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Hello, Please ask a question about NE555 Datasheet

# Example questions: ➢ What is the primary reason the trigger signal must return to a voltage greater than one-third of the supply voltage before the timing cycle completes?
➢ What value of total resistance is permissible for the combination of ra and rb when operating the timer at 15v, and what value is permissible when operating at 5v?
➢ How do these times affect the output signal, and what is the key difference in what causes each delay?