Richard Connell
Well Known Member
I have a question for the electronic experts and perhaps G3Xpert.
I have a DPST fuel pump switch which had an 240AC globe. I replaced it with an LED and an appropriate resistor and it works great.
One pole is the fuel pump (+) and the other pole is a discrete ground back to the GAD27 for the annunciation of “fuel pump”. That all works great too.
The LED illumination joins the poles in the on position.
I’d like to dim this LED if possible. If I had a 3PST switch that would probably be quite simple.
Is it possible to run the ground for the LED back to the PWM dim circuit and also have that PWM as a ground for the discrete? Or is that a hare brained crazy idea?
I figure that the discrete is going to “see” a ground still, just oscillating at whatever frequency/duty cycle the dim is commanding.
Thoughts?
I have a DPST fuel pump switch which had an 240AC globe. I replaced it with an LED and an appropriate resistor and it works great.
One pole is the fuel pump (+) and the other pole is a discrete ground back to the GAD27 for the annunciation of “fuel pump”. That all works great too.
The LED illumination joins the poles in the on position.
I’d like to dim this LED if possible. If I had a 3PST switch that would probably be quite simple.
Is it possible to run the ground for the LED back to the PWM dim circuit and also have that PWM as a ground for the discrete? Or is that a hare brained crazy idea?
I figure that the discrete is going to “see” a ground still, just oscillating at whatever frequency/duty cycle the dim is commanding.
Thoughts?