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OH, so you're running the smoke unit directly on 18 volts?  No wonder the 27 ohm resistor seems a bit much, you're putting 12 watts into a 2 watt resistor!  If you changed to the 18 ohm one, that would be 18 watts, and talk about SMOKE!  Try putting a diode in series with the 27 ohm resistor, that's how TMCC works in command mode, the smoke triac outputs half-wave power.

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