Transistor CCS resistor value calculation.

[Diabolical Artificer]

Thanks again Mark, much appreciated as I know your busy. My self taught electronics gets into trouble when getting to the nitty gritty of how electronic circuits work. I've had a look on Youtube at several lectures and video's where circuits are broken down in voltage/current sources etc, but these are often accompanied by some scary maths; lots of long equations. As my maths is basic I can't follow said video's.

Lots to think about, thanks again, Andy.