2 x FT-240-43 toroids and 18 gauge stranded wirefriction tapestack the toroidswrap toroids togetherwrapped toroidsmeasure first three wraps with stringcut measured length for first 3 wrapswrap first three wraps with primary and secondary wires togethercontinue with secondary until first tapstrip end of 6th wrap for first tapcutting one pass through toroid to pre-measured markstrip and twist together end of 6th wrap and beginning of 7thdo the same with each successive wrap36 total wraps, wrap #’s 6-36 tappedsolder on connector and all twisted wire connections
