Accuracy of a 15v rail

[TomGeorge]

Hi, @baffled2023

@baffled2023

The problem is, the circuit further down the line does division calculations using this 15v rail.

Then there must be a calibration feature, as not all 15V power rails will be exactly 15.00Vdc

@baffled2023

So I just changed the 11.3k to an 11.5k and got 15.04v. So this looks like a winner.

You should do some Ohms Law and work out what value a 2 resistors and a low value trim potentiometer will be to make the output adjustable over a small range to cal 15Vdc.

Tom....