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Free function generator

This month's (January 2019) giveaway is a 10 MHz function generator - or, rather, a bag of parts that can be assembled to be a function generator. I bought this from eBay a couple of years ago and just haven't had time to put it together. It could be a great project to do with a young 'un. There is no plastic box, and I can only presume all of the components are included. Enter the contest here.

Spurious vector! Bad DMA transfer! A null pointer was dereferenced!

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