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Hello Brian , This advice made the Vgs work like a magic.

I want to understand the physics behind it.

before adding the zenner diode and resistor, there is a section below where the gate is 12V higher then the source.

When we connect the zenner 1N750  between gate and source  then D3 is reversed biased with 4.7V on Vgs.

why do we need to resistor? it seems the zenner is doing all the job?

did you mean to put a resitor in series with the zenner?

Thanks.

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