For powering my HAM radio stuff I needed some good portable AC Adapter 13.8V about 3 Amps. My adapter of choice was Lenovo 20V 3.25A (FRU: 42T5283, LENOVO P/N: 36200033) since I have 3 of them from my various older laptops, they are reliable, small and well I just had them in my shelf. Now how to convert them.
"After all, it is work that counts, not the applause that follows."
- Robert Falcon Scott