My try at Daves DC load? opinions

[ahnuts72]

Sure enough it was from the fan
unplugged it and straight to a flat line.

Thanks for all you guys help.

Gonna add some filtering try to get it
right and then maybe make a new board.

[ahnuts72]

Ok finally got around to building a filter for the fan noise now much better.

Ran it on the power supply at 1 amp for 30 min transistor and heat-sink
got warm but worked great.

Went to shut everything down and thought I would get a few pics.
First one is comparison of meter and display,second one is before
the filter third one is after.

[Spikee]

You could use an isolated low power dc dc converter for your fan (also isolate the pcb space).

[ahnuts72]

I've got rid of the noise on the supply rail and no oscillations so I think I'll leave it alone.

May make a new board with the filter on it instead of spliced into the feed for the fan.

Sent from my Nook HD