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How do you make mini-lights (LED) /
Buy LED tube lights. They are cheaper than trying to buy individual components and assembling yourself
Why is my Toshiba LED 47L2400EE 47" showing nothing at all but a black screen?
Shine a torch at the screen when the TV seems like it should be on, do you see anything like a picture behind there? The backlight could be blown.Otherwise the TV could be not turning on, it could be the power supply or a corruption of the main board.Why is my Toshiba LED 47L2400EE 47" showing nothing at all but a black screen?.
LED Array and Resistor Question?
4 x 3.3 is 13.2 volts. That is above any of your supplies, plus you need a few volts for the resistor. So I would use two strings of two LED's each. 2 x 3.3 is 6.6 volts. Plus a few volts for the resistor gets you 8 volts. So I would use a 9 volt supply. 9-6.6= 2.4 volts. R = 2.4/.025 = 96 ohms, so use a 100 ohm resistor. Power in the resistor is IÂ²R = 0.06 watts, so you can use a 1/4 watt resistor. 100 ohms 1/4 watt (you can use 1/2 watt) resistors are available everywhere. Remember you have 2 strings so you need 2 resistors. You always need a resistor. An alternative is 4 strings on the 4.5 volt supply. R = 1.3/.025 = 52 ohms. But this only has 1.3 volts across the resistor. May work, may not. .
Whirlpool Fridge-Freezer, " H20 " LED Flashing, does water filter need changed?
The flashing LED is simply a reminder to change your water filter. It does not mean that your filter is dirty or clogged up. The light flashes based on the number of times that you open the refrigerator door. To turn off the light, I believe that you have to press the door light button 5 times rapidly. This resets the counter until the next time you have opened your door X number of times. I usually change the filter every third or fourth time I see the flashing light or about every six months. The filters are way too expensive to replace every time the flashing light comes on
What are those cops that have regular cars but LED Lights?
In my area every emergency vehicle now uses LED warning lights. They use less amperage than the old lights, they have more eye catching flash patterns, they are brighter and can be seen for longer distances. The vehicles you refer to are more than likely unmarked emergency vehicles. In my area members of a volunteer rescue squad or fire department can be equipped like that. In my area undercover police vehicles are also equipped like you describe. Also an off duty police officer may have their personal car equipped like that to respond to an emergency call out. You were observant to notice their was more than one vehicle. Any time you see one emergency vehicle be on the close lookout for a second or third.
Replacing the standard LEDs in a Â£10 led torch with 4x 1w LEDs?
www.tank007.com, ceck with them
Why should you use two resistors in parallel on an LED?
Additional to all the valid point given already, another reason could be a better heat dissipation. Since these resitors are limiting current on a LED they could probably get relatively hot, given their small size. In this case the power they absorb is around 20mW. Having two items instead of one allows for better heat dissipation
LED strips: 46% resistive losses?
First "560" on a resistor means 56 Î©, not literally 560 Î©. This is essentially a floating point format. The last digit is the exponent of 10 to apply to the integer value formed by the previous digits. "560" therefore means 56 x 100 = 56. Yes, this LED array is quite inefficient. If that's a primary concern, do not use it. It seems the design was optimized for cost. I expect it was cheap, so you got what you paid for.
How to power an LED light on the ground side of a 5A DC brake line lock solenoid as visual indicator it locked?
I understand what you are trying to do, but monitoring the solenoid with an LED is going to be difficult without adding some other circuitry to monitor current flow through the solenoid. You really s
Is it illegal to have blue NON-BLINKING LED or NEON lights on the SIDE of my motorcycle in Illinois?
I have blue LED lights on my bike and they have been personally inspected by two county sheriffs of two Texas counties. (one with a state trooper in attendance) They all 3 said as long as the light cannot be seen from the front or rear, and they do not wig-wag (thats copspeak for blink left and right), then everything is fine. That may not be the case in states that exclusively use blue for their emergency vehicle lights designation. (North Carolina would be a good example)
Tow LEDs are to be connected in series to double the light output. Each LED requires 1.4 volts at 12 mA.HELP?
Voltage = 5 V, Led = 1.4 V 12mA Total voltage drop allowed is 2.8 V 5 - 2.8 = 2.2 V, which must be dissipated by resistor V / I = ohms 2.2 / 0.012 = 183.33 Ohms. Power dissipated = V x I 5 x 0.012 = 0.060 or 60 mV
Can We connect LED on AC line
If an ideal diode is given 17 mV more voltage, it draws twice as much current. Only very non-ideal diodes would survive in the AC connection shown, because an AC line may (even if there's local protection) have occasional peaks, nearly 1V across each diode. Even a line-voltage allowed variance, of 10%, would make a normally biased (3V) LED see 3.3V, and that causes a current excursion of a factor of 2**18 (about 250 thousand times) the 'normal'.What one CAN do, is put a series inductor, similar to a fluorescent lamp ballast, into the circuit. Then, instead of 10% voltage deviation causing 25 000 000% current increase, it causes 20% current increase.
Connecting 220V mains switches (with on-indicator lights) to 12V COB LED lights in series
It all depends on how you wire the switches. I would guess that the two silver terminals are the actual switch contacts, and the brass terminal is one end of the light. The other end of the light is probably connected to the center terminal (but that's only a guess. ..)If you just use the switch contacts (silver terminals) the LEDs should light at full brightness. The light included in the switch will not light with only 12 volts, if it is intended to work on 220 V
Why can't you use certain LED bulbs in enclosed fixtures?
Because they need to be wired differently some fluorescent LEDs have the neutral on one end and live on the other and some have both on the same end, also some require taking the ballast out of the fixture
What resistor do I need when using LED's on a car (12volts)?
First of all, wire them in parallel, not series. Then they should all be the same brightness. Also, when one goes out, they wo not all go out. Secondly, the resistance needed depends on what kind of LEDs you are using. Different colors have different power usages.
White LED in front legal?
First of all, that is really cool. I have a Mitsubishi too and might have to steal your idea. Anyways, no that is not illegal, unless you've pissed off a cop and he is looking for something to ticket you on. A lot of cars (Like new Audis) have what are called Daytime Running Lights (DRL's) which are an LED strip, usually white, right below the headlights. These are used just to make it easier for other motorists to see your car, and are perfectly legal. If a cop does have a problem with your lights, tell them they are daytime running lights. But simply, no, that is not illegal
how much does a incandescent and LED light cost?
Typically, an incandescent bulb costs Php35.00 while an LED costs less than Php3.00 (Php is Philippine Peso)
i HOOKED UP MY LED ON A TOGGLE WITH POWER RAN FROM MY BATTERY BUT THE SWITCH LIGHTS BUT NO LEDS?
leds will not work if you have the neg lead on the pos. side and viseversa. red= black= neg. btw turn the caps off no need to yell
Deciding On A Resistor For an LED
200 mA will kill it in short order. That's the Absolute MAX.100 mA and 65 mA are the nominal recommended max currents.Formula for resistor is:(V Source - V LED Forward Voltage) / Target Forward Current (Vs - VF) / If( 5V - 3V ) / 0.1A = 20Î©22Î© gives slightly less than 100 mA (2V / 22Î© = 0.09A) will really not be noticeably dimmer, and will help ensure the stated life of the led is met. A target of 65mA might be better. 2V / 0.065A = 30Î©. As points out, enclosing the led in a tube, on thin wires, is not the typical application the manufacturer expects (on a pcb board with adequate landing pads/copper sizing, and certain free air/distance).Since you have 2 volts across the resistor at 90mA, that's 2 * 0.09 = 0.18 Watts. You will need a 1/4th Watt resistor. So smd resistors are right out unless you go with two 44 ohm 1206 (1/8th Watt) resistors in parallel. So stick to 1/4th or 1/2 Watt through hole resistors.Keep in mind, the original instructable used a 0805 20mA led. You want a 3535 led, thats normally 5 times bigger light area and 5x more current. It will be particularly bright and blinding in comparison. You will want to play around with one to find out a good brightness. Use a few resistors to test. Between 30Î© and 200Î© before finalizing which one. And the more current used, the faster your usb power pack will drain. At 50mA you will have twice the battery life of 100mA, generally speaking.
Dim and âunblinkâ a pc power LED?
It's quite simple: - No soldering, nor CE labels, no messing around. No DVM required for testing. Plus you got refills by the dozen so next time you have a too-bright LED it costs nothing but time remembering where you slid the pack of these little beauties.It costs about 4 quid from here and here's the originator's web site.Do not try it with high power lasers though (I mean... who would?).
Parking light replacement - Halogen to LED?
led lights are going to look strange also... you need 12v/5W component type LED setups. that simple. what the model/cat numbers are going to be.. you gotta look at the company or ask the distributor/seller.
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