# Notecarrier AF V+ pin?

**URL:** <https://discuss.blues.com/t/notecarrier-af-v-pin/791>\
**Category:** Notecarrier F\
**Created:** [April 25, 2022, 10:28pm UTC](https://discuss.blues.com/t/notecarrier-af-v-pin/791 "2022-04-25T22:28:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dirtdevil](https://avatars.discourse-cdn.com/v4/letter/d/edb3f5/32.png) [@dirtdevil](https://discuss.blues.com/u/dirtdevil)\
**Post date:** [April 25, 2022, 10:28pm UTC](https://discuss.blues.com/t/notecarrier-af-v-pin/791/1 "2022-04-25T22:28:13Z")

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The documentation for the Notecarrier AF says that it is safe to power the Notecarrier by “applying 2.5 - 5.5 VDC to the `V+` pin.\*” None of the breakout pins are labeled `V+`.

The V1.7 schematic has this:

 ![image](https://us1.discourse-cdn.com/flex020/uploads/blues/original/1X/a07c06c88ef6624aa0a476e07160ab774c115d3a.png)

Which implies that the pin labeled `<VMAIN` is `V+`. However, this is in contradiction to the datasheet that states `<VMAIN` is an output pin.

When I measure the voltage between `<VMAIN` and `GND` (while connected to USB power) I measure 5V. If the schematic is correct, I think I should measure 0V because of the diode. Perhaps I’m missing something obvious, but it appear there is no exposed V+ pin.

Basically, if my goal is to provide power from a 5VDC power source, some other forums indicate supplying the DC via the solar port (instead of using a solar panel). Is that an approved mode of operation? If not, where is the appropriate location to source 5V DC to the Notecarrier?

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**Author:** ![dirtdevil](https://avatars.discourse-cdn.com/v4/letter/d/edb3f5/32.png) [@dirtdevil](https://discuss.blues.com/u/dirtdevil)\
**Post date:** [May 5, 2022, 12:39am UTC](https://discuss.blues.com/t/notecarrier-af-v-pin/791/2 "2022-05-05T00:39:50Z")

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At least on all my boards Notecarrier AF 1.7 boards, DS2 is not populated with a diode, instead it is populated with two zero ohm resistors.

 ![image](https://us1.discourse-cdn.com/flex020/uploads/blues/original/1X/9106ed3c7cafbb12d82b811aefde3cf73c034a7d.jpeg)

So the answer is, PIN 12 on J9 is both V+ and VMAIN.