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Variable Power Supply 0-25V/0-2.5A With LCD and Button Control


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I'm just getting back into electronics after about 15 years, just getting into Eagle, and am looking to build a "fairly straightforward" power supply, and I came across this power supply on Felixls for a variable 0-25V/0-2.5A power supply with an LCD readout and button controls.  The site is in Spanish, but I have translated it and have included the theory below.  I been reading the 0-30V Stabilized Power thread here on Electronics Lab, but this power supply is really all I need.   My questions are:

1.  This power supply seem to be "fairly" straightforward.  Is it a decent design (not underpowerd/won't overheat, ect)?
2.  I have made the schematics and boards in Eagle (I've included the eagle zip and also the pdfs).  Can somebody take a look at it and make sure I have done everything right?  Are my routes wide enough?  Where can I put ratsnests?  The boards are doublesided, and since I will be doing the "make-your-own-board-with-toner" method, I was thinking about making 2 single-sided boards and then put them together to make the double-sided board.

Any suggestions much appreciated.

Site Link:  http://translate.googleusercontent.com/translate_c?act=url&hl=en&ie=UTF8&prev=_t&rurl=translate.google.com&sl=auto&tl=en&u=http://sergiols.blogspot.com/search/label/Digital-Power-Supply&usg=ALkJrhjkal1Ctp4N19PuSq4wsLhHFwWDgA

This project is based on changes in Valdorros Osvaldo (see forum thread TodoPic ) to the power supply elektor magazine's number 260.

The source has the following characteristics



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1) How do we know what your requirements are?
2) It's better, cheaper and easier to just use double sided copper clad board in the first place rather than bodging a double sided PCB from two single sided PCBs.

The main problem I can see with the circuit is the peak voltage from the rectifier exceeds the maximum voltage rating of the LM324. The MC33074 is a better choice as it's rated to 44V but it has a higher roll-off and a different gain/phase shift so you may need to change some of the capacitor vales in the feedback loop.

I haven't analysed it in detail so there could be other problems.

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