re:12v relay on 3v ??

thank you all dear friends :)
i have made the transistor - relay circuit , it is working very good
:)
but there is a small problem , i wanted to adjust the relay open
volt.
i mean that i need to make the relay open on 3v or 2.5 etc.
i got a 100k variable risitor but it BURNED because of the rela
current.
what is the best way to make the open voltage for the relay variable.
i mean to control the 3v or less , where should i put the variable
risitor.

thank you very very very much for helping me , and sorry may be i am
confused cuz i am still biginner ;)

.

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