555 Timer: An astable 555 timer has R1 = 75 kohms, R2 = 30 kohms, C = 47 nF, and VCC = 12 V. What does the output look like? What is its frequency?

Answer: The output is a rectangular wave with a width W = 3.42 ms and a period of 4.4 ms. The frequency is 227 kHz.

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