Asked by Andy Blackwell Uncategorized
Will led tv 220v 50hz run on 230v 60hz?
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Which resistor is connect 1.5 volt led to series 220v ac?
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Can you apply 230v directly to the strip of 16LED?
Would not recommend it. If you don't want to blow out your lights (yes, LED lights can do that too), you need to neck the current down to the recommended amperage for that light system, which is going to require a fuse or circuit breaker. Also, you need to have the appropriate voltage going to it.. 230v seems a bit high for just a 16 LED light system.
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Will a eurpean samsung led tv work in us?
Not without some serious modifications !... The mains voltage is different to Europe. The frame rate is different - 60Hz in america 50Hz in Europe The number of lines that makes up the picture is different and The built in tuner is not compatible. Although you could get it modified by a technician, the cost involved would be better spent on a new TV once you got there !
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It will be exposed to 20% more stress because the current alternates 20% faster. The appliance's lifetime will be reduced. Answer The frequency of the supply does not 'cause stress' to a circuit, and it does not necessarily shorten the lifespan of the appliance! In fact, most electrical loads will be unaffected by this increase in frequency; many devices, such as mobile phone and laptop computer chargers are designed to operate over at both frequencies. Heating loads will be unaffected. Motors may be affected -depending on the type of motor, their speed may increase. Appliances, such as stoves, with LED time displays may have their time displays speed up and become completely inaccurate.
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LED G9 lights from Shenzhen GoSun LED LTD. Product Feature: (1)LED Brand: Epistar. (2)LED Qty:48pcs SMD3528,18/27pcs SMD5050. (3)Lumen: 270-405lm. (4)Beam Angle: 360°. (5)Voltage: AC120-230V. (6)Color: Pure white, warm white, Red, Green, Blue, Yellow. (7)CCT: 2500K-12000K are optional. (8)Size:Φ32 XH58mm. (9)Certificate: CE, RoHS, CCC. (10)IP Rating: IP40 (11)Warranty:2 years. (12)Life span: 50,000+hrs. Pictures: WWW.GOSUNLED.COM
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How does an NTSC video signal synch on 50hz power mains?
Many years ago, television standards were chosen to be in line with mains frequencies to avoid interference between mains and video signals. In some cases, mains was used as a timing signal but mains instability soon led to independent timing. Improvements in electronics in later years helped to avoid some of the common causes of interference between mains and video signals. Although the need to have the two running at the same frequency was removed, the standards had been set - North America settling on 60Hz and Europe on 50Hz. With the introduction of color systems, North American signals were changed to 59.94Hz with NTSC color encoding. Although the frequency change is tiny, it marked the end of the link betwen mains and video frequencies. Europe did not change from 50Hz and introduced PAL as the color encoding standard. Television equipment no longer needs mains to be linked to video frequencies and therefore any frequency of video signal can work in any mains region. For many years, broadcast equipment has been capable of running at 50 or 60Hz although domestic televsions rarely had multi standard signal handling. NTSC material generally could not be used on PAL televisions, nor could PAL be used on NTSC televisions The recent advances in television technologies has resulted in many domestic players and televisions being able to handle both NTSC and PAL signals. However, commercial pressures mean that most television content is now encoded with regional identities. The result is that although equipment is perfectly capable of displaying material, regional coding prevents DVDs bought in one region being played in another region.
Asked in Electronics Engineering
What value of resistor to light a LED on 230 volts?
To figure this out, you need to know the expected forward voltage and current of the LED. Lets assume 2ma and 2V. (Actually, 2ma is small, but I intend to make a point.) By Kirchoff's Voltage Law, you know that the signed sum of the voltage drops going around a series circuit must add up to zero. This means that the voltage across the resistor must be 228 volts. (-230 + 228 + 2 = 0) By Kirchoff's Current Law, you know that the signed sum of the currents entering a node is zero. As a consequence, you also know that the current at every point in a series circuit is the same. Therefore, the current through the resistor is also 2ma. By Ohm's Law, you know that resistance is voltage divided by current, so you know that the resistor is 228V divided by 2ma, which is 114K. The nearest standard value in the E12 scale is 100K. Recalculate the current for 100K, and you get about 2.25ma. (You could also use 120K, and I'll let you run the calculations yourself.) Don't stop here. There are some issues... By the power law, you know that power is voltage times current, so you know that the power dissipated by the resistor is 228V times 2.25ma, which is 513mW. I would put a one watt resistor in there. However, consider this. 2ma is a low current LED. Some of them pull 25ma. The power in the resistor in that case is about 6.5W, which is getting pretty high. Secondly, you need to consider the reverse breakdown voltage on the LED. I assume that when you said 230V, you meant AC, not DC, which means that there is going to be 230V (actually, a peak value of 325) across that LED for one half the line cycle. You need to check the datasheet and make sure the LED can handle that. If not, you need to put an ordinary signal diode, such as a 1N4148, in parallel with the LED, in the reverse direction, so that it clamps the reverse voltage at about 0.7 volts. (Don't worry about the reverse breakdown on the 1N4148, because the LED will protect it, on opposite half line cycles.) Last, but not least, you need to consider the safety of the operator. 230V is a high voltage, and LED's are not the most rugged thing around. If the LED breaks, you need to consider if its internal wiring could come into contact with the operator. I would certainly demand a UL listed device in this application.