The engine has a 2 lobe cam and micro switch to create the chuff sound. It also has a puffer unit for smoke. There are various ways to change the chuff rate to 4 chuffs per rev. Most here use GRJ’s chuff switch which senses and counts lines on the flywheel. A few of us swap out the 2 lobe cam for a 4 lobe. A third option is to paint white lines on the back of a driver and use a optical reflector to create the 4 pulses per rev.
These signals can the be coupled to a fan smoke unit with additional circuitry.
This is mine with cam replacement and fan smoke unit.
This in an example of a photo detector.
And the result.
So you have choices.
Pete
