Can anyone please advise what is the best design approach for a circuit that will activate a buzzer at random time intervals?
There would need to be an adjustment as to how many times per hour the buzzer is triggereds, ie. 2-20 times. But the pattern itself must be unpredictable, and no two triggerings any closer together than 3 minutes.
Thank you for any info along these lines.
PS: Could this be done without a micro?