Another thought: perhaps you could give this feedback of yours to ST? It might save some unwary person a lot of grief. On Fri, Jun 21, 2013 at 12:19 AM, Sean Breheny wrote: > Hi Colin, > > I think that they intend that ground symbol to mean local, PCB reference, > not earth ground, although they ARE using an earth ground symbol, which i= s > indeed misleading. Perhaps even worse, it would work if you connected ear= th > ground instead of neutral to that node, but it would then create a shock > hazard in some cases. > > Sean > > > > On Thu, Jun 20, 2013 at 9:58 PM, cdb wrote: > >> Trolling the internet for some TRIAC info, one link led to this >> application note by ST dated 2000. >> >> It appears to me that the schematic labels neutral/return with an earth >> symbol, which seems to me to be misleading to the unwary. The circuit is >> designed to be at mains potential. >> >> http://www.ie.itcr.ac.cr/rsoto/hojas%20de%20datos/SGS/7284.PDF >> >> As an aside the schematic layout probably wouldn't meet some Pic listers >> current or ex drawing ideals. >> >> Colin >> >> -- >> cdb, 21/06/2013 >> >> -- >> >> >> >> >> colin@btech-online.co.uk >> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .