Hi Eric,
Well looks like I can almost get cracking. Just another couple of questions.
Firstly do I need a current limiter on the low side at all? I hardly ever use the pos and neg together(with CT) so if I use just the pos to CT then it would limit it ok and if I used pos to neg without the CT then wouldn't the high side reg be enough to limit the current? I'm thinking that even from pos to neg it could only use the limit set by the high side reg?
Also is it viable to use a 317 on the 5v line the same as in the pos variable on the schematic? It would be handy to have the limiter on the 5v line too. I have more 12 way switches!
And finally, would you be kind enough to choose me an op-amp from the ones I have? I don't know enough about them to be honest and would hate to make the wrong decision.
LM107H, LM358N, ZN416, UA741, LM748, LT1101, LM1458DP, MC11458 AND NE5534P.
Thanks again Eric, maybe one day I will finish a project without you but I'm not holding my breath!
Al