Thanks all of you experts for your expertise. I am learning about electronic / electrical things from you all.
I bought an assortment of 0.25 watt carbon film resistors with 5% tolerance in the range of 10 to 1K ohms on the bay last night, so I can learn by doing on a breadboard and then take what works to my layout.
My layout needs lighting, and it annoys me that I have a mix of things with incandescent bulbs and LEDs that have differing power needs. My goal is to have a common 10 to 12 volts to all of the lighting circuits on my layout. To minimize the number of lighting transformers, I intend to use LEDs to the maximum extent possible.
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