Quote: Originally Posted by .:tuxianer:. /img/forum/go_quote.gif Ok. I think I will take the standard parts. Is ther any final schematic? And wich version sounds better? I or II? And what's this: IMG The red circled section of that image is TREAD like power supply. I think this is thedoctor's board, and the section is optional. He did it that way because that is simply better in terms of stability. I think you should start with standard parts and standard layout just as the way sijosae did. It is not like I do not want you to be creative, but I think his layout is very carefully designed one, vey clever layout that did not take up whole lot of space. He is not only an expert at electonics but also at miniaturation too. Which is better I or II... that is good question. They are basically similiar things with different idea. I do not think one is better than the other though, I found I like "I" more than "II". Just for your Information, one comment on the power section of his layout, as you can see, there are 4 transitors. 1 pair of transitor close to the power source are... not really working like transistors, since their leads are connected. They are working just like diodes. So, you can replace it with diodes, 1N917 or 1N4148 type. In fact I highly recommend you do that, because in that way you don't have to worry about things like TR hfe matching. Sijosae himself once stated that he originally designed it with diodes but used TRs as alternative because he did not have diodes at hand when he made his.