yashiharu:
omg! program fail might happen ...
Yep there aren't that many but there are some situations where software can damage/destroy hardware.
may i know which kind of PSU you recommended with fuse?
I can't really recommend anything specific. For general benchtop use I have a repurposed PC power supply. To 'install'
something more permanently I have dozens of random generic wallwarts picked up over the years. But I don't commonly deal with higher power >2A projects so don't know what's best to pick. Yes a built-in fuse would be very nice or better yet a circuit breaker but that's a few $ more.
If I needed something I'd browse through ebay and look for a long-time reputable vendor. PS are THE most common electronic product in the WORLD. (Second is amplifiers.) There have to be -thousands- of PS vendors out there handling at least hundreds of manufacturers. Which means there can be a lot of garbage as well as quality stuff.