# 3.3V reference

**URL:** <https://community.sparkfun.com/t/3-3v-reference/11341>\
**Category:** SparkFun Site Questions/Comments\
**Created:** [May 28, 2009, 1:32pm UTC](https://community.sparkfun.com/t/3-3v-reference/11341 "2009-05-28T13:32:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Steffen595](https://avatars.discourse-cdn.com/v4/letter/s/cab0a1/32.png) [@Steffen595](https://community.sparkfun.com/u/Steffen595)\
**Post date:** [May 28, 2009, 1:32pm UTC](https://community.sparkfun.com/t/3-3v-reference/11341/1 "2009-05-28T13:32:39Z")

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Me again.

Bought a small 9 V power supply, connected it to the sensors. The logomatic gets its voltage through a 5V regulator. Now the measurments are more stable, but still 35mV / 3.5 centigrade off. Seems the 3.3V voltage is a bit whacky. Can I supply the 3.3V externally? Shall I crank it up to 6V?