After some research, I put together the attachment to document my understanding of setting the gain with pins 1 and 8 (but not pin 5) on the LM386. Because of my limited math skills, I created a spreadsheet to calculate the gain on any value resistor used in series with a 10 μF capacitor. My spreadsheet gives the (essentially) correct answer for no resistor as 201, and for a 1 MΩ resistor as 21, but it calculates the gain with a 1200 Ω resistor as 39.2, which contradicts the datasheet.
Is my formula wrong, or is the datasheet just an approximation?
Is my formula wrong, or is the datasheet just an approximation?
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