If you look on the Mistic River forums, you'll find dozens of examples of people who have killed their players in precisely this fashion. Though it's too late to help you, in the interest of possibly preventing others from making the same mistake, it's a BAD idea to use universal changers with the H100 and H300 series. For the H300 series, the Sony PSP has precisely the same specs, so if you need a replacement charger, get one that is designed for the PSP.