I used to have a circuit for a blocking oscilator that I used to change 12v to120 with a transformer,but I lost it. This is the closest circuit that I could find. I have tried different values of resister and capacitor to resonate with the transformer but I can't get it to go. Can someone suggest values that would work? I don't have a meter to measure the inductance of the primary of the transformer. It is an aproximently 2 amp transformer.