My spare SR98 is rated for 3A at 5v, so I did try it with 3A on the bench PSU, but never saw much over 1.5A, so I set it to that initially, but it was hitting the limit with Brett's machine, so I upped it slightly.exxos wrote: ↑Fri Jan 28, 2022 11:29 am Just a thought.. When you say your limiting the amps, do you mean you have the psu set to limit at say 2.5amps, or have you limited the amps the STE is trying to pull ?
It is dependent on voltage and other things, but a machine doesn't always pull the same amount as another. So if the machine is trying to pull 2 Amps, and your limiting to 1.8amps, then it will add to your troubles.
I currently (!!) have current limiting on the bench PSU set to 1.6A @ 5v. It does work for my own STE, which peaks at about 1.3A and Brett's is 1.5A
Testing his CPU in my STE, you could see it pulling more, so the extra is definitely his CPU compared to mine.
Bottom line is I changed this pretty early on to take account of the bench PSU hitting my limit and potentially causing problem with Brett's machine. It's no longer hitting the limit any more.
I don't want to work on a machine directly connected to the mains, with mains voltage on the heatsinks, plus I wanted to limit the max current in case of a short, Hence the bench PSU.