Rallyfinnen why dont you try the recommended component ( BT151 ) to see if that works first, that n channel is a Mosfet is it not and we use a SCR


Hi John i made your power board up last night but used my bobbin coil, i get a good spark across the cap ,

but i dont here the bobbin oscillate.......is it the low voltage i tested at......or maybe my battery was nearly dead


Brett