Sob Sob, Pete tried everything you had guided, changed zener to 10V and then 13V and also R4 to 5K Vario, but alas seems lady luck aint happy with me at all, now if I connect the 10V zener voltage drops down to 11.96, and with the 13V zener nothing happens, if I change the preset(adjust) then nothing for 13v zener but in 10V zener fluctuates only a bit from 11.88 to 11.96, which I guess is not suffice. What do I do now and is there any other way to contact you via mail or somethng