I have designed the schematic below, wanting to build a simple power supply for a project. Problem is, the LT3080 is outputting around 15V no matter what R1 I use.
Trying to find the root cause, I have removed all components following the LT3080 (except for R1), but to no avail.
I am measuring 11Vac across the transformer (it is rated 7.5V @ 1.5VA) and 15Vdc across the bridge. Measuring the tab of the LT3080 gives 14.7V (same voltage if I measure across C4. All of this with a 470kO R1... which if I'm not mistaken should output 4.7V
Can anyone shed some light on this?