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.
Carl
![puffer- schematic puffer- schematic](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/81678117756058474/filePointer/81678117759792085/fodoid/81678117759792079/imageType/MEDIUM/inlineImage/true/puffer-%2520schematic.jpg)
![puffer1 puffer1](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/81678117756058474/filePointer/81678117759792086/fodoid/81678117759792080/imageType/MEDIUM/inlineImage/true/puffer1.jpg)
![puffer-board-AC-Reg2 puffer-board-AC-Reg2](https://ogrforum.ogaugerr.com/fileSendAction/fcType/0/fcOid/81678117756058474/filePointer/81678117759792087/fodoid/81678117759792081/imageType/MEDIUM/inlineImage/true/puffer-board-AC-Reg2.jpg)