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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
d0773d
A bypass cap goes between supply and ground, right next to the device in question.
Sometimes people also put a small cap between an analog input and ground, to smooth out noise; this isn't appropriate for all sources of analog input, though.
Finally - you realize there will always be jitter of at least 1/4096, as it's a 12-bit dac, right?