# 28 Pin AVR Development Board

**URL:** <https://community.sparkfun.com/t/28-pin-avr-development-board/13770>\
**Category:** MicroMod\
**Tags:** avr-atmel\
**Created:** [December 27, 2009, 10:31pm UTC](https://community.sparkfun.com/t/28-pin-avr-development-board/13770 "2009-12-27T22:31:31Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rukus](https://avatars.discourse-cdn.com/v4/letter/r/db5fbb/32.png) [@Rukus](https://community.sparkfun.com/u/Rukus)\
**Post date:** [December 27, 2009, 10:31pm UTC](https://community.sparkfun.com/t/28-pin-avr-development-board/13770/1 "2009-12-27T22:31:31Z")

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I have a question regarding the 28 Pin AVR Development Board

sku: DEV-00029.

I noticed in the Development Board page it says -

**Selectable +3.3V / +5V power supply voltage regulator**

When I look at the documentation, I don’t see a callout for a jumper to do the voltage selection in the .pdf file, but the schematic it shows a jumper but its not named.

Anyone know how thats done?