I use MTH smoke units in upgrades that I replace puffers or Seuthe smoke units with fan driven smoke. To simplify the installations, I have adopted a method where I can use the 16 ohm smoke resistor without replacing it. I isolate one of the two resistors, the one farthest from the output stack, and energize the resistor closest to the stack. The power dissipation of the 16 ohm resistor with the R2LC smoke output is a tad high, so I like to drop the power a bit. In order to have reasonable smoke and not have to fill it every lap, I use a couple of bridge rectifiers to drop the voltage about 2.7-3.0 volts from the TMCC R2LC output.
Since the Super-Chuffer has an output that indicates that we're stopped or running, I have built a little circuit on proto board a number of times that uses a 12V relay to switch in and out a couple more bridge rectifiers for when I'm stopped or moving. This gives me lower volume smoke when I'm not moving, and ramps it up for when I'm underway. I use the same scheme for diesels with my Locomotive Motion Detection circuit.
I'm getting a little tired of hand wiring the circuit every time I need it, so I'm looking at maybe speeding up the process. Here's the circuit I use, and I've done a trial board layout that uses it.
It's also possible to "tune" the smoke level by jumpering out one or more of the bridge rectifier positions if you want a bit more smoke or you don't like the balance of the idle to running smoke.
