I make my own for my S gauge locos.  This one here uses a 78L05 but I recommend a larger 1 amp 7805 regulator if using track voltage for the source instead of a smoke feature out of a TMCC board..

It has a resettable one shot timer so at faster speeds you get constant smoke and not a choppy pulse .

Also R-1 is optional if you want the fan to run at a constant slow speed at idle.
Remove if you don't want that feature.  

Costs about $5  in parts.  It can be made on a piece of vector PC board.


puffer- schematicpuffer1puffer-board-AC-Reg2



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