I am new to this forum. It looks very informative.
I have a question about a 555. I am trying to make a countdown timer that starts when power is applied and sets off a piezeo buzzer after a duration of about 10 minutes. I have tried different thing circuits I found on the web but none of them really do what I need. Some require start up switches, etc. I just want it to start timing when power is applied.
Could someone refer me to a page or post a circuit that would do that please? I would appreciate it.
I have a question about a 555. I am trying to make a countdown timer that starts when power is applied and sets off a piezeo buzzer after a duration of about 10 minutes. I have tried different thing circuits I found on the web but none of them really do what I need. Some require start up switches, etc. I just want it to start timing when power is applied.
Could someone refer me to a page or post a circuit that would do that please? I would appreciate it.