Reply to "I didn't know it could do that!!!"

stan2004OGR Forum Member

Did you rule out the chuffing-in-idle scenario (the one solved with a tach resistor)?

I suppose you would have said if you put the scope on the tach signal but to your point in the other thread perhaps something is modulating/pulsing the 5V power supply which ripples into false tach pulses. If the PS board has a direction-relay I believe those are powered from 5V and you mentioned this started when you "cycled direction" which I assumed meant you put it in reverse. Likewise I believe the smoke fan motor PWM is sourced from 5V - so for example if you turn OFF the smoke did the audio still chuff with no motion?

10/17/2012:03 PM

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