Tuesday, April 8, 2014

Lighthouse lantern

I needed to build a half dozen lighthouses. The lantern (the part where the revolving light and Fresnel lens is located) is the tricky part. All the lights had to work and look realistic. 
I found a custom circuit that would allow an LED to pulse on and pulse off with a 3 second gap between the pulses. The circuit operated on between 9 and 20 V AC or DC - perfect for the auxiliary side of many train power supplies.

To hide the bright LED I used a piece of clear plastic rod. I drilled out a hole for the LED to fit in, and roughed-up the outer surface with fine sandpaper to diffuse the light. It works and looks nice.

BTW - I'm holding the top of the lighthouse with a paper cup - the wires can hang down through a hole punched in the top of the cup. 

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