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You told us the alarm sounds for 1hr (not 30mins). My circuit was designed accordingly. With the component values shown the minimum timer period is ~1.5hrs, as I mentioned in post #43. That means the timer is started (reset) by the first pulse in the beep and stops after a minimum of ~1.5hrs.alarm clock beeps for 30 minutes .... and I have set the R4 to 1 hour timing...