I need to build a circuit that counts down from 30 seconds to 0 once a button is pushed with a two-digit countdown display using seven-segment LED displays. Using 74192 counters and a button that when pushed stops the buzzing and the countdown resets to 30. I’m having trouble getting the LED to display starting from 30 and i’m unsure of what presets to have for the 74192 counters.

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