Do you want to know about led light? Here are some frequently asked questions.
1. Motorola hs820 bluetooth headset LED light problem?
Not sure what you mean when you say you push down the "talk" button but I assume you meant the off and on button. If so, the light should only stay on when charging. If it is on after charging you probably have it in sync mode or its defective. When you turn it on, it should blink multiple times rapidly, at this point let go of the button and it will be on...blinking every few seconds. If you hold the button after the quick blinking it will go to sync mode. If you have done as above and it is still on then you need to return it to your place of purchase for an exchange. Hope this helps.
2. can an LED light bulb be dimmed? Can it be run on less wattage that it's total output is?
Yes, a LED can, and will dim at low voltage. This can be minimized by a circuit having a Zener diode and resister, parallel to the Led(with resistor). It is difficult and expensive to get LEDs with lighting capacity (lumens) of a halogen. Adding batteries may be the simplest. You can buy battery devices at radio shack that use rechargeable AAs, for a couple dollars. A lead acid battery would have much more capacity, but they seldom last more than a year in ATVs.
3. a small round battery powered led light flew off my dresser on the ground and broke exactly when my sister in law walked by my room. How?
Big lady tipped the house over. No, just coincidence. Do not tell her I said that. I do not want her turning me into a frog
4. how do i change the led light on blackberry curve 9360?
Advanced OS and LED is another app that lets you customize your LED. And...it's free and packed with all sorts of goodies included the ability to screenshot, wallpaper changer etc
5. how do i keep the led light on on my lg shine?
Well if you go to the settings section on your phone you can usually change how long the light remains on, but even that will only go up to 30-45 seconds
6. if a 100 watt incandecent bulb is equal to a 23 watt Flourecent than a 21 watt LED light is equal to what?
Look at the output in lumens. A 100W incandescent lamp and an equivalent fluorescent lamp give around 1750 lumens. Your LED could be anywhere (expect it to be between 840 and 1600). 60W incandescent lamps give around 825 lumens. Also look at the color of the LED if they have it. 6500K is white(ish). Anything higher than that is pretty blue
7. What do I do if a LED light strip is too long?
Buy a shorter one!!!
8. A way to make water steam diffrent colours. Help please!?
color changing LED light that is waterproof
9. i have alot of led light in yard but have themon one power switch i need 1 large photo cell 12 volts?
Your question is very difficult to read, but I gather you want a photo cell to control some lights? Use the photocell to drive a relay that drives the lights. .
10. t-mobile g1 led light help?
ppt.sta in cmd may help
11. I need a design for an LED light sequencer? Need to light about 60 columns of LEDs, one column at a time.?
Logic circuitry and ucontrollers are not going to be able to drive the LEDs: not enough current or voltage capability. You will have to have drivers to handle the voltage/current. Also, simple shift registers can handle the logic without having to program a ucontroller or programmed logic. I like minimalist designs, so I would start by dividing the LED's into 8 banks of 8 each, except 4 in last bank. This gives 60 LED sub-circuits, with a max of 64. The banks are driven by a high (positive) side circuit, and a low (negative) side circuit. The high side has 8 PNP (actually, I prefer P-type MOSFETs) transistors to drive the banks. So, first PNP transistor drives all 8 LED (sub-circuits) in the first bank, and other banks similarly driven, each by one transistor connected to all 8 (or 4 for the last bank) LED sub-circuits. On the low (negative) side, use 8 NPN's (or N-type MOS) transistors to drive sub-circuit selector. The first sub-circuit in each bank is tied at the bottom to the first NPN, i.e. drives all 8 LED sub-circuits. Similarly, sub-circuits 2,3,4, etc. in each bank are connected to the corresponding NPN. Basic circuit works by enabling single high side transistor and single low side transistor to select LED sub-circuit to actuate. So, 8 bit shift registers are used to drive the high side drivers and the low side drivers. The low SR shifts a single enable bit (logic one) through, while the high side SR shifts a single enable bit (logic zero) through. This polarity is reversed because PNP have reverse logic from NPN. A simple 555 timer circuit can be used to clock the low side SR; use a CMOS one for wider timing range. The ripple out from the low side SR drives the high side SR clock. Select 555 RC values to give desired pulse rate; this will automatically be uniform across all the columns. Use 10 turn pot to allow you to change timing by very small increments. Set up reset on high side SR to reset after 60 rather than 64. You need to design resets and presets to properly start and reset circuits for both low and high side. Set up the LED's in series-parallel for each sub-circuit, perhaps 4 x 10 or 5 x 8 for each column. Many folks like a resistor in series with each leg to limit current. I would try to go with 12, 15, or 24V to minimize current, but depends on ratings of transistors used and LED voltage/current requirements. Get the datasheet for your LED; I prefer to use accurate voltage supply rather than dropping resistors where LED characteristics allow it. Use an adjustable voltage regulator supplying the high side drivers to adjust voltage across the LED's precisely. Good luck! Edit: Chances are, this circuit is not available unless you can modify an LED clock circuit. Perhaps you should google something like "digital clock" or LED clock. There are some that use LED's in a 60 column configuration. They are not going to have sufficient current, but otherwise would work. If you insist on proceeding, first step is to select your LED's, as the design progresses from the drive requirements. You need an LED with a datasheet, as to safely do the series/parallel thing, you need details of the LED performance. You will need to consider how to package the circuit. For prototype circuit, proto-board is the most practical. Once the circuit is tested and finalized, if you want a permanent circuit, you can make a custom PC board. Expecting someone to design and test a complete circuit for free is not very realistic. Without some interest and expertise in electronics, this will be a difficult project. Perhaps you can find a "ham" amateur radio group in your area that can help with building/testing the circuitry.
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