Electronics > Projects, Designs, and Technical Stuff
Tripple limited bench PSU ( digital ) from wall adapter
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Jan Audio:
Hi, i made this topic in search of a cheap tripple bench PSU :
https://www.eevblog.com/forum/testgear/3-channel-psu-without-problems/
I got the suggestion to build something to save money ( page 3 ).

I,m not doing any 220volt ( i have my reasons ), so i like to use a wall adapter as power source for this adjustable PSU.
Here are the specefications i like to build :

0 to 15 volt output on 2 channels
0 to 5 volt output on 1 channel
Current limited
Accurate measuring ( per 1 milliamp )
Digital control
Wall adapter input

So it can be really simple with 20x4 display and a few rotary encoders.
So how does all this works ?, what parts do i need per section.
Will there be expensive parts ?

Programming the LCD is no problem.

Can it be done without earthing ?
A wall adapter has no earth, i like to make -15 volt and +15 volt.

thanks
Cliff Matthews:
I posted with a 1ma spec panel meter, but after realized there's more you'll need to know:
 
A) You want to avoid mains, so it's going to be messy (and off-the shelf SMPS's often supply dirty power)
B) The 2 or 3 wall adapters you'll need are missing a maximum current spec (for still unknown expectations)
C) Wall adapters will require galvanic output isolation from the mains (for all to function as a cohesive whole)
D) You'll need to read other project posts regarding bench supplies with good Vref, DAC's and digital control.
not1xor1:
as a non-native English speaker I was wondering what the heck does TRIPPLE means... when I realized it was just a misspelling matter  :D
Jan Audio:
I dont like the idea of 3 wall adapters.
I want all from 1.
Cliff Matthews:
Today's wall adapters rarely have 2 outputs, still fewer are isolated from both the mains and one another. and you want 3?

FWIW, source power complexity is only where the fun begins.. digital control and measurement of all 3 supplies at your specified 1ma resolution is tricky. There's lots of projects on the forum.. spend time reading and asking questions. Good luck!
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