Hi, Dave I did quite a while ago.. It was surely worthwhile, specially for the power circuits all made with discrete components. Very nice information that is hard to find anywhere else. I did not renew because I did not see much "renovation" on the information. Best regards, Alexandre Guimaraes > Often wondered, > Has anyone here become a "subscriber" of 4QDtec and did they consider it > worthwhile? > > Dave -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist