Yes, I thought the same about Cf, that together with R1&R2 could shift the phase far enough that circuit will not work properly. On Sat, May 14, 2011 at 00:35, Brent Brown wrote= : > Interesting circuit, but capacitor Cf seems out of place at 150uF. Voltag= e not given, > but that would be exceptionally large physically in something suitable fo= r AC mains. > Not mentioned in the circuit description, I would hazard a guess that som= ething > more like say 150nF was intended. > > On 13 May 2011 at 10:55, KPL wrote: > >> Wow, trying different search strings in google gave me exactly what I wa= nted: >> http://www.edn-europe.com/improvedoptocouplercircuitsreducecurrentdrawre= sistledaging+article+2021+Europe.html >> >> circuit: http://www.edn-europe.com/cmsimages/0208/46f2.jpg >> It's basically same idea that I had imagined, but never got to try. >> > -- > Brent Brown, Electronic Design Solutions > 16 English Street, St Andrews, > Hamilton 3200, New Zealand > Ph: +64 7 849 0069 > Fax: +64 7 849 0071 > Cell: +64 27 433 4069 > eMail: =A0brent.brown@clear.net.nz > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 KPL --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .