I have an Adaptec USB card model AUA-1420A for my laptop computer. The card
has a plug for an external power source. The documentation says it needs a 5
volt DC, 1.5 amp output with a P-7 connector (3.5-mm outside and 1.3-mm
inside diameter) positive center.

Searching the internet I can't find a source. Does anyone here know of a
retail source? I probably have over 20 external power supplies in my junk
pile, but nothing will work.

Pat Harman