I have a couple of 12V LEDs lying around, and some old 220V to DC 12V transformers. I want to build a little portable lamp.
The LEDs flicker: I guess the transformers are not delivering a constant voltage. Now, of course I could get a LED 12V driver for a couple of bucks, but that would not be sportsmanlike. Is there any common trick / simple solution, like adding a smoothing capacitor or such like?