I'm trying to provide a 3.3V source for my micro controller from a 5V power supply, however seem to be having issues with all the 3.3V regulators I've tried.
I'm currently trying to use an MT1117-3.3, datasheet here.
When I turn on my 5V supply, the output I get from the regulator is 4.1V and 4.5V if I remove the load.
I tried an L78L, which gives a similar result althoguh apparently this requires 5.3V to regulate.
I've also tried an LM2931A which also gives a similar result although it's input voltage requirement is less than 5v.
Would appreciate any suggestions on what might be the problem. Diagram below.