# 5.5V output?

**URL:** <https://forum.qoitech.com/t/5-5v-output/253>\
**Category:** Support\
**Created:** [January 11, 2019, 1:09pm UTC](https://forum.qoitech.com/t/5-5v-output/253 "2019-01-11T13:09:09Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![derchris](https://avatars.discourse-cdn.com/v4/letter/d/e0b2c6/32.png) [@derchris](https://forum.qoitech.com/u/derchris)\
**Post date:** [January 11, 2019, 1:09pm UTC](https://forum.qoitech.com/t/5-5v-output/253/1 "2019-01-11T13:09:09Z")

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Hi, I think I remember that the possible output voltage with external power supply used to be higher then 5V - am I wrong? Or did it change, indeed?

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**Author:** ![chrfle](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/chrfle/32/288_2.png) [@chrfle](https://forum.qoitech.com/u/chrfle)\
**Post date:** [January 11, 2019, 1:19pm UTC](https://forum.qoitech.com/t/5-5v-output/253/2 "2019-01-11T13:19:39Z")

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Maximum output has never been more than 5V.

What voltage do you need?

There’s a possibility of connecting a power supply in series with the Arc. When doing this the current will be measured correctly, but possibly with some additional noise. The energy will however not be correct as Otii will not be aware of the extra voltage fed on the side.

If this is something you are interested in we can provide some additional information.

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**Author:** ![derchris](https://avatars.discourse-cdn.com/v4/letter/d/e0b2c6/32.png) [@derchris](https://forum.qoitech.com/u/derchris)\
**Post date:** [January 11, 2019, 1:21pm UTC](https://forum.qoitech.com/t/5-5v-output/253/3 "2019-01-11T13:21:53Z")

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nono, I was really just wondering 🙂 It’s fine!

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**Author:** ![gerardus](https://avatars.discourse-cdn.com/v4/letter/g/a8b319/32.png) [@gerardus](https://forum.qoitech.com/u/gerardus)\
**Post date:** [February 20, 2019, 10:25am UTC](https://forum.qoitech.com/t/5-5v-output/253/4 "2019-02-20T10:25:45Z")

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Is there a software compensation possible if we add a external supply?  
Note: I used this in the past with a potentiostat and by using a (low impedance) battery is series there is no additional noise.

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**Author:** ![bjorn.rosqvist](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/bjorn.rosqvist/32/238_2.png) [@bjorn.rosqvist](https://forum.qoitech.com/u/bjorn.rosqvist)\
**Post date:** [February 20, 2019, 11:36am UTC](https://forum.qoitech.com/t/5-5v-output/253/5 "2019-02-20T11:36:46Z")

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Hi,

No, we do not have a SW that compensates for power supplies in series with Otii.  
This is, however, in our backlog.

Best regards,  
Björn