I'm building a standard LM317 supply for testing/general use:
Image source: ElecCircuit - Variable power supply using LM317
The datasheet states the output cap (C3) is not needed for stability, so I will omit it. I have also read low ESR caps for C3 can cause instability. So what happens if this supply is eventually connected to something with large and/or low ESR caps on its power input?
Won't those caps just act like C3 in the circuit and be liable to cause instability?
Will using a high ESR cap for C3, instead of omitting it, help prevent instability caused by whatever is connected to the supply?
If not, how is this dealt with?