That's about the opposite of what you want to do. Applying 8.75 V to a dead cold filament will cause a lot of current to run in the filament, thus, causing a thermal chock. That's not nice...
I wonder if it has to do with the fact that you have two control loops in your circuit. One that controls the voltage across the filament, the other controls the current. I would eliminate the voltage control loop and just program the current to 1.4 A. You could make it adjustable so that you can adjust for 5.0 V across a hot filament.
~Tom
I wonder if it has to do with the fact that you have two control loops in your circuit. One that controls the voltage across the filament, the other controls the current. I would eliminate the voltage control loop and just program the current to 1.4 A. You could make it adjustable so that you can adjust for 5.0 V across a hot filament.
~Tom
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