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I am by NO means an electronics guy, so I'm looking here for ideas to power LEDs that we will be placing on our layout.  I know the difference between wiring things in series vs. parallel but I don't feel these circuits in my bones the way some of the EEs on the list do...

The LEDs on our layout will largely be strung along a bridge we're building.  There will be about 100 on the bridge (which is similar to the prototype we're modeling).  We will also be powering LEDs like the one on the O Scale figure who smokes a cigar with a lit LED on the end of the cigar, as well as a others that come up as we think of them.  In other words, unlike LEDs used in passenger cars, ours don't need any fancy constant-lighting circuits or anything like that.

My question is: Assuming the voltages/amps are similar, is it a viable option to simply hook these up to a DC transformer, set the voltage to the range needed by the LED, turn the transformer on, and be done with it?  Or are there other circuits that are supposed to feed into the LEDs?  One transformer I'm thinking about is shown below:

I really know very little about this so any and all suggestions, advice, guidance, etc. are most welcome.

Thanks in advance for your help.

Steven J. Serenska

Last edited by Serenska
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These are going to be individual LEDs, not a string.  To perhaps expand the discussion, here is a night photo of the bridge we'll be modeling:

The LEDs will represent 1) the lights you see along the main cables, 2) the two blinking red LEDs on the top of the towers, plus 3) an equal number of ones that are in lampposts along the roadway.  The photo above was taken at dusk and apparently only a few of the ones on the roadway have come on.

The aren't illuminated here, but this photo has a better view of the lamps along the roadway that we'll also be representing with LEDs:

Due to the needs of the model, I think it would be a miracle for us to find strings of these with a bulb count and spacing that were exactly what we need.

Thanks again for your help.

SJS

Last edited by Serenska

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