Hi! I already posted some but just want say thanks for all advising and for hokke book. It's the best one forum for thats kind of stuff!!! Im new in refining. So im experienced electronics technologist (15 years) and i having almost finis reading hokke book. If you have any question about electronics ill be happy to helps. (Every process in electronics work the same but whit different use)... So it a good place to learn thanks. "My english have some work to do but ill survive".