OK here is the Idea: Contact switch is engaged for desired time ( changeable from 5-30 min in 5 min increments) then a pleasant chime sounds. If contact switch is released prior to desired set time then unpleasant buzzer time sounds and resets to start over.
I have been looking at some 555/556 circuits but wonder if there isn't something out there already doing this in some form that I could adapt. Thanks in advance for any advice.
I have been looking at some 555/556 circuits but wonder if there isn't something out there already doing this in some form that I could adapt. Thanks in advance for any advice.