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Fan Power Source

Posted: Mon Aug 13, 2018 12:18 am
by ve2ngq
I Am new to Raspberry and I never used a forum before,
I bought a 3.3V/5V fan. for my B+ I am looking for a power source OTHER that the GPIO pins as I need them for my 40pin cable assembly to my breadboard.
Is there a secondary source?
Thanks in advance
Nat

Re: Fan Power Source

Posted: Mon Aug 13, 2018 1:27 pm
by hippy
ve2ngq wrote:
Mon Aug 13, 2018 12:18 am
I am looking for a power source OTHER that the GPIO pins as I need them for my 40pin cable assembly to my breadboard.
You could run wires back from the power points on the breadboard for your fan, or use another mains PSU wallwart for supplying the fan's power, which might be the best recommendation anyway.

If you use pin headers on the wires supplying the power from breadboard or PSU you can unplug the fan from those and connect directly to GPIO when the breadboard is not being used.

Note that there's not usually no need to use a fan with a Pi anyway, so perhaps just don't use one, or not when using the breadboard.

Re: Fan Power Source

Posted: Tue Aug 14, 2018 12:02 am
by mosespi
You can also power it from the USB-A connectors. Bonus in that on some RPIs it's protected at 1.2A (total for all ports) and you may be able to turn it on and off from software.

Regards,
-Moses