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68 Threads found on Illumination
Hello, I'd like to be recommended a chip, with 100 ~305 V input and 12~36V output. The output current is expected to be in the 20A grade, that is 20A max, it works at around 2~5 A I'm using it to drive an array of LEDs for illumination as well as branching one for my MCU. I'm looking for isolated solution, but non-isolated are also welcome
Hi guys, currently, I'm working in the design of a small robot for a nice personal project. I would like to put a feedback illumination signal, and I like a lot the effect I saw some time ago in a Disney park (please see video attached). As you can see in this small video, it's basicaly a light spinning continously, I can't see any discrete l
Assuming a constant slope in double logarithmic R versus illumination plot is just a simplification. In contrast to the 0.75 slope given by vGoodtimes, I see "gamma" numbers of 0.8 to 0.95 for PE/Excelitas photocells. Real LDR photocells have more or less bent curves in the double logarith
Hi All, I need to design 36" x 9" in cassegrain configuration operating in E-band (Narrow bandwidth). I know how to design regular casssegrain but in this case I'm worry about the horn/sub-reflector blockages. Is splash plate design possible for proper illumination for that fan beam? It would be great if I can remove the spa
what are texture and illumination in image? These are texture and illumination in image.
Consider trying a buck-boost converter. By varying the duty cycle, you step voltage up or down. Naturally you cannot break Ohm's law, which means you cannot expect to get more watts out than you put in. Therefore if you step up voltage, you step down Amperes. At times when illumination is dim so that panel voltage goes below 15V, it also puts out
Usually when having many equal LEDs such as for illumination purposes one connects multiple LEDs in series. That usually simplifies the driving electronics, but requires also a higher feeding voltage, as all LED voltage drops in one string are added up. For instance for a white LED a rule-of-thumb forward voltage is 3V or thereabout. (you should co
RED LED's on a wristwatch and calculators begain in the early 70's when we were using sliderules. I recall effective illumination it took the emergence of HB LEDs which instead of GaAs or GaP used combinations of dopants such AlInGaAs in addition to transparent substrates so the bottom emissions would be reflected back out the front. I think th
For an optically switched transmission line, can anyone suggest me for an optimum gap dimension or perhaps any specific design to start with, in order to construct a gap structure which is basically a Si switch, activates (conducts) during illumination and remains open in dark conditions (in CST). And also if someone has already been able to demons
That is complex way to turn on a led. If there is no feedback from lumens reaching the target, illumination will not be very constant as desired due to temperature/distance... Or, keep it simple---->
For vi characterestic of solar cell can anyone let me know that if in illumination type i apply a forward voltage source in across it,and then starting from 0 if i increase the voltage source i will get a current from n- p first ,then p-n i.e photogenerated current and then diffusion this wrong????because in most cases i saw that while
I am trying to simulate a cross-slot nanoantenna. The relevant paper is attached. The design: 101769 The problem Im facing is how the authors were to able to excite the structure? They mention in the paper that " the structures are formed on SiO2 substrates with gold metal patch having no ground, and they are illum
an you also observe that the intensity of an incandescent bulb also changes when this voltage change? Often multimeters show wrong readings because the output is not pure sine wave. A bulb can show the power by its illumination.
illumination LEDs are generally current-controlled and the Vf is almost a "throwaway" parameter - unless you intend to match parallel strings, in which case you care about something the manufacturer doesn't, so much - hence binning rather than process control.
So you mean, the light will be always modulated in a 36 to 40 KHz frequency range. Or the light will be always sourced from a remote control, which excludes continuously modulated signals (e.g. an IR light barrier). Or the light may be unmodulated IR as well (e.g. IR illumination for a camera)? Unfortunately you didn't say that clearly yet. Seco
Feature extraction is a very broad subject area! Depending on your application, it might be good to focus on using scale-invariant, rotation-invariant, and illumination-independent features. Do you have a target hardware platform, software development environment, and programming language? Many of the relevant scientific papers are
For experimentation, try gathering the fibers into a short length of heat shrink tubing, position the ends firmly against an LED, then heat the assembly to secure it (or wrap tape around it). It may be tricky to get adequate illumination through all the fibers. With a 24V signal you need to add a safety resistor, to prevent the LED from frying.
You need to study the photovoltaic panel itself before the charge controller. Briefly: As current is drawn from the panel, the panel voltage drops, not necessarily in a linear fashion. So, there will be a point (voltage, current) at which the maximum power is transferred; where P=IV is a maximum. As the illumination changes, this point changes, so
Wavelength is irrelevant other than consistency with the detector. People also do passive window-vibration-optical pickup, in order to not have a telltale illumination. Go look at your photodiodes, any of them will have a detection efficiency curve somewhere inthe datasheet or app notes and most in the description at electronics distributors. Ab
I need a valid reference of how many lux is needed for room illumination during PRESENTATION using projector (e.g. in classroom). I know 250 lux is enough for studying room, but for presentation, I think it should be less than 250 and I dont know the exact value. Can somebody give me one??