Negative Positive
Title: SUP-USB USB Adapter
Review: Product: SUP-USB USB MP3 USB charger. AC to USB and 12V (car) to USB.The 12V (car) to USB did not work. Upon inspection, fuse contact was open circuit. Solder quality inside of unit is very poor. Has no output over voltage protection. if the internal 12V to USB (5V) fails, which could happen if the series switch transistor fails short or if the Vout feedback resistor opens or comes unsoldered, the MP3 player would get 12V and could be destroyed. I do not know if this a safty issue because I do not know if MP3 players have any charger input protection. My player uses a lithium battery and a lithium battery can be dangerous if not charged with in their ratings.My qualifications: Electrical Engineer, designed voltage regulators for over 30 years.
Is the review positive or negative? 