Capacitance multiplier from Zen variation 3

[kacernator]

Hi,

is the schematics for the negative rail allright? Isn´t the IRFP9240 mosfet drawn wrong? Shouldn´t it be that Drain is input and Source is output?

Thanks.

 

[Nelson Pass]

You are so right.

 

[kacernator]

IRFP250

I have some IRFP250 which I could use instead of IRFP240. But is it wise to use 250 together with 9240 in bipolar regulated supply as 250 will have lower output impedance than 9240? Is this "imbalance" problem?

Thanks.

 

[Zen Mod]

just go for it

 

[Skorpio]

Isn't Q2 turned upside down? Source must go to -25V...

 

[kacernator]

Isn't Q2 turned upside down? Source must go to -25V...

Yes, just read the first post. Dont only look at pictures .

 

[kacernator]

Cross-talk?

Hi,

I am using mosfet capacitance mulitplier in PSU for a tube preamp. I have 220uF-mosfet-470uF-both channels. Is there a problem sharing one cap multiplier for both channels together? Have I increased cross talk this way?

Thanks.

 

[Zen Mod]

depends of wiring layout and sort of load/final stage

 

[kacernator]

Each wire connecting each channel is taken from one point, like "Y" shape, where the shared point is output from cap multiplier. Load is cca 25mA.

 

[Zen Mod]

good enough

 

[Dzius]

Is it a good idea to use TL431 for triming the output voltage like below ?