Just found this in the CPC magazine i get, 
http://cpc.farnell.com/images/en_CC/T4B_28Jun08.pdfhttp://cpc.farnell.com/images/en_CC/T4B_28Jun08.pdf
page 62
might be of use to someone....
					http://cpc.farnell.com/images/en_CC/T4B_28Jun08.pdfhttp://cpc.farnell.com/images/en_CC/T4B_28Jun08.pdf
page 62
might be of use to someone....


 
 
Comment