Hello, I'm looking at Digikey's website to purchase the various Triac's for my Lionel R2LC-C08 radio boards, including the one for the smoke unit. I would like to repair my old boards. Two of the triac's were listed as obsolete on Digikey's website, and some have the same number as the triacs on my old boards, but Digikey's webite will show extra letters at the end of the replacement triac numbers. I don't know where to go from there. Also, there's one near the two can capacitors with markings LM78L05, what is the purpose of this particular triac? Thanks, Mike
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