training presentation.
This was shot in aperture priority using daylight from a large window which was about ten feet (3 meters) to the rear of the camera and 2 large sheets of white card as a base and background.
This D3300 has the newest AF-P 18-55mm kit lens which has the VR and A/M switched removed and the functions area now found in the menus.
The images was then colour balanced and cleaned up in Photoshop CC
Only one LED segment is hooked up to the driver chip. The Arduino microcontroller is making it flash on & off.
Three Tektronix 7B8x time-base plugins. Top and bottom are 7B80 (bottom has option-02) and the middle is a 7B85. Based on inspection of the schematics and the actual boards, it looks like upgrading a 7B80 to 7B85 would be fairly straightforward.
From a 1331A XY monitor. Stock number 5083-2578.
More details on CRT manufacture in this Tektronix video (1955): www.youtube.com/watch?v=q5dhfhMItQc&feature=youtu.be