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 Posted - December 24 2014 : 11:29:01 PM
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I was wondering how I could make or what to do to make a reverse light for an HO scale Mantua engine? Using grain of wheat bulbs for the project. I want it to turn on when I throw the engine in reverse and have the front light turn off.
" Heck with counting 'em rivets, TRAINS ARE FOR FUN! Not called the Mad Scientist for nothing either!"
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Posts: 3147 ~
Member Since: May 07 2007 ~
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Posted - December 25 2014 : 12:33:41 AM
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What you will need is fairly simple. Insert a diode between each bulb and power, one wired Cathode end, the other bulb Anode end, to power. That way, each bulb will work one way only. Here's a link to a circuit which does that. You'll need 1N4001 diodes or equivalent.
http://www.awrr.com/ConstantLighting.html
You'll have a 50-50 chance of getting the direction of the front and rear lights, OR you know that the right side of the loco is + power, and the left is - going forward. Wire accordingly.
Jerry
" When life throws you bananas...it's easy to slip up"
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Country: USA ~
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