On Sunday, 26 July 2020 11:54:27 CEST Luke Kenneth Casson Leighton wrote:
you *need* a stable supply to do that (1.5 preferably 2.0 A) designed *specifically* for providing USB power. UNDER NO CIRCUMSTANCES plug the 12v PSU into the USB socket. and DO NOT use an "off-the-shelf generic 5.0v wall wart". use something SPECIFICALLY designed for providing USB power because it is (a) stable and (b) current-limited.
All this talk of regulated power supplies reminded me of this product which takes a range of inputs via the barrel jack socket:
https://proto-pic.co.uk/product/sparkfun-prt-13032-breadboard-power-supply-s...
Meanwhile, the CI20 can be powered from a USB port and employs a barrel jack socket to accept that power. According to the hardware reference it is actually "a 5V 4mm (shield) x 1.7mm (pin) center positive connector ... identical to that of the original Sony PSP":
https://www.elinux.org/CI20_Hardware#Power
I'm not sure if either of these things are relevant here, though.
Paul