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The LED energy irradiance (mW/sr) is independent from emission half-angle?
So what these measurements are saying is that the irradiance is 10 mW/sr when measured over 0.01 sr. Since the half angles are different this unity of measurement only applies to the peak value (presumably the center). The reason is that the half angles are different and presumably the irradiance at that half angle is the same. Put another way, at 7. 5 degrees (do not you love the mixing up of units ?) you are half way to the half angle LED A but one sixth of the way to the half angle for LED B.TLDNR; No
Vizio E420i-A0 42" 1080p 120Hz Class (3.23" ultra-slim) LED Smart HDTV does this tv has web browser?
42 Inch Vizio Smart Tv
Smallest, simplest possible (randomly) flashing 2-3 LED circuit
Yes, but one CR2032? Without knowing the current draw of the leds, no way of telling how long the battery will last.Nope. These flashing leds ar not pure light emitting diodes. They are diodes, resistors, and microcontrollers in a super small package. Even with the bare eye, you can make out a small black square and bond wire(s). Under a microscope, it's even more obvious. The 5050 sized package below is a big example of it: AND to add to that, cr2032 batteries are low capacity batteries (200mAH) designed for long term small current uses. With high ESR (Equivalent Series Resistance). It essentially acts like a resistor in series with the load. You can take a bare 3.4v led, hook it up to a fresh cr2032, and it will not blow the led. For two reasons. As the current draw on the battery increases, the voltage drops due to the battery chemistry. Which causes the led to draw less current. It's a balancing act. And a 3.3v 20mA led's voltage vs current curve. 3v through a 3.3v led will limit how much current the led can draw as well. It's more complicated than that with normal batteries, but a cr2032 or similar type are a specific case. (In my experiences, even a 1.8v led with a cr2032 will not blow, because of the ESR). Heck, most dollar store led flashlights use these characteristics of leds and batteries to limit material to "case battery led". No resistor needed.
Can i hook a 120v LED to the end of a self regulating heat trace?
Sure. Just keep the power off. Turn it on and bad things might happen
60 LED chaser sequencer, two LEDs turn on at a time instead of one
Here I put the 1st Johnson counter to clock the 2nd one used as a MUX, but clock all the rest of the counters with a Schmitt trigger Astable variable speed clock. (RC0.05s for 10Hz)I put in diodes to but ran out of time to include more counters to the right and diodes to the Left to scan back and forth like this.The 4017 Counters in this simulation used RESET as negative logic , but should be positive logic. (L to enable counting)One should use the brightest LEDs possible (20Cd 20mA) as these counters only drive a few mA.Good luck. Total design and connection time 1hr
i put up a string of LED
Honestly? I put them up final 12 months after Thanksgiving and they are nonetheless up and dealing this year! Granted, i've delivered things to the yard..... Needed to put them up last 12 months after Christmas. (lawn Mower's do not like Reindeer!).
Desktop PC turns on but doesn't boot. Video card Led on
I had exactly the same problem some months ago. My OCZ Stealth X Stream was broken. I tested it with an voltage meter and everything seemed fine, but it was not . Mine made a clicking sound.However, seeing that you've already tested a different PSU, it sure sounds like it's the motherboard ( or CPU ).You could try to set up the computer without a case, and see whether that changes anything.
Why do some DC-powered LED circuits flicker?
Did you not mention what the flicker rate was? 30Hz? only on activation of brake lights? There are at least three question/answers. Now some details: Let me address some general common issues;1) Cadillac LED brake lights "were" notorious for causing eye flicker response. The cause was a PWM rate was high enough to be unnoticed when direct viewing the rear end of a stationary car, but noticeble when the car is moving while braking and more so, from your peripheral vision. Both conditions increase the human eye-brain sensitivity to flicker. This is well documented.**added* This graph shows the eye distribution of Rods & Cones. Rods, used for night vision, have a broader Field of View (FOV) from center than cones. Rods are also more sensitive but active only at low ambient light levels. This accounts for the increased sensitivity of flicker on peripheral vision at night.2) When the eyes move, the human vision is more accute to the flicker while they are in the peripheral. Once the eyes view the car directly while it is slowing down at night, they produce a stream of modulated streaks, which are stored in the retina . However the cause of both is the LED PWM intensity control used while braking, introduced by Cadillac around 2000. PWM helps to regulate the full brightness at a range of voltages such on low idle. This can be smoothened by adding a large Cap across the LEDs, but the RC time constant increases as duty cycle is reduced, so it is mroe effective when dim. given brake LED's have an ESR 500Hz would make it less noticeable."Digital projectors flash images on the screen 144 times per second, for flicker-free motion. But, as with older films, there are only 24 different pictures (frames) per second. Film projectors generally flash each image on the screen 2 times to reduce flicker, using a special shutter. Digital 3-d projectors flash the image for each eye 72 times per second upon the screen." ref
Problem with a Sony KV40XBR800, WILL NOT POWER UP 6 BLINKS ON THE STANDBY LED. PART LEVEL FIX.THANKS?
Six blinks means the thermoswitch/fuse is open and needs replaced. It's located just above the lamp chamber and monitors the temperature of the chamber.....opens if it gets too hot. But that's not the case with yours....I have seen SEVERAL of those "metal button" thermofuses open because they are Mechanical in nature....The replacements are more semiconductor material and more reliable....and yes the Sony lamp chamber is designed to use either one....the mount for the semiconductor one is not on the top but located on the side towards the actual light engine.
For the people who say Pink Floyd is better than Led Zeppelin,can PF sing "Since I've been loving you" like LZ?
Pink Floyd have never really had a lead singer. This is something they readily admit. Even Syd Barret would have preferred to get another singer on board. So in some aspects your right. But LZ cant play as well as PF. PF was a band first and foremost and a lot of their stuff had no vocals at all. They more or less narrate their songs. The 2 are completely different bands but both are on top of the heap.
ASUS Sabertooth X58 RAM LED Problem?
Sounds like something is probably wrong with the motherboard, yeah. Did you overclock the processor? If so you might try resetting the BIOS. Actually you should try that either way. There should be a button on the motherboard that you can press to reset. When I overclocked my processor at one point 2 of my RAMs stopped working. I have 2 different brands and one of them is "low voltage" and they are marketed as 1600 but their factory settings put them at 1333 so for some reason they just kinda shut off until I fixed their timings and voltages.
2 Different Power SOurces to LED strips?
Yes but you will need a little circuit to isolate the inputs. Basically a transistor that says if dome light switch closed (door open), then open circuit to music input and power through dome light switch. Conversely, if dome light switch is open (door closed), power through music system. It's easy and you can find schematics online for free
Do LED's draw only as much current as they need?
no the correct voltage is quite critical if they are voltage powered as they do NOT self regulate their current .Standard method is to power them through a series resistor or a constant current source to stabilise the current.
LED MOSFET switching circuit
Ideally, you should have a minimal if any drop across the source drain junction. The resistance should be under 1 ohm, and the voltage should be a fraction of a volt. But it depends on the current you are passing through it. The datasheet will show the Rds when on. You should be pretty close to your target Vf and If if you ignore it, but you could measure the drop across, and current through the mosfet when on, then recalculate
How does "Going to California" by Led Zeppelin make you feel?
It is an awesome song
Can I take any blue LED lamp and grow?or are there some LEDs special for growing?
Those lights are perfect for all of the legal "plants" you are planning to grow *wink* *wink* *nudge* *nudge*
Is There Any way to Make LED
flip the switch on and off?
Design help! - Play a pure tone into a mic and depending on its frequency a specific LED will light up
To detect the frequency of a relatively pure tone you do not need filters. All you have to do is convert the fundamental frequency into a voltage, using a frequency to voltage converter such as the LM2907. You can then fed the voltage output into an LM3914 dot/bar LED display driver.
Why is my LG LED LN54 making a buzzing sound?
confusing aspect. research on to the search engines. this can assist!
In an LED circuit, do I have to put a resistor before every switch?
Sometimes!The reason for resistors is to make sure you don't blow out the LED with too much current. I'm assuming your power is coming from 5v regulated from something like an Arduino Uno.You basically just want to size your resistor based on how much current the LED can take. You should be able to find this out in the LED's datasheet.If you're just messing around with a breadboard, just see what happens when you don't use a resistor. That's the best way to learn electronics, but don't do this with AC from the wall socket until you're way more experienced! Don't be afraid of ruining some components. You'll probably notice the LED is a lot brighter, and then it might not work later. Experimenting like this and seeing for yourself is the best way to learn
RPi 2 GPIO LED wont turn off! [duplicate]
The GPIO Cable was plugged in backwards causing the LED to stay on. You want the GPIO cables lined side to be facing the SD port. Then everything will work!Thanks to goobering for helping solve this.
How does the bass playing of The Band's Rick Danko's differ from that of Led Zeppelin's John Paul Jones?
Rick Danko played a variety of styles to suit the particular song. He was also a vocalist, either lead or background, so that would limit the degree of difficulty in his bass lines. He also played, primarially with Levon Helm on drums, who was direct, tasteful and again, played to the needs of the song. John Paul Jones was a gifted musician, but in the world of arranging songs. Bass was not his chosen instrument but he agreed to handle those duties when recruited by Jimmy Page to join Led Zeppelin. Volume was the main ingredient to his style in the band and having to play along side Bonzo, who brought the thunder, he had to fill gaps and allow space for the others to do their thing. It was a quiet relationship and there couldn't have been a better person to play bass for Led Zep
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