Some people have a remarkable knack for appearing to be polite while being extremely aggravating. His suggestions were pointedly contrary to what I asked - and some of them were just plain wrong. I asked if anyone had a favourite circuit they were willing to share and he launched into a tirade of irrelevant detail that was pretty much opposite to anything useful - I did pretty well to remain polite as long as I did!I think Dennis was way too polite. You came here and asked if anyone had favorite circuit to solve your problem. You failed to provide many of the requested details. It appears to me that you already had a solution and were just here hoping that people would see how "smart" you are.
Thanks for wasting all our time.
Actually I can't decide whether he's a troll or seriously dense.
After a lot of searching, I found a circuit that will do, its not of my own making, but looking at it I wondered why I didn't think of that - its in an ebook published for novices - so I'll let you draw your own conclusions from the fact no one here could suggest anything relevant.