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What's the function of the timer's output buffer?

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    – SamGibson
    Dec 31, 2021 at 17:38

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As internal signals are only strong enough to drive the internal circuitry connected to them, the buffer provides strong output current drive ability for driving external circuitry.

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The function is the typical output used from the 555. It can sink or source up to 100 or 200mA to drive LEDs, perhaps a relay etc. See the datasheet

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I googled and found these. That may help you.

The 555 timer IC can be used as an inverting buffer as well.

https://sound-au.com/articles/555-timer.htm

https://electronicsclub.info/555buffer.htm

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