555 Astable Calculations

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555 Astable calculations. Worked examples of how to calculate T, R and C.
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There is a way of calculating the frequency of an astable circuit using a chart called a nomograph and cannot find any explanation of how to do this and would love to see a video with a step by step explanation of how to use this chart.

cosmos
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hey bro how can i set the duty cycle 50 percent

andumokonen
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hi, how to calculate 555 timer blinking rate that just using one resistor Rb only?

tupai
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how to calculate Ra and Rb when you have duty cycle, frequency and C

Daniel-Lin-