Proffesional Digital Power Supply 4 Lab projects

[fadyfawzey]

Hi all,

I looking 4 building a very stable & professional digital power supply that have the following basic requirements:

-Dual output voltage (i don't have CT transformer).
-Have 3 to 4 varying ranges (One dual , other are positive only)
-Output voltage vary from -24 : 0 : 24 (-ve voltage for dual channel only)
-At lest provide 6A output current at all loads.
-Have a digital 2x16 LCD to provide the output voltage & Current measurments that are calculated via AVR Microcontroller (Note: i may require selector switch here to select between 3-4 output channels).
-all the output voltage & current are adjustable.
-(optional) instead of using pot resistor to adjust the voltage & current , can i make it digitally adjusted through the microcontroller using tack switch or something similar
-Also i hope to provide a all output channels with overcurrent / over voltage / short circuit protection

In my country i only have transformer with 240:24(3A) , no CT Transformer (So how many transformers that i need , and how to connect them properly )

I know that power supply will be be large and have a very complex circuit & will cost me lot & need large box ..

I need some schematics , ideas that can help me building this dream .. Also can i build all of that in Plastic box (I don't have any ready steel box with proper size to hold all of that ).

Waiting all of u ..

[fadyfawzey]

Any Ideas or Help Please ..

[magnu]

Agilent has some old service manuals on their web site, including schematics, with adjustment instructions.
http://cp.literature.agilent.com/lit.../5950-5976.pdf

There are plenty more manuals, from where this came from.