rehanessa

Hi Audioguru In the second paragraph, you have said something about

hi audioguru i agree with your first sentence that the two supples shall have separate winding (someone else also told me this). could you tell why it is necessary to have two supplies utililzing two different windings and what would be the consequences if i use a common winding??? but, i dont agree with the last sentence of your reply that a center tapped trans could be used for this purpose, otherwise ic manufacturers would not have been manufacturing negative regulators like lm337.

i have two positive supplies made using lm317. if i short the positive terminal of one supply with the negative terminal of the other supply and treat this terminal as common ground. then will i get complementay outputs (ie positive and negative") from remaining two terminals??????? ie have i converted two positive supplies into a dual supply???????

555 timer is a very cheap and easily available timer/clock ic. i designed a digital clock with it and it worked very well.

now i wish to replace lm317 by lm338(5A max current ) and modify the circuit for 5A peak current. now what would happen to the 2200uf capacitor. there should be some formula,calculations etc to evaluate the correct value of this capacitor. also i could not understand what you mean by "self oscillating in regulator" can you please clear it for me?

in the design 2200uf capacitor has been used. is there any specific reason for that? Any calculation to justify this value?what will be the effect on circuit if i make it say 100u secondly, two of the three capacitors used in the design are electrolytic while one is not. why so? Project Link: http://www.electronics-lab.com/projects/power/010/index.html