Guru
Joined: 05/03/2018
Location: NetherlandsPosts: 6101
| Posted: 06:22pm 21 Dec 2023 |
Surprise...
The Aliexpress package arrived. I assembled a board, and blew up my first pico.
The LM1117T 3.3 are fakes. When correctly connected (the PCB=okay) they output 4.6V at 4.7V in.
I cut the 3V3 enable jumper, and am running the second pico now from it's internal switchmode regulator.
The audio noise is not as bad as I expected.
The petscii game runs. Currently running chess over night to see if it remains running. I was expecting problems with the 2 dollar pico's from China running at 252MHz, so I had some genuine ones in reserve.
But this one seems to run fine. I may check 378MHz with an older firmware, just to see if there is any margin.
Volhout