Plate voltage microphone without zener diodes.

[vmanj]

Greetings to all.
I want to remove the zener diodes from the power supply for plate voltage, and regulate the voltage without them.
Which option (in the image) 1 - shunt or 2 is preferable ?

 

[Khron]

But why?

 

[vmanj]

My power supply for DIY c-800g, with zener diodes, does not "pull out" 230V.
And without zener diodes, it turns out 240V.
I want to lower the voltage a bit..

 

[Khron]

Reduce the series resistor values? Increase the total zener voltage and move it "upstream"?

 

[vmanj]

I have already reduced them from 20K to 4.7K.
I also changed the divider for the polarization of the capsule to 470K and 100K plus a 100K potentiometer between them. To reduce power consumption..
After all this, I get 235-240V.
For normal operation of 230V zener diodes, this is not enough.

 

[Khron]

Well, since the current requirement is tiny, why not go with a voltage doubler? That should leave you plenty of headroom to regulate down to 230v.

Mind you, that'll probably need 5-600V capacitors. But since you're looking for single-digit mA values, perhaps even some film caps might do, at least in the early stages.

 

[vmanj]

I have an extremely limited space for the power supply, so I can’t change anything globally in the circuit, and I don’t want to.
Is it possible to do without zener diodes?

It's easier for me to implement option 1 - to slightly reduce the value of the shunt resistor, but I ask for advice, which of these options is better?