Electronics > Beginners

Generating 3 voltage rails, will this work ?

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BravoV:

--- Quote from: David Hess on June 30, 2018, 09:08:45 am ---That is a fine way to do it if you can find an economical isolated converter.  But beware that the line regulation of linear regulators decreases at higher frequencies so do not count on them being able to remove switching noise from their inputs; additional LC filtering may be necessary.

--- End quote ---

David, yeah, I've been thinking about the quite line at analog power rails too, as above circuit, where that LC filtering parts should be placed ideally ?

Around C1 at input and C6 at output ?

BravoV:
Just arrived, the DC converter.

David Hess:

--- Quote from: BravoV on June 30, 2018, 10:27:59 am ---
--- Quote from: David Hess on June 30, 2018, 09:08:45 am ---That is a fine way to do it if you can find an economical isolated converter.  But beware that the line regulation of linear regulators decreases at higher frequencies so do not count on them being able to remove switching noise from their inputs; additional LC filtering may be necessary.
--- End quote ---

David, yeah, I've been thinking about the quite line at analog power rails too, as above circuit, where that LC filtering parts should be placed ideally ?

Around C1 at input and C6 at output?
--- End quote ---

I would start with an LCR decoupling network at the input to the switching voltage regulator to isolated it from the inputs to the linear regulators.

BravoV:

--- Quote from: David Hess on July 01, 2018, 04:38:02 pm ---I would start with an LCR decoupling network at the input to the switching voltage regulator to isolated it from the inputs to the linear regulators.

--- End quote ---

Something like this ? Added L4 ?

You mentioned LCR .. where the R part should be placed ?

Also L6 to reduce the output switching noise.

bd139:
Ideal world: Meanwell RT-65C + pi network LC filters on the +15V, -15V outputs.

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