At89s51

http://www.atmel.com/dyn/resources/Prod_documents/doc2487.pdf

ULN2803

http://www.datasheetcatalog.org/datasheet/motorola/ULN2804A.pdf

7805
http://www.datasheetcatalog.org/datasheets/228/390068_DS.pdf

BC328

http://www.datasheetcatalog.org/datasheet/fairchild/BC328.pdf