Thanks for the simulation. I've been a bit quiet since posting the initial query as my head's been a bit cloudy due to a leg infection courtesy of a mishap at work last week :-/


The 'load' will be either 24v at 4K or 10K, or 12V at 10K.

I need to decide on components, as I probably have enough surplus parts. I think I've probably got suitable SMD resistors, LEDs, and either transistors or mosfets, but I need to dig through the collection and see exactly what I have and if it'll work.