# STM32 Development

**URL:** <https://community.openenergymonitor.org/t/stm32-development/6815>\
**Category:** Hardware\
**Tags:** stm32, development\
**Created:** [12 March 2018 17:30 UTC](https://community.openenergymonitor.org/t/stm32-development/6815 "2018-03-12T17:30:28Z")\
**Posts on this page:** 1\
**Showing post:** 102

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**Author:** ![dBC](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/d/5f9b8f/32.png) [@dBC](https://community.openenergymonitor.org/u/dBC)\
**Post date:** [27 March 2018 08:49 UTC](https://community.openenergymonitor.org/t/stm32-development/6815/102 "2018-03-27T08:49:01Z")

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Those Irms values look very good… almost too good to be true. Do they ever change at all? I’m assuming that’s the mid-rail? I’m not quite sure what to make of Vrms but it looks pretty solid too.

I struggle with headphone jack schematics. Can someone advise what the expected behaviour is when nothing is plugged in please?

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