Quote Originally Posted by Doddy View Post
The 24 Supply will tolerate 12-24V. All that supply is used for is the bias to the optocouplers on the isolated inputs, and the feed to the high-side of the (low-side) switched (MOSFET) outputs. The actual voltage is largely irrelevant (you'll get less current through the LEDs on the isolated inputs.... but they'll switch reliably). My personal view, and I'm ready to be corrected, with the isolated inputs that there's enough immunity introduced to not warrant a separate 24V supply and given space constraints and pre-existing 12V supply - I'd use the 12V supply. You know how the wobbly-wobblies work, Kitwn, let you come to your own conclusion.
Thanks for the info Doddy.

I was having the wobbly-wobblies about spending all this cash on a new controller and having all the same problems again! As I now live within a five minute drive and an overnight ferry's journey of where all the Australian stock of eBay products is kept I might test it all with the existing 12V supply and only order a 24v unit if there are any problems. I must get out of the mindset that everything takes 2 weeks to arrive by post from within the same country and so pre-emptive purchases are required for getting anything done.

Kit