# Emu Black internal switches

**URL:** <https://community.ecumaster.com/t/emu-black-internal-switches/3747>\
**Category:** EMU BLACK / CLASSIC\
**Created:** [May 21, 2025, 5:24pm UTC](https://community.ecumaster.com/t/emu-black-internal-switches/3747 "2025-05-21T17:24:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kaszlak\_tuner](https://avatars.discourse-cdn.com/v4/letter/k/dc4da7/32.png) [@kaszlak\_tuner](https://community.ecumaster.com/u/kaszlak_tuner)\
**Post date:** [May 21, 2025, 5:24pm UTC](https://community.ecumaster.com/t/emu-black-internal-switches/3747/1 "2025-05-21T17:24:24Z")

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Are switch inputs in Black some kind joined(like mux switch option)?  
If I’m using “free float” button to switch inputs, there is no problem.  
But if I want to use grounding signal from AC unit(which isn’t free float, probably pulled up to ~5V), other switches tend occasionally change their state, when AC request is changing.

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<div class="post-metadata">

**Author:** ![FloorItGarage](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/flooritgarage/32/61_2.png) [@FloorItGarage](https://community.ecumaster.com/u/FloorItGarage)\
**Post date:** [May 22, 2025, 3:42am UTC](https://community.ecumaster.com/t/emu-black-internal-switches/3747/2 "2025-05-22T03:42:43Z")

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I believe they are joined to the same 5V pullup internally.

Can you post a log with this occurirng? there’s a log channel for the “switch input 5V” or similar wording that may be of interest. Got me curious as I haven’t run into this even when using A/C request from a unit with a pull up.