Appropriate AC adaptor for PC engine CoreGrafX Mini

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Hi guys. I hope this post finds all who read it well. I've seen all the posts on here about the USB and controller issues with all models of the PCE and TG16 mini and I've got a CoreGrafX mini coming from overseas soon. It will be very hard for me to get a replacement and I am worried about these problems. From what I understand it seems to be caused by either using an AC adaptor that either doesn't provide enough amperage(