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some better photos of the very old 2-bit noise synth project, for a friend who is interested in creating schematics vimeo.com/4290143
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.
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.
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My Life Also With HOYA
We Work Together With HOYA
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Muhammad Sahal Ahmad
HOYA ELECTRONICS MALAYSIA
The circuit diagram for the solar-powered night light I made recently. Thanks to www.evilmadscientist.com et. al.
Some notes about the components.
D1 is a generic signal diode, which prevents the capacitor from discharging through the solar cell. I use some re-cycled parts in my projects - this came from a faulty power supply.
T1 is a PNP transistor, the type isn't critical. They are less common than the NPN types.
The 100R resistor limits the current to the joule thief.
T2 is an NPN type transistor, again it is not critical which you use. I've found most compact fluorescent lamps have at least one NPN transistor which can be harvested after the lamp fails.
The inductor needs to be hand-made, the ferrite ring also came from an old CFL.
D2 is a white LED.
The chip in this watch has no conformal coating of any sort. If you wanted to, you could grab those little bonding wires.
Shot through the eyepiece of a stereo microscope. Note the date on the chip- it's from 1975.
“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.
I'm at the circulation desk in a mostly empty library today, so I brought this stuff with to work on.
Один из самых мелких микроконтроллеров Atmel: 1кб флеш-памяти и 32 байта SRAM. Размер кристалла — 1620x1640 µm. Технологические нормы — 500nm.
Mixing electronics theory and knowledge of correct usage of electronic components, with their creative application