Thanks David.
It may be useful to someone or it may provide ideas to someone else.
In any case the design has it's pros & cons but principally it's cheap and easy to understand & make.
I am looking at a 6 channel version as the cct is easily scalable to a bigger version. This would suit even the most ardent user. But, I get the impression that if I go this far then maybe AVR controlled (like
hikerbob's Arduino) would be a better idea.
I also meant to ask..if you have suggestions cct change ideas..or such like please feel free to speak up.