Lab power suply

[DrMikeCZ]

Hello everyone!
I want to build my own lab power suply, I already have toroid transformator (100VA, 24V). I want to somehow control voltage from 0,something to 20-24V and there is the problem.
I dont know what technique use.  I want to use maximum power of that transformer so about 4-5A so i can´t use linear regulators. I´ve done some research on di-gi key, but I haven´t found anything to do that job... can somebody help me? 

[diyaudio]

Build a HP E3620A based on the schematics. simplicity == beauty.

 http://user.engineering.uiowa.edu/~expeng/equipment/HP_E3620A_manual.pdf

[angelioto007]

Well, you can add several linear regs in paralel to achieve high currents...
btw Welcome to the EEVBlog comunity 

[void_error]

You can start here - it's a long read but it might give you a few ideas. Some things were tested, most of them were not.

[richard.cs]

Build a HP E3620A based on the schematics. simplicity == beauty.

 http://user.engineering.uiowa.edu/~expeng/equipment/HP_E3620A_manual.pdf

I find it interesting that the two outputs have a different preregulator setup. Maybe they stole the extra winding to power the display or maybe it was just decreed a little extra dissipation was ok on one channel. If I were building a clone I think I'd make them both the same.