stuee

I have a 12v transformer for interior lights and a few lights for it, but want to make it a dimmer light. the working amps are 250mA.

I would like to know how to wire up these three ways, so i can try each one and see if its any good and use the best....

Touch lamp. touch the metal to turn on dimmest. press again for brighter and again for brighter and again for off.

Manual pot adjuster.

and digital potentimeter. press up to turn up and make brighter and down for darker / off, and a reset button to turn instant off.

Any help and sche... will be helpfull.
Thanks in advance