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The STM32 is the third ARM family by STMicroelectronics. It follows their earlier STR9 family based on the ARM9E core, and STR7 family based on the ARM7TDMI core. The STM32 is based on the ARM Cortex-M family of cores.

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Here's what I did, in a very similar situation. Not a tuner, but a digital effects pedal. Firstly I'd personally suggest using a 9v battery for the analog gain stage, because the output of the guitar …
answered Feb 26 '15 by Dave Branton