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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.
@Gordon
Wow, sorry to hear that - usually those JST connectors have a key in them? Glad nothing else was damaged though!
But yes, it's the 3.3v SOT23 MCP1703T - I believe MCP1703T-3302E-CB
It should be reasonably easy to get hold of - here's a mouser link: https://www.mouser.co.uk/ProductDetail/Microchip-Technology/MCP1703T-3302E-CB
But depending where you are you might have a bunch of postage :)