I'm trying to make this circuit work but having no luck. I'm using a anemometer for the input which gives 1 pulse per revolution. I'm trying to get the alarm to sound when reaching approximately 70 MPH. I'm not getting an alarm at any range on the speed adjust which is 26.6 - 82.8 MPH. I am also trying to find a way that once the alarm is sounded, it will stay on until it is reset. I would be thankful for someone's help on this circuit.
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