Is one permitted to set an alarm clock before shabbos to go off on shabbos?
The problem is hashmoas kol and how will you turn it off?
“The problem is hashmoas kol”
– *A* problem is hashoas Kol but I doubt it can be heard outside. Another problem may be the Rav Moshe peak on using timers on Shabbos
“And how will you turn it off?”
– it used to be that almost all alarm clocks turn off after a minute. They still sell them.