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Reply to "Another LED constant lighting question for passenger cars . . ."

Hi all - I did this conversion to my Polar Express but something seems amiss (don't want to hijack the thread): I don't have constant brightness (it still varies with power applied), and now there are tiny sparks/crackling where the wheels meet the rails when it rolls.  There's a very small hum too, changing pitch depending on power applied and whether or not the light strip is attached to the Buck (no strip = no hum).

I used these components:  Buck Converter,  Light string (3528)Bridge Rectifier, 220uf capacitor.  Piece of cake to solder up.  I removed both bulb sockets in there and ran the incoming power wires to one "~" of the bridge and the incoming black wires to the other "~".   "+" and "-" out to the Buck.  The power wires have a stripe on them (at least one does) and initially attached to the red wires of both sockets, opposite for the black wires.

The light string for the car lights up so I know the AC-DC conversion is happening.  Could something be improperly grounded or crossed (I don't see how, but...)?  Are my components wrong?  What should I check?

Thanks much

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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