Triple Digital power supply Voltage display on one LCD display

[Arrow]

If you don't need super high accuracy, I've used this Linear opto configuration many times.
Saves having to put a micro on every PS stage. There are a few types of optos around, just check specs.

Great schematic, I will take a look!! Thanks!!

[Harvs]

So you're building a switching pre-regulator.  Are you building a triple off-line isolated switching supply with independent isolated channels?  That's not exactly straight forward!

Why not?? please explain.

Maybe you design off-line switchers for a living or something, I don't.  Having read a few of Keith Billings' texts on switching supplies while making some car amp psu's, I just understand there's a whole pile of stuff to consider with respect to safety isolation and how the transformers need to be wound etc so you don't kill anyone.  Hey maybe I'm over thinking it, maybe there's some straightforward recipes for designing off-line switchers, I've just never tried it.

If you were willing to post some schematics, PCB layouts and transformer design info that'd be really nice to look at.

[Arrow]

You are completely right. But in the past I has design some small switching power supply with the uc3842 /TL431 and other controllers. But the switching PS ( 1st stage) I am working on right now is not my design, I bought them some years ago. They gave fixed 50V.  But I  tear them apart like Dave said and hack the schematic so now I can control the voltage from 8 to 58V, just what I needed. It is the linear part that I'm going to design. I'm doing this just for fun and to test my electronic skills with DAC and ADC and constant voltage on regulator controller ect.  I already have a power supply the BK9130. works good or better very good!!