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Reply to "Seeking a suitable smoke unit for a broken down vehicle"

I'd go with the fan-driven PS1 unit if you can find one.  As noted above you can run it on 12V DC which of course is what you'll probably use for one of those eBay ~$5 timer modules that can be programmed to cycle 30 sec (or whatever) ON and 5 minutes (or whatever) OFF.  If you can only find a PS2/3 unit with separate fan and heater drive, you can use eBay $1 DC-to-DC voltage regulator modules to efficiently drop the 12V DC to the heater-resistor and fan-motor voltages.

Sounds like a fun project!  And speaking of "sounds", if you have figures standing about, why not have the timer also turn on a DC-powered sound module (eBay ~$5 in parts) with the hissing sound of a leaking radiator and dialog.

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