how can i connect I F?

[new life]

in fm circuirt we use variable capacitor and variable inductance to control the frequancy

but when i connect the circuit there was two broplem i face

1* i didn't find variable inductance
so i get it from an old radio

2* but i didn't know how i connect it
it has four legs but i'll use as circuit three only

if anybody know about the matter plz help me

 

[gunsuresh]

Generally we use a fixed inductor and a variable capacitor in FM tuner circuits.