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Reviews with images
Works great so far, replaced YL1200500 AC adapter.
This YL1200500 cable amplifier originally powered a 9-port Cable TV splitter amplifier that Time Warner Cable (now Spectrum) had installed at our house 9 years ago. We later "cut the cord" and got rid of our cable TV subscription and I mounted an outside over the air TV antenna and connected it to this same TV splitter, which distributed OTA TV throughout our house cable wiring. Everything worked fine until late last year when two channels from the furthest broadcast TV tower channels started cutting in an out intermittently. I initially blamed it on the Winegard preamplifier attached to the outdoor TV antenna and replaced it, but the problem continued.Eventually I figured out that it was really the power supply to the TV splitter amplifier, this YingJiao YL1200500. It was running really hot, and taking it off and letting it cool could bring it back to life. The thing is pretty heavy, indicating it has a pretty heavy duty iron core transformer inside. I was going to get another one of these on eBay, but then I saw this model on Amazon. Another review had indicated that this one was much lighter, which I didn't think was necessarily a good thing, until I saw the High Efficiency Level VI energy rating. That actually turns out to mean something! Less wasted power draw when the adapter is not being used!It turns out that these newer High Efficiency AC power adapters use the high frequency Switched Mode Power Supply (SMPS). Instead of sending the high voltage low frequency (60Hz) first into a heavy duty transformer to step down into a low voltage low frequency current, the SMPS uses a transistor switch to convert the house AC current into a high frequency high voltage current that can then be run through a much more efficient low mass transformer to do the step down into a low voltage high frequency current. This is then converted into low voltage DC current. This is why these newer AC power adapters are so light, because they no longer need these big heavy transformers. These efficient SMPS power supplies were first used for computer power supplies, and now they are pretty standard circuitry for the multitude of small AC adapter bricks that we use for all our personal electronics.Anyway, so far so good. The TV channels are all back again.
Top reviews from the United States
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Reviewed in the United States on January 9, 2023
Eventually I figured out that it was really the power supply to the TV splitter amplifier, this YingJiao YL1200500. It was running really hot, and taking it off and letting it cool could bring it back to life. The thing is pretty heavy, indicating it has a pretty heavy duty iron core transformer inside. I was going to get another one of these on eBay, but then I saw this model on Amazon. Another review had indicated that this one was much lighter, which I didn't think was necessarily a good thing, until I saw the High Efficiency Level VI energy rating. That actually turns out to mean something! Less wasted power draw when the adapter is not being used!
It turns out that these newer High Efficiency AC power adapters use the high frequency Switched Mode Power Supply (SMPS). Instead of sending the high voltage low frequency (60Hz) first into a heavy duty transformer to step down into a low voltage low frequency current, the SMPS uses a transistor switch to convert the house AC current into a high frequency high voltage current that can then be run through a much more efficient low mass transformer to do the step down into a low voltage high frequency current. This is then converted into low voltage DC current. This is why these newer AC power adapters are so light, because they no longer need these big heavy transformers. These efficient SMPS power supplies were first used for computer power supplies, and now they are pretty standard circuitry for the multitude of small AC adapter bricks that we use for all our personal electronics.
Anyway, so far so good. The TV channels are all back again.
Works great so far, replaced YL1200500 AC adapter.
Reviewed in the United States on January 9, 2023
This YL1200500 cable amplifier originally powered a 9-port Cable TV splitter amplifier that Time Warner Cable (now Spectrum) had installed at our house 9 years ago. We later "cut the cord" and got rid of our cable TV subscription and I mounted an outside over the air TV antenna and connected it to this same TV splitter, which distributed OTA TV throughout our house cable wiring. Everything worked fine until late last year when two channels from the furthest broadcast TV tower channels started cutting in an out intermittently. I initially blamed it on the Winegard preamplifier attached to the outdoor TV antenna and replaced it, but the problem continued.Reviewed in the United States on January 9, 2023
Eventually I figured out that it was really the power supply to the TV splitter amplifier, this YingJiao YL1200500. It was running really hot, and taking it off and letting it cool could bring it back to life. The thing is pretty heavy, indicating it has a pretty heavy duty iron core transformer inside. I was going to get another one of these on eBay, but then I saw this model on Amazon. Another review had indicated that this one was much lighter, which I didn't think was necessarily a good thing, until I saw the High Efficiency Level VI energy rating. That actually turns out to mean something! Less wasted power draw when the adapter is not being used!
It turns out that these newer High Efficiency AC power adapters use the high frequency Switched Mode Power Supply (SMPS). Instead of sending the high voltage low frequency (60Hz) first into a heavy duty transformer to step down into a low voltage low frequency current, the SMPS uses a transistor switch to convert the house AC current into a high frequency high voltage current that can then be run through a much more efficient low mass transformer to do the step down into a low voltage high frequency current. This is then converted into low voltage DC current. This is why these newer AC power adapters are so light, because they no longer need these big heavy transformers. These efficient SMPS power supplies were first used for computer power supplies, and now they are pretty standard circuitry for the multitude of small AC adapter bricks that we use for all our personal electronics.
Anyway, so far so good. The TV channels are all back again.
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Reviewed in the United States on October 8, 2022
Reviewed in the United States on March 1, 2021
