oui33

Hello my friends!!! I am looking for a circuit which can control advices using a pc and optical fibre. Do you have anything in mind? PC-RS232-OPTICAL FIBRE-RELAY. I HAVE FOUND THIS: www.ias.ac.in/sadhana/Pdf2005Aug/PE1136.pdf THANK YOU!

hello!! i would like to help me!! (my english are not good.) 1.why we prefer the 3phase systems to produce energy and not the 2phase??? 2.which are the differences between them??