Afternoon all,
Late on a Friday, I am clearly making some sort of simple error but I am blind to it.
Please see the circuit below. I have soldered it up and it isn't working. I get 36VDC on what should be the regulated 12V rail and a little over 1VDC on the 5VDC rail.
Any ideas, please? I should add that if I remove the transformer and supply 18VDC from my bench PSU then everything works fine, even after the 36V spike which is over the LT3501 max so I *think* the regulator is fine.
The number above the transformer is a UK Farnell product code. It is a 2x 9V transformer with the secondaries wired in series to give 18V.
Cheers,
Simon
PS: Context; it is a power supply for a rPi which is controlling, among other things, some 12V RGB LEDs.
