want to build my own power supply with pot ajustments

ohh wow thats horrid lol.... yeah thats no good for what i want to do .. that would some what act like a heating element then ans just run the electric bill up with power your not using then right ?

yeah i know nothing about this switching supply thing do you have and urls that you think i should read i tried to find some info for basic pcb circuit use but have only found some silcon looking chips they say are switching with like 5 to 6 pins ... maybe like was suggested earlier in this topic i should find a cheap already made foreign switching regulator and build my supply around it and maybe i can hack it for adjusting i was hopeing that this would turn up a simple answer to the lm 317 design not haveing to learn something al over again ahhaha.... jokeing learning is half the fun !

ok so i found this would this be what you are refuring to and with with the better efficiency

this was on ebay i think this one says its still like effeciency is based of the current resistance so eaither its still linner or i have no idea what part number i should look for lol..

1st :
http://www.ebay.com/itm/2-Set-LM2596-3A-Step-Down-ADJ-Switching-Regulator-KIT-H-US3-/190652514828?pt=BI_Electrical_Equipment_Tools&hash=item2c63c6820c

2nd:
http://www.ebay.com/itm/LM2677-5-Amp-Integrated-Switching-Regulator-2-40V-/170633779086?pt=LH_DefaultDomain_0&hash=item27ba90d78e

let me know if im still headed in the wrong direction