:: I think Gary's suggestion is probably right. :: :: Errata is here: :: http://sites.google.com/site/cottersayre/errata Thanks for the link, I had tried to get to the errata site listed in the bo= ok, but it just timed out. I thought as Gary did, but then decided, I should really make sure! That still leaves the weird reference to nanohenries of capacitance and tha= t doesn't appear in the errata. Colin -- cdb, colin@btech-online.co.uk on 25/08/2010 =20 Web presence: www.btech-online.co.uk =20 =20 Hosted by: www.1and1.co.uk/?k_id=3D7988359 =20 =20 =20 =20 =20 =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .