Just a quick update:
I've gone a bought two daul-gang pots so finally I can now test the design for forwards AND backwards with full proportionality (emulation of course). These pots have a "centre-click" feature which will be usefull when calibrating them later..
Also, I went to buy some opto-couplers from Jaycar but the @#$% closed before I could get there
, so I'm gonna have to wait on that.....
So Modjo and Efarel please be patient, I will have this finalised during the next few days and I'll update the schematic with the correct values soon....
cheers,
ph2t.