Average Reviews:
(More customer reviews)This very poorly calibrated piece of "MADE IN CHINA" junk permanently DESTROYED my laptop computer's USB port.
I plug my small portable audio cassette tape player with its USB connection into my laptop computer, as a music audio source. My tape player is powered by the computer's USB port when the tape player's two AA batteries are not installed, or a 3-volt, 500mA AC/DC power adapter (which "Cool Components PS-500" is SUPPOSED to be) can also be used to power the tape player.
I have been successfully playing my tape player through my computer's USB port for several weeks, but the FIRST TIME that my tape player used THIS "Cool Components PS-500" for power (on its 3-volt setting), the computer immediately displayed a "POWER OVERLOAD" warning pop-up window and the USB port instantly died (the computer manufacturer's Tech Repair Help Line tried to fix or reset the USB port, but it would not reset -- the tech rep said the USB port is permanently destroyed).
So then I wondered what went wrong, so I tested all of the "Cool Components PS-500" voltage settings with a voltage meter to see why it happened, and the meter showed the following: "Cool Components PS-500" settings: 3 volts (actual is 5.6 volts = almost double the prescribed voltage -- the excess (double) power ran THROUGH my tape player's circuit INTO my laptop's USB port and FRIED the computer's USB port).
"Cool Components PS-500" other settings: 4.5 volts (actual is 8 volts). 6 volts (actual is 10 volts). 7.5 volts (actual is 10 volts). 9 volts (actual is 14 volts). 12 volts (actual is 19 volts).
Adding insult to injury, after permanently ruining my laptop computer, Seller [...] wants me to pay the return postage to get refund, AND write a separate letter to them requesting a refund AFTER I return the junk to them at MY expense. Absolute DISGRACE !!! WARNING !!! AVOID BOTH !!!
Click Here to see more reviews about: Cool Components PS-500 Universal Transformer 3V-12V 500mA
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