How Much Voltage Does a Led Need?
The typical voltage for a display LED is about 1.5 to 5.0 volts, forward voltage. Be sure to always use a properly sized resistor when connecting your LED. Never connect it directly to a battery or power supply, as it will burn out almost instantly.
1. The New Samsung LED TV's?
I disagree with above poster. Led is way better than lcd & plasma. As the best brand for led, I would say samsung is the best followed by sony & sharp. I do not have led (I only have lcds & plasma) but when I compared led with lcd & plasma on electronic shop, I can see clearly that led is way better than lcd & plasma. They used xbox 360 games & bluray movies as references. As for the tv comparison; they use samsung led, lcd, & plasma.
2. Are Americans So Easily Led / Fooled as the Appear to Be?
They are like sheep just begging to be led to slaughter
3. How do I model an LED with SPICE?
As you stated, there are 3 parameters that dictate the DC response of a diode. Those are the saturation current (IS), the emission coefficient (N), and the ohmic resistance (RS). I was able to fit the curve with a fairly high accuracy, so I will document my model procedure. The SPICE model for the diode closely matches the Schokley diode equation:where Vt = kT/q = 26mV at room temperature.The first thing to do is to get a ballpark estimate of RS to use in the more accurate solutions. You can calculate the effective value of RS from the datasheet values by back-calculating for Vf using the measured If. The voltage difference between the input value and the calculated Vf can be used with the forward current to generate a resistance. At the higher currents, this will be a good starting value.To plot the diode current using RS, you need to first calculate the diode Vf given a voltage for the resistor-diode series combination. Wikipedia lists an iterative function - it converges easily if the resistor voltage drop is significant. This function was easy enough to set up in Excel. For Vf values below 1.8, I hard-coded the input value because the iterative function did not converge. Then take this Vf value to calculate the If of the ideal diode. I plotted this with the original datasheet graph.Using trial and error, you should be able to get a RS value that gets pretty good overlap with the datasheet values. All that's left is to throw the model together in SPICE to verify your work. Below is my diode model that I verified using HSPICE. The simulation data is almost a perfect overlay for the datasheet graph. I used this article, which helped a lot with the diode spice parameters.I cleaned up my spreadsheet, and tyblu has made it available for download here. Use at your own risk, results not guaranteed, etc. .. etc.
4. What circumstances led up to the Protestant Reformation?
It was a number of things and the immorality of the Catholic Church elite told those moral with attitudes that the Papist were a sordid lot seduced by wealth and power. The truth has and always will be a stronger motivation than lies. It was the advent of Martin Luther's love of the truth and the printing press that added power to the Reformation, then came the Bible that King James made possible that produced a Bible in the language of his people and no other Bible has out done its influence. These are some of the things that help brake the power of the popes. But there is one thing that the Catholic Church initiated in this world that no other could afford, it instituted the first universities of higher learning
5. What is better, Mi LED TV or Samsung LED TV?
Hi,Let me answer the question in short.If you want a 4k and a bigger size TV in a lower price, Get the Mi's and if picture quality is the main concern and do not mind spending extra money, Go for the Samsungs.If you do not watch Bluray or Bluray quality rips or do not play console games mostly, an Mi will bring you more happiness and you can save a lot of money too.For nitpickers in picture quality, less input lags and for good HDR performance, I would strongly push them towards Samsung or other brands.
